Composites Science and Technology最新文献_第2页

Stabilizing free radical crosslinked dielectric polymers with metal-organic frameworks: An efficient approach to mitigating dielectric deterioration

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-02-19 DOI: 10.1016/j.compscitech.2025.111109

Zeru Wang , Xie Wang , Hanxue Ren , Xiaotao Zhu , Zeming Fang , Qianfa Liu , Ke Wang

The rise of 5G and 6G technologies has heightened the demand for ultra-low dielectric loss thermosetting composites in advanced electronics. A significant challenge is dielectric degradation at elevated temperatures, primarily due to increased molecular polarizability from thermal aging. Traditional stabilization strategies are ineffective because of their incompatibility with free radical cross-linking reactions and their negative impact on dielectric performance. This study incorporates UiO-66, a metal-organic framework, into thermosetting polyphenylene oxide/1,2-polybutadiene systems, yielding composites with enhanced oxidation resistance and dielectric stability without impeding cross-linking. After 14 days of aging at 150 °C, the UiO-66-modified composite exhibited exceptional dielectric stability, with its dielectric loss increasing to only one-sixth compared to the unmodified system. Fourier-transform infrared and X-ray photoelectron spectroscopy analyses indicate that UiO-66 mitigates the oxidation of unreacted double bonds and delays the formation of C–O and CO groups. These improvements are attributed to UiO-66's exceptional oxygen/ozone adsorption capabilities, along with its free radical quenching abilities, facilitated by its high surface area, porous structure, and abundant open metal sites, confirmed by electron paramagnetic resonance and density functional theory analyses. Furthermore, UiO-66 reduces thermal expansion and increases modulus. This study opens a new avenue for designing and developing high-performance electronic materials with customizable structures and properties.

{"title":"Stabilizing free radical crosslinked dielectric polymers with metal-organic frameworks: An efficient approach to mitigating dielectric deterioration","authors":"Zeru Wang , Xie Wang , Hanxue Ren , Xiaotao Zhu , Zeming Fang , Qianfa Liu , Ke Wang","doi":"10.1016/j.compscitech.2025.111109","DOIUrl":"10.1016/j.compscitech.2025.111109","url":null,"abstract":"<div><div>The rise of 5G and 6G technologies has heightened the demand for ultra-low dielectric loss thermosetting composites in advanced electronics. A significant challenge is dielectric degradation at elevated temperatures, primarily due to increased molecular polarizability from thermal aging. Traditional stabilization strategies are ineffective because of their incompatibility with free radical cross-linking reactions and their negative impact on dielectric performance. This study incorporates UiO-66, a metal-organic framework, into thermosetting polyphenylene oxide/1,2-polybutadiene systems, yielding composites with enhanced oxidation resistance and dielectric stability without impeding cross-linking. After 14 days of aging at 150 °C, the UiO-66-modified composite exhibited exceptional dielectric stability, with its dielectric loss increasing to only one-sixth compared to the unmodified system. Fourier-transform infrared and X-ray photoelectron spectroscopy analyses indicate that UiO-66 mitigates the oxidation of unreacted double bonds and delays the formation of C–O and C<img>O groups. These improvements are attributed to UiO-66's exceptional oxygen/ozone adsorption capabilities, along with its free radical quenching abilities, facilitated by its high surface area, porous structure, and abundant open metal sites, confirmed by electron paramagnetic resonance and density functional theory analyses. Furthermore, UiO-66 reduces thermal expansion and increases modulus. This study opens a new avenue for designing and developing high-performance electronic materials with customizable structures and properties.</div></div>","PeriodicalId":283,"journal":{"name":"Composites Science and Technology","volume":"264 ","pages":"Article 111109"},"PeriodicalIF":8.3,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Broadband strong absorption in lightweight metastructure via multiscale modulation

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-02-19 DOI: 10.1016/j.compscitech.2025.111110

