Polymer最新文献

英文中文

Revealing the film-forming property and microstructure evolution of polylactide during simultaneous biaxial stretching: Toward high-performance sustainable film

IF 4.1 2区化学 Q2 POLYMER SCIENCE

Polymer

Pub Date : 2025-04-05 DOI: 10.1016/j.polymer.2025.128360

Bingbing Zeng, Jinxiang Ai, Mingxin Xia, Yucen Pang, Jiabin Shen, Yu Zheng, Shaoyun Guo

The film-forming property of PLA during simultaneous biaxial stretching was investigated by the visualized contour graphic method. Meanwhile, the multiscale microstructure evolution in both amorphous and crystalline domains was studied in detail. It is revealed that the film thickness uniformity is governed by the microstructure evolution and related to the engineering stress-strain behavior. At the low stretching ratio, the excellent chain mobility and fast chain relaxation enabled by thermal activation and formation of gauche-gauche (gg) conformers make PLA show a linear elastic tensile behavior thus a good thickness uniformity. As the film subjected to yielding, the enhanced chain orientation promotes crystallization, inducing the conformational transition and the slowing down of chain relaxation. However, the localized disentanglement and disorientation of chains during yielding lead to the asynchronous structure evolution from the central to edge areas, bringing about the deterioration of film-forming property. At the high stretching ratio where PLA exhibits strain hardening, the oriented and crystalline structures of the whole film become homogeneous again, which optimizes the film thickness uniformity. Moreover, the isotropically oriented structure with tiny crystals imparts superior strength-toughness balance, good gas barrier property, and excellent optical transparency to the highly stretched PLA films. This work provides significant guidance for developing high-quality PLA films, and can also conduct significance in production of other biaxially oriented polymer films.

{"title":"Revealing the film-forming property and microstructure evolution of polylactide during simultaneous biaxial stretching: Toward high-performance sustainable film","authors":"Bingbing Zeng, Jinxiang Ai, Mingxin Xia, Yucen Pang, Jiabin Shen, Yu Zheng, Shaoyun Guo","doi":"10.1016/j.polymer.2025.128360","DOIUrl":"10.1016/j.polymer.2025.128360","url":null,"abstract":"<div><div>The film-forming property of PLA during simultaneous biaxial stretching was investigated by the visualized contour graphic method. Meanwhile, the multiscale microstructure evolution in both amorphous and crystalline domains was studied in detail. It is revealed that the film thickness uniformity is governed by the microstructure evolution and related to the engineering stress-strain behavior. At the low stretching ratio, the excellent chain mobility and fast chain relaxation enabled by thermal activation and formation of gauche-gauche (gg) conformers make PLA show a linear elastic tensile behavior thus a good thickness uniformity. As the film subjected to yielding, the enhanced chain orientation promotes crystallization, inducing the conformational transition and the slowing down of chain relaxation. However, the localized disentanglement and disorientation of chains during yielding lead to the asynchronous structure evolution from the central to edge areas, bringing about the deterioration of film-forming property. At the high stretching ratio where PLA exhibits strain hardening, the oriented and crystalline structures of the whole film become homogeneous again, which optimizes the film thickness uniformity. Moreover, the isotropically oriented structure with tiny crystals imparts superior strength-toughness balance, good gas barrier property, and excellent optical transparency to the highly stretched PLA films. This work provides significant guidance for developing high-quality PLA films, and can also conduct significance in production of other biaxially oriented polymer films.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"326 ","pages":"Article 128360"},"PeriodicalIF":4.1,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143784750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced leakage-proof performance of flexible phase change materials through the transformation of physicochemical crosslinked networks 通过改变物理化学交联网络增强柔性相变材料的防渗漏性能

IF 4.6 2区化学 Q2 POLYMER SCIENCE

Polymer

Pub Date : 2025-04-03 DOI: 10.1016/j.polymer.2025.128357

Shuai-Peng Wang, Shuang-Zhu Li, Wei-Wei Liu, Niu Jiang, Lu Bai, Rui-Ying Bao, Jie Yang, Wei Yang

Organic solid-liquid phase change materials (PCMs) show broad prospects in thermal regulation applications due to their salient thermal energy storage capacity and nearly isothermal characteristic during thermal charging and discharging processes. However, their intrinsic melt leakage and inflexibility significantly limit their applications, especially for the thermal regulation of emerging wearable technologies. Herein, a physicochemical crosslinking transformation strategy is developed for the large-scale production of advanced flexible PCMs through integrating paraffin wax (PW) into the robust polymer network. The resultant flexible PCMs exhibit excellent leakage-proof and water-proof performance. Meanwhile, the tunable polymer supporting network endows the flexible PCMs with high phase change enthalpy (> 150 J g⁻¹) and considerable ductility (> 60%), balancing the trade-off among shape stability, flexibility and phase change enthalpy of organic solid-liquid PCMs. In addition, the flexible PCMs provide an effective cooling solution on electronics, displaying promising thermal management applications on highly integrated electronics, wearable systems, and outdoor devices.