Kai Cui, Lei Zheng, Lili Wu, Tao Wang, Xian Wang, Rongzhou Gong

Designing and fabricating an advanced metastructure absorber (MA) with lightweight, broadband, and high absorption efficiency is a promising solution to the growing electromagnetic (EM) pollution issue. Herein, the nano-graphite (NG)/polyamide 12 (PA12) composite filaments were fabricated using hot-melting processing, with the dispersion of NG particles in PA12 controlled by varying machining times. Analytical results revealed that improved dispersion of NG particles in the PA12 matrix significantly enhances the EM loss capability of the composite filaments, primarily due to increased conductive paths and interfacial contact area. Subsequently, a multilayer honeycomb structure with a bi-gradient material-structure was developed to improve the impedance matching of carbon-based composites. Simulations revealed that the proposed MA achieved a reflection loss (RL) below −10 dB in the 2–18 GHz with a relative bandwidth of up to 160 %, and exhibited a strong RL below −20 dB in the 4.2–18 GHz range. Finally, the MA was fabricated using 3D printing technology and demonstrated excellent agreement between the experimental RL and simulation results. Importantly, this research offers new insights into the modulation of EM property in carbon-based composite filaments and the design of MA with integrated broadband and high efficiency.

{"title":"Broadband strong absorption in lightweight metastructure via multiscale modulation","authors":"Kai Cui, Lei Zheng, Lili Wu, Tao Wang, Xian Wang, Rongzhou Gong","doi":"10.1016/j.compscitech.2025.111110","DOIUrl":"10.1016/j.compscitech.2025.111110","url":null,"abstract":"<div><div>Designing and fabricating an advanced metastructure absorber (MA) with lightweight, broadband, and high absorption efficiency is a promising solution to the growing electromagnetic (EM) pollution issue. Herein, the nano-graphite (NG)/polyamide 12 (PA12) composite filaments were fabricated using hot-melting processing, with the dispersion of NG particles in PA12 controlled by varying machining times. Analytical results revealed that improved dispersion of NG particles in the PA12 matrix significantly enhances the EM loss capability of the composite filaments, primarily due to increased conductive paths and interfacial contact area. Subsequently, a multilayer honeycomb structure with a bi-gradient material-structure was developed to improve the impedance matching of carbon-based composites. Simulations revealed that the proposed MA achieved a reflection loss (RL) below −10 dB in the 2–18 GHz with a relative bandwidth of up to 160 %, and exhibited a strong RL below −20 dB in the 4.2–18 GHz range. Finally, the MA was fabricated using 3D printing technology and demonstrated excellent agreement between the experimental RL and simulation results. Importantly, this research offers new insights into the modulation of EM property in carbon-based composite filaments and the design of MA with integrated broadband and high efficiency.</div></div>","PeriodicalId":283,"journal":{"name":"Composites Science and Technology","volume":"264 ","pages":"Article 111110"},"PeriodicalIF":8.3,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tree-inspired bio-composites with 3D anisotropic thermal and electrical conductivities prepared by parallel-engineered graphene integration

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-02-19 DOI: 10.1016/j.compscitech.2025.111112

Jin Guo , Zhengbin He , Rongjun Wei , Jingjing Gao , Runan Gao , Zhenyu Wang , Songlin Yi

In nature, numerous bio-materials exhibit anisotropic physical and chemical properties, attributable to their distinctive microstructural characteristics. Inspired by this, artificial composites can be meticulously designed to replicate such anisotropic behavior and attain targeted properties. Here, we successfully constructed wood/graphene bio-composites with parallel-aligned graphene structures by a synergistic process of electrostatic self-assembly and densification using delignified wood as a template. Through the design of parallel-arranged graphene structures, the modulation of phonon and electron transport paths is achieved and differentiated propagation properties are exhibited along different directions. This structural arrangement endows the bio-composites with unique 3D orthogonal anisotropic thermal and electrical conductivity properties. Specifically, the bio-composites integrated with 0.5 wt% graphene demonstrated thermal conductivity of 0.77, 0.25, and 0.12 W/m·K⁻¹ in the x, y, and z directions, respectively, representing a significant enhancement of 2.1–11.8 times over that of natural wood. Concurrently, the electrical conductivity in different directions was markedly improved from 10⁻¹² to 10⁻⁴-10⁰ S/cm. Furthermore, the bio-composites showcased superior tensile strength, reaching up to 79.1 MPa, along with notable flame-retardant properties. In Summary, this research provides a pioneering strategy for the preparation of composites with 3D orthogonal anisotropic thermal and electrical properties, a functionality that enables them to be used for thermal management applications such as thermal insulation and heat dissipation.

{"title":"Tree-inspired bio-composites with 3D anisotropic thermal and electrical conductivities prepared by parallel-engineered graphene integration","authors":"Jin Guo , Zhengbin He , Rongjun Wei , Jingjing Gao , Runan Gao , Zhenyu Wang , Songlin Yi","doi":"10.1016/j.compscitech.2025.111112","DOIUrl":"10.1016/j.compscitech.2025.111112","url":null,"abstract":"<div><div>In nature, numerous bio-materials exhibit anisotropic physical and chemical properties, attributable to their distinctive microstructural characteristics. Inspired by this, artificial composites can be meticulously designed to replicate such anisotropic behavior and attain targeted properties. Here, we successfully constructed wood/graphene bio-composites with parallel-aligned graphene structures by a synergistic process of electrostatic self-assembly and densification using delignified wood as a template. Through the design of parallel-arranged graphene structures, the modulation of phonon and electron transport paths is achieved and differentiated propagation properties are exhibited along different directions. This structural arrangement endows the bio-composites with unique 3D orthogonal anisotropic thermal and electrical conductivity properties. Specifically, the bio-composites integrated with 0.5 wt% graphene demonstrated thermal conductivity of 0.77, 0.25, and 0.12 W/m·K<sup>−1</sup> in the x, y, and z directions, respectively, representing a significant enhancement of 2.1–11.8 times over that of natural wood. Concurrently, the electrical conductivity in different directions was markedly improved from 10<sup>−12</sup> to 10<sup>−4</sup>-10<sup>0</sup> S/cm. Furthermore, the bio-composites showcased superior tensile strength, reaching up to 79.1 MPa, along with notable flame-retardant properties. In Summary, this research provides a pioneering strategy for the preparation of composites with 3D orthogonal anisotropic thermal and electrical properties, a functionality that enables them to be used for thermal management applications such as thermal insulation and heat dissipation.</div></div>","PeriodicalId":283,"journal":{"name":"Composites Science and Technology","volume":"264 ","pages":"Article 111112"},"PeriodicalIF":8.3,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Renewable superhydrophobic antifouling composite silicone based on micro-nano structure

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-02-19 DOI: 10.1016/j.compscitech.2025.111111

Dong Tian , Kaiming Zhang , Lixin Sun , Zhihao Rong , Dejin Zhang , Lei Liu , Yahui Wu , Chuanhui Gao , Ze Kan , Yuetao Liu

The development of silicone-based superhydrophobic coatings is highly desirable for antifouling applications. However, achieving durable coatings remains challenging. Superhydrophobicity is often lost after mechanical damage or microorganism penetration, which compromises the static antifouling ability. Herein, we propose a straightforward strategy for fabricating a silicone coating (F-PIBO-40 %) based on a simple condensation reaction between a novel silane telomer (F-PIBO) and α,ω-dihydroxypolydimethylsiloxane (PDMS). Moreover, nano-sized silica particles (SiO₂) were uniformly incorporated to construct micro-nano rough structures and enhance the durability. The mechanical and environmental durability, self-cleaning, antibacterial and anti-diatom performance were comprehensively characterized. The results revealed that even after 400 damage cycles (8000 cm of wear), the contact angle remained above 165°. The superhydrophobic surface could be simply renewed through friction, minimizing the cost of use and replacement. Furthermore, the coating retained its superhydrophobic properties after exposure to UV radiation, hot/cold temperature cycling, and immersion in various polar and non-polar solvents. The synergistic effects of the isobornyl groups and the superhydrophobicity contributed to the excellent self-cleaning, antibacterial, and anti-diatom performance. We believe that this work provides a new approach for the preparation of multi-environmentally reliable, durable, and surface-renewable superhydrophobic antifouling coatings.

{"title":"Renewable superhydrophobic antifouling composite silicone based on micro-nano structure","authors":"Dong Tian , Kaiming Zhang , Lixin Sun , Zhihao Rong , Dejin Zhang , Lei Liu , Yahui Wu , Chuanhui Gao , Ze Kan , Yuetao Liu","doi":"10.1016/j.compscitech.2025.111111","DOIUrl":"10.1016/j.compscitech.2025.111111","url":null,"abstract":"<div><div>The development of silicone-based superhydrophobic coatings is highly desirable for antifouling applications. However, achieving durable coatings remains challenging. Superhydrophobicity is often lost after mechanical damage or microorganism penetration, which compromises the static antifouling ability. Herein, we propose a straightforward strategy for fabricating a silicone coating (F-PIBO-40 %) based on a simple condensation reaction between a novel silane telomer (F-PIBO) and α,ω-dihydroxypolydimethylsiloxane (PDMS). Moreover, nano-sized silica particles (SiO<sub>2</sub>) were uniformly incorporated to construct micro-nano rough structures and enhance the durability. The mechanical and environmental durability, self-cleaning, antibacterial and anti-diatom performance were comprehensively characterized. The results revealed that even after 400 damage cycles (8000 cm of wear), the contact angle remained above 165°. The superhydrophobic surface could be simply renewed through friction, minimizing the cost of use and replacement. Furthermore, the coating retained its superhydrophobic properties after exposure to UV radiation, hot/cold temperature cycling, and immersion in various polar and non-polar solvents. The synergistic effects of the isobornyl groups and the superhydrophobicity contributed to the excellent self-cleaning, antibacterial, and anti-diatom performance. We believe that this work provides a new approach for the preparation of multi-environmentally reliable, durable, and surface-renewable superhydrophobic antifouling coatings.</div></div>","PeriodicalId":283,"journal":{"name":"Composites Science and Technology","volume":"264 ","pages":"Article 111111"},"PeriodicalIF":8.3,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flexible triple-layer graphene composites for broadband high-absorption electromagnetic shielding

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-02-14 DOI: 10.1016/j.compscitech.2025.111108

Mehran Ashouri-Sanjani , Reza Rahmati , Mahdi Hamidinejad , Chul B. Park

Electromagnetic interference (EMI) presents significant challenges in today's electronics, disrupting device performance and posing health risks. We introduce a novel flexible composite with exceptional EMI shielding effectiveness and absorption-dominated performance across the Ku-band (12.4–18 GHz). The composite features a strategically engineered triple-layer architecture: two layers of reduced graphene oxide (rGO) aerogels with aligned porosities and a dense rGO film, all embedded within a polydimethylsiloxane (PDMS) matrix. This design achieves an outstanding average absorptivity of 95.4 % and a total shielding effectiveness of 42.6 dB within a minimal thickness of 2.5 mm. The superior performance arises from meticulous tuning of each layer's electrical conductivity, optimizing impedance matching and enhancing electromagnetic absorption through multiple reflection and scattering mechanisms. Finite element method simulations elucidate the electromagnetic interactions within the multilayer structure, confirming the effectiveness of our design. This work pioneers the development of next-generation EMI shielding materials that synergistically combine high absorptivity, mechanical flexibility, and robust performance, meeting the demanding requirements of modern electronics.

{"title":"Flexible triple-layer graphene composites for broadband high-absorption electromagnetic shielding","authors":"Mehran Ashouri-Sanjani , Reza Rahmati , Mahdi Hamidinejad , Chul B. Park","doi":"10.1016/j.compscitech.2025.111108","DOIUrl":"10.1016/j.compscitech.2025.111108","url":null,"abstract":"<div><div>Electromagnetic interference (EMI) presents significant challenges in today's electronics, disrupting device performance and posing health risks. We introduce a novel flexible composite with exceptional EMI shielding effectiveness and absorption-dominated performance across the Ku-band (12.4–18 GHz). The composite features a strategically engineered triple-layer architecture: two layers of reduced graphene oxide (rGO) aerogels with aligned porosities and a dense rGO film, all embedded within a polydimethylsiloxane (PDMS) matrix. This design achieves an outstanding average absorptivity of 95.4 % and a total shielding effectiveness of 42.6 dB within a minimal thickness of 2.5 mm. The superior performance arises from meticulous tuning of each layer's electrical conductivity, optimizing impedance matching and enhancing electromagnetic absorption through multiple reflection and scattering mechanisms. Finite element method simulations elucidate the electromagnetic interactions within the multilayer structure, confirming the effectiveness of our design. This work pioneers the development of next-generation EMI shielding materials that synergistically combine high absorptivity, mechanical flexibility, and robust performance, meeting the demanding requirements of modern electronics.</div></div>","PeriodicalId":283,"journal":{"name":"Composites Science and Technology","volume":"263 ","pages":"Article 111108"},"PeriodicalIF":8.3,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143421397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Core-double shell Ba0.5Sr0.5TiO3@SiO2@Polyethylene imine nanoparticles with built-in electric field toward enhancing dielectric energy storage

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-02-13 DOI: 10.1016/j.compscitech.2025.111107

Zihao Guo , Zhihao Sun , Peng Wang , Jingyu Bi , Guangshen Li , Jianshu Wang , Ying Sha , Zhicheng Shi , Lei Qian

In this work, a negatively charged SiO₂ inner shell and a positively charged polyethylene imine (PEI) outer shell have coated onto a Ba_0.5Sr_0.5TiO₃ (BST) nanoparticle to fabricate core-double shell structure with a built-in electric field. This innovative structure is subsequently incorporated into poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) and polymethyl methacrylate (PMMA) hybrid organic matrix to prepare composite films with enhanced dielectric energy storage properties. The SiO₂ inner shell effectively mitigates the uneven electric field distribution caused by dielectric constant mismatch, and the PEI organic outer shell is designed to enhance the interfacial compatibility. Additionally, the dual shell structure exhibits a significant synergistic effect resulting from the built-in electric field, which successfully impedes the acceleration of internal charges and growth of electrical trees. COMSOL Multiphysics simulation results confirm that the core-double shell structure effectively alleviates the electric field distortion, leading to improved breakdown strength. Notably, the composite film demonstrates an energy storage density of 12.72 J/cm³ under an electric field of 498.96 kV/mm with a low loading of 0.5 wt%, achieving 1.98 times that of the pure matrix. These findings provide valuable insights and directions for advanced polymer-based composite dielectric films with high energy storage densities.

{"title":"Core-double shell Ba0.5Sr0.5TiO3@SiO2@Polyethylene imine nanoparticles with built-in electric field toward enhancing dielectric energy storage","authors":"Zihao Guo , Zhihao Sun , Peng Wang , Jingyu Bi , Guangshen Li , Jianshu Wang , Ying Sha , Zhicheng Shi , Lei Qian","doi":"10.1016/j.compscitech.2025.111107","DOIUrl":"10.1016/j.compscitech.2025.111107","url":null,"abstract":"<div><div>In this work, a negatively charged SiO<sub>2</sub> inner shell and a positively charged polyethylene imine (PEI) outer shell have coated onto a Ba<sub>0.5</sub>Sr<sub>0.5</sub>TiO<sub>3</sub> (BST) nanoparticle to fabricate core-double shell structure with a built-in electric field. This innovative structure is subsequently incorporated into poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) and polymethyl methacrylate (PMMA) hybrid organic matrix to prepare composite films with enhanced dielectric energy storage properties. The SiO<sub>2</sub> inner shell effectively mitigates the uneven electric field distribution caused by dielectric constant mismatch, and the PEI organic outer shell is designed to enhance the interfacial compatibility. Additionally, the dual shell structure exhibits a significant synergistic effect resulting from the built-in electric field, which successfully impedes the acceleration of internal charges and growth of electrical trees. COMSOL Multiphysics simulation results confirm that the core-double shell structure effectively alleviates the electric field distortion, leading to improved breakdown strength. Notably, the composite film demonstrates an energy storage density of 12.72 J/cm<sup>3</sup> under an electric field of 498.96 kV/mm with a low loading of 0.5 wt%, achieving 1.98 times that of the pure matrix. These findings provide valuable insights and directions for advanced polymer-based composite dielectric films with high energy storage densities.</div></div>","PeriodicalId":283,"journal":{"name":"Composites Science and Technology","volume":"264 ","pages":"Article 111107"},"PeriodicalIF":8.3,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bioinspired staggered diaphragm design of multi-cell thin-walled structures for enhancing compressive performance

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-02-10 DOI: 10.1016/j.compscitech.2025.111104

Qianbing Tan, Jin Wang, Yisen Liu, Guangyu Sun, Huijing Gao, Yong Peng, Song Yao, Kui Wang

Inspired by the stem of the bird-of-paradise plant, a group of novel multi-cell structures with staggered diaphragm arrangements were proposed to improve their energy absorption and load fluctuation. These structures were fabricated by the fused deposition modeling technique and made from chopped carbon-fiber-reinforced polyamide. The effects of the different staggered diaphragm arrangements (SDA1, SDA2 and SDA3) on the energy absorption characteristics and deformation behaviors of multi-cell structures were investigated by the axial compression tests. The results suggested that compared to the non-staggered diaphragm arrangement (NSDA), SDA3 showed a 30.085 % increase in the specific energy absorption (SEA) and a 45.674 % decrease in the undulation of load-carrying capacity (ULC). The mechanism analysis indicated that diaphragms limited the movement of thin walls at junctions between thin walls and diaphragms, promoting the formation of plastic hinges. The staggered diaphragm design created more junctions, contributing to additional plastic hinges for energy absorption. In addition, staggered diaphragms induced the peak response forces of thin wall separation, thereby decreasing load fluctuation. Based on mechanism analysis, the superposition method was carried out to analyze the fluctuation characteristics of response force curves. The comparisons between experimental and theoretical results presented that the method was an effective and accurate analysis way for 3D-printed multi-cell structures with diaphragms.

{"title":"Bioinspired staggered diaphragm design of multi-cell thin-walled structures for enhancing compressive performance","authors":"Qianbing Tan, Jin Wang, Yisen Liu, Guangyu Sun, Huijing Gao, Yong Peng, Song Yao, Kui Wang","doi":"10.1016/j.compscitech.2025.111104","DOIUrl":"10.1016/j.compscitech.2025.111104","url":null,"abstract":"<div><div>Inspired by the stem of the bird-of-paradise plant, a group of novel multi-cell structures with staggered diaphragm arrangements were proposed to improve their energy absorption and load fluctuation. These structures were fabricated by the fused deposition modeling technique and made from chopped carbon-fiber-reinforced polyamide. The effects of the different staggered diaphragm arrangements (SDA1, SDA2 and SDA3) on the energy absorption characteristics and deformation behaviors of multi-cell structures were investigated by the axial compression tests. The results suggested that compared to the non-staggered diaphragm arrangement (NSDA), SDA3 showed a 30.085 % increase in the specific energy absorption (SEA) and a 45.674 % decrease in the undulation of load-carrying capacity (ULC). The mechanism analysis indicated that diaphragms limited the movement of thin walls at junctions between thin walls and diaphragms, promoting the formation of plastic hinges. The staggered diaphragm design created more junctions, contributing to additional plastic hinges for energy absorption. In addition, staggered diaphragms induced the peak response forces of thin wall separation, thereby decreasing load fluctuation. Based on mechanism analysis, the superposition method was carried out to analyze the fluctuation characteristics of response force curves. The comparisons between experimental and theoretical results presented that the method was an effective and accurate analysis way for 3D-printed multi-cell structures with diaphragms.</div></div>","PeriodicalId":283,"journal":{"name":"Composites Science and Technology","volume":"263 ","pages":"Article 111104"},"PeriodicalIF":8.3,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Combining oriented ceramic skeleton and porous PDMS towards high performance flexible piezoelectric energy harvester

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-02-10 DOI: 10.1016/j.compscitech.2025.111103

Xiaosen Su, Weilin Liao, Fei Fang

Flexible piezoelectric energy harvesters (FPEHs) made of polymer-based piezoelectric composites are urgently needed for powering wearable electronics. Employing water-based freeze casting and emulsion-template method, a porous structured Barium titanate(BaTiO₃)/PDMS composite is obtained, which combines the piezoelectric ceramics with piezoelectric electret. For the BaTiO₃ ceramic skeletons, three different pore arrangements are obtained by utilizing flat-bottomed mold, wedge-shaped mold and round-table mold. The ceramic skeletons are then encapsulated with the PDMS matrix with and without porous forming ingredient. Finite element simulation is carried out to reveal the influence of the alignment of BaTiO₃ skeleton and porous PDMS on the piezoelectric behavior. The output performance is investigated for the BaTiO₃/PDMS composite upon a vibration exciter, as well as human motion. It is found that the BaTiO₃ skeleton with a scattered porous structure aligned in the horizontal direction, encapsulated with a porous PDMS possesses the most prominent output voltage and power, reaching 6.63 V and 26.46 μW, respectively upon a compressive load of 21 N at 8 Hz. Moreover, a smart insole based on the porous structured BaTiO₃/PDMS piezocomposites with both energy harvesting and posture recognition functions is constructed. The open-circuit voltage of the smart insole reachs 40 V in jumping states, and can successfully power an alarm clock. The study offers a new approach for designing of the flexible piezoelectric composites for applications in energy harvesting and posture recognition.

{"title":"Combining oriented ceramic skeleton and porous PDMS towards high performance flexible piezoelectric energy harvester","authors":"Xiaosen Su, Weilin Liao, Fei Fang","doi":"10.1016/j.compscitech.2025.111103","DOIUrl":"10.1016/j.compscitech.2025.111103","url":null,"abstract":"<div><div>Flexible piezoelectric energy harvesters (FPEHs) made of polymer-based piezoelectric composites are urgently needed for powering wearable electronics. Employing water-based freeze casting and emulsion-template method, a porous structured Barium titanate(BaTiO<sub>3</sub>)/PDMS composite is obtained, which combines the piezoelectric ceramics with piezoelectric electret. For the BaTiO<sub>3</sub> ceramic skeletons, three different pore arrangements are obtained by utilizing flat-bottomed mold, wedge-shaped mold and round-table mold. The ceramic skeletons are then encapsulated with the PDMS matrix with and without porous forming ingredient. Finite element simulation is carried out to reveal the influence of the alignment of BaTiO<sub>3</sub> skeleton and porous PDMS on the piezoelectric behavior. The output performance is investigated for the BaTiO<sub>3</sub>/PDMS composite upon a vibration exciter, as well as human motion. It is found that the BaTiO<sub>3</sub> skeleton with a scattered porous structure aligned in the horizontal direction, encapsulated with a porous PDMS possesses the most prominent output voltage and power, reaching 6.63 V and 26.46 μW, respectively upon a compressive load of 21 N at 8 Hz. Moreover, a smart insole based on the porous structured BaTiO<sub>3</sub>/PDMS piezocomposites with both energy harvesting and posture recognition functions is constructed. The open-circuit voltage of the smart insole reachs 40 V in jumping states, and can successfully power an alarm clock. The study offers a new approach for designing of the flexible piezoelectric composites for applications in energy harvesting and posture recognition.</div></div>","PeriodicalId":283,"journal":{"name":"Composites Science and Technology","volume":"263 ","pages":"Article 111103"},"PeriodicalIF":8.3,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143421396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flexural properties of sandwich panels fabricated by filament-extrusion of high-temperature thermoplastic composites

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-02-10 DOI: 10.1016/j.compscitech.2025.111106

Dogan Arslan , Mihaela Mihai , Daniel Therriault , Martin Lévesque

This study investigated the flexural properties of sandwich panel structures fabricated by the filament-extrusion 3D printing technology using novel high-temperature thermoplastic polymer composites of polyetherimide (PEI) and polyphenylene sulfide (PPS). Various formulations of PEI and PPS composites, combined with recycled carbon fiber (rCF) and thermal black (TB) particles, were manufactured. The flexural properties were assessed through a three-point bending test, comparing the performance of sandwich panels printed with these filaments and those printed with commercially available filaments. Dimensional accuracy was evaluated using a 3D scanner, revealing that 90 % of scanned points deviated a maximum of 0.2 mm from the CAD model. X-ray micro-tomography measured porosity, finding up to ∼12 % in PEI and ∼8 % in PPS skins. The microstructural analysis of the composites revealed a level of adhesion deemed acceptable between successive layers of printed parts and adequate dimensional accuracy. A digital image correlation (DIC) system assessed full-field strain and crack propagation during flexural testing, showing crack initiation due to strain concentration in the core region, consistent across all specimens. The sandwich panels printed with developed filaments exhibited comparable flexural properties to that of panels printed with commercial filaments, with a bending load capacity of up to 3.0 kN for approximately 50 g specimens. The printing quality and mechanical performance of the novel PEI and PPS composite formulations demonstrated in this study suggested that they could serve as viable alternatives to commercial filaments.

{"title":"Flexural properties of sandwich panels fabricated by filament-extrusion of high-temperature thermoplastic composites","authors":"Dogan Arslan , Mihaela Mihai , Daniel Therriault , Martin Lévesque","doi":"10.1016/j.compscitech.2025.111106","DOIUrl":"10.1016/j.compscitech.2025.111106","url":null,"abstract":"<div><div>This study investigated the flexural properties of sandwich panel structures fabricated by the filament-extrusion 3D printing technology using novel high-temperature thermoplastic polymer composites of polyetherimide (PEI) and polyphenylene sulfide (PPS). Various formulations of PEI and PPS composites, combined with recycled carbon fiber (rCF) and thermal black (TB) particles, were manufactured. The flexural properties were assessed through a three-point bending test, comparing the performance of sandwich panels printed with these filaments and those printed with commercially available filaments. Dimensional accuracy was evaluated using a 3D scanner, revealing that 90 % of scanned points deviated a maximum of 0.2 mm from the CAD model. X-ray micro-tomography measured porosity, finding up to ∼12 % in PEI and ∼8 % in PPS skins. The microstructural analysis of the composites revealed a level of adhesion deemed acceptable between successive layers of printed parts and adequate dimensional accuracy. A digital image correlation (DIC) system assessed full-field strain and crack propagation during flexural testing, showing crack initiation due to strain concentration in the core region, consistent across all specimens. The sandwich panels printed with developed filaments exhibited comparable flexural properties to that of panels printed with commercial filaments, with a bending load capacity of up to 3.0 kN for approximately 50 g specimens. The printing quality and mechanical performance of the novel PEI and PPS composite formulations demonstrated in this study suggested that they could serve as viable alternatives to commercial filaments.</div></div>","PeriodicalId":283,"journal":{"name":"Composites Science and Technology","volume":"263 ","pages":"Article 111106"},"PeriodicalIF":8.3,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of introducing MXene nanosheets on the mechanical properties of carbon fiber reinforced epoxy composite at cryogenic temperature

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-02-10 DOI: 10.1016/j.compscitech.2025.111102

De-Yi Qu , Fang-Liang Guo , Wan-Dong Hou , Tao Guan , Yu-Tong Fu , Jie Hao , Chao-Yi Peng , Yong-Cun Zhang , Yuan-Qing Li , Shu-Tian Liu , Shao-Yun Fu

Carbon fiber reinforced epoxy (CFRE) composites have been concerned to achieve the light weighting of cryogenic fuel tanks for large launch vehicles. However, the mismatch of the coefficients of thermal expansion (CTEs) between epoxy matrix and carbon fibers hinder the application of CFRE composites in cryogenic fuel tanks. In this paper, the CFRE-MXene composite is prepared by using an MXene-modified epoxy resin as matrix, and the effects of introducing MXene nanosheets on the mechanical properties of CFRE-MXene composite at room temperature (RT) and 90 K are comprehensively investigated. The results indicate that the mechanical properties of CFRE-MXene composite are all obviously enhanced compared with those of the CFRE without MXene, and the MXene nanosheets incorporated can not only dramatically improve the strength of epoxy matrix, but also play a bridging and interfacial interlocking role between the matrix and carbon fibers. Meanwhile, MXene can effectively reduce the CTE of the epoxy matrix and alleviate the interface damage induced by residual thermal stresses. Moreover, a mesoscopic model is proposed to qualitatively reveal the interfacial enhancement mechanism between epoxy and carbon fibers by MXene. Consequently, proper interpretations are presented for the enhanced cryogenic mechanical properties of CFRE-MXene composite by introducing MXene.

{"title":"Effects of introducing MXene nanosheets on the mechanical properties of carbon fiber reinforced epoxy composite at cryogenic temperature","authors":"De-Yi Qu , Fang-Liang Guo , Wan-Dong Hou , Tao Guan , Yu-Tong Fu , Jie Hao , Chao-Yi Peng , Yong-Cun Zhang , Yuan-Qing Li , Shu-Tian Liu , Shao-Yun Fu","doi":"10.1016/j.compscitech.2025.111102","DOIUrl":"10.1016/j.compscitech.2025.111102","url":null,"abstract":"<div><div>Carbon fiber reinforced epoxy (CFRE) composites have been concerned to achieve the light weighting of cryogenic fuel tanks for large launch vehicles. However, the mismatch of the coefficients of thermal expansion (CTEs) between epoxy matrix and carbon fibers hinder the application of CFRE composites in cryogenic fuel tanks. In this paper, the CFRE-MXene composite is prepared by using an MXene-modified epoxy resin as matrix, and the effects of introducing MXene nanosheets on the mechanical properties of CFRE-MXene composite at room temperature (RT) and 90 K are comprehensively investigated. The results indicate that the mechanical properties of CFRE-MXene composite are all obviously enhanced compared with those of the CFRE without MXene, and the MXene nanosheets incorporated can not only dramatically improve the strength of epoxy matrix, but also play a bridging and interfacial interlocking role between the matrix and carbon fibers. Meanwhile, MXene can effectively reduce the CTE of the epoxy matrix and alleviate the interface damage induced by residual thermal stresses. Moreover, a mesoscopic model is proposed to qualitatively reveal the interfacial enhancement mechanism between epoxy and carbon fibers by MXene. Consequently, proper interpretations are presented for the enhanced cryogenic mechanical properties of CFRE-MXene composite by introducing MXene.</div></div>","PeriodicalId":283,"journal":{"name":"Composites Science and Technology","volume":"263 ","pages":"Article 111102"},"PeriodicalIF":8.3,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143421394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0