有机固液相变材料（PCM）具有显著的热能储存能力，在热充放电过程中几乎等温，因此在热调节应用中前景广阔。然而，其固有的熔体泄漏和不灵活性极大地限制了其应用，尤其是在新兴可穿戴技术的热调节方面。本文开发了一种物理化学交联转化策略，通过将石蜡（PW）整合到坚固的聚合物网络中，大规模生产先进的柔性 PCM。所制备的柔性 PCM 具有优异的防漏和防水性能。同时，可调聚合物支撑网络赋予柔性 PCM 较高的相变焓（150 J g-1）和相当大的延展性（60%），平衡了有机固液 PCM 在形状稳定性、柔性和相变焓之间的权衡。此外，柔性 PCM 还能为电子产品提供有效的冷却解决方案，在高度集成的电子产品、可穿戴系统和户外设备的热管理应用中大有可为。

{"title":"Enhanced leakage-proof performance of flexible phase change materials through the transformation of physicochemical crosslinked networks","authors":"Shuai-Peng Wang, Shuang-Zhu Li, Wei-Wei Liu, Niu Jiang, Lu Bai, Rui-Ying Bao, Jie Yang, Wei Yang","doi":"10.1016/j.polymer.2025.128357","DOIUrl":"https://doi.org/10.1016/j.polymer.2025.128357","url":null,"abstract":"Organic solid-liquid phase change materials (PCMs) show broad prospects in thermal regulation applications due to their salient thermal energy storage capacity and nearly isothermal characteristic during thermal charging and discharging processes. However, their intrinsic melt leakage and inflexibility significantly limit their applications, especially for the thermal regulation of emerging wearable technologies. Herein, a physicochemical crosslinking transformation strategy is developed for the large-scale production of advanced flexible PCMs through integrating paraffin wax (PW) into the robust polymer network. The resultant flexible PCMs exhibit excellent leakage-proof and water-proof performance. Meanwhile, the tunable polymer supporting network endows the flexible PCMs with high phase change enthalpy (> 150 J g<sup>−1</sup>) and considerable ductility (> 60%), balancing the trade-off among shape stability, flexibility and phase change enthalpy of organic solid-liquid PCMs. In addition, the flexible PCMs provide an effective cooling solution on electronics, displaying promising thermal management applications on highly integrated electronics, wearable systems, and outdoor devices.","PeriodicalId":405,"journal":{"name":"Polymer","volume":"73 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143776140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Polymer characterization techniques to accelerate discovery in vat photopolymerization and UV- assisted direct ink write 3D printing 利用聚合物表征技术加速发现大桶光聚合和紫外线辅助直接墨水写入式 3D 打印技术

IF 4.1 2区化学 Q2 POLYMER SCIENCE

Polymer

Pub Date : 2025-04-03 DOI: 10.1016/j.polymer.2025.128355

Garvit Nayyar , Christopher B. Williams , Timothy E. Long

引用次数: 0

Co-polarized electret fibers tailored by in-situ microphase separation for high-performance oil mist filter

IF 4.1 2区化学 Q2 POLYMER SCIENCE

Polymer

Pub Date : 2025-04-02 DOI: 10.1016/j.polymer.2025.128345

Qinghan Du , Juhui Yin , Haoxin Liu , Shuming Zhang , Yuyao Li

Oily particulate matter has emerged as a critical environmental and occupational hazard, significantly posing risks to both worker health and industrial machinery. Although glass fiber nonwovens are widely used to tackle this issue, they usually show inadequate efficiency while filtering small oil mists limited by their micro-sized large fiber diameter and single mechanical filtering mechanism. Herein, electret nanofibrous membranes with co-polarized property are in situ synthesized via electrospinning, which derives from the precisely tailoring of dual-polymers microphase separation along with the charge injection. Benefitting from the enhanced co-polarized effect of two polymers with completely different polarization, the electret performance of composite membranes can increase by 238 % compared to single-polymer membranes. What's more, the resulting membranes exhibited a dense, porous structure, achieving an oil mist filtration efficiency of 98.77 % and an air resistance as low as 38.92 Pa. This new strategy offers a novel solution for the design and development of next-generation oil mist filtration materials.

{"title":"Co-polarized electret fibers tailored by in-situ microphase separation for high-performance oil mist filter","authors":"Qinghan Du , Juhui Yin , Haoxin Liu , Shuming Zhang , Yuyao Li","doi":"10.1016/j.polymer.2025.128345","DOIUrl":"10.1016/j.polymer.2025.128345","url":null,"abstract":"<div><div>Oily particulate matter has emerged as a critical environmental and occupational hazard, significantly posing risks to both worker health and industrial machinery. Although glass fiber nonwovens are widely used to tackle this issue, they usually show inadequate efficiency while filtering small oil mists limited by their micro-sized large fiber diameter and single mechanical filtering mechanism. Herein, electret nanofibrous membranes with co-polarized property are in situ synthesized via electrospinning, which derives from the precisely tailoring of dual-polymers microphase separation along with the charge injection. Benefitting from the enhanced co-polarized effect of two polymers with completely different polarization, the electret performance of composite membranes can increase by 238 % compared to single-polymer membranes. What's more, the resulting membranes exhibited a dense, porous structure, achieving an oil mist filtration efficiency of 98.77 % and an air resistance as low as 38.92 Pa. This new strategy offers a novel solution for the design and development of next-generation oil mist filtration materials.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"326 ","pages":"Article 128345"},"PeriodicalIF":4.1,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Anisotropic and flexible fluorinated polyimide foams via co-polymerization and microwave-assisted foaming for efficient thermal insulation and hydrophobicity

IF 4.1 2区化学 Q2 POLYMER SCIENCE

Polymer

Pub Date : 2025-04-02 DOI: 10.1016/j.polymer.2025.128353

Long Ni, Lu Shen, Cuiqing Zhou, Yinfu Luo, Liwei Yan, Shuang Xia, Mei Liang, Shengtai Zhou, Huawei Zou

This work reports the flexible, hydrophobic and thermal insulative polyimide foams (PIFs) with anisotropic pore structure for potential application in high-tech fields. Polyester ammonium salt (PEAS) precursor powders with fluorinated groups were prepared by co-polymerization process and they were foamed using microwave-assisted foaming strategy. The introduction of 6FDA increased chain rigidity and decreased the melt viscosity of PEAS, which improved the foaming behavior of PEAS and the properties of subsequent PIFs. The PIFs had low density (18.61 kg/m³), high open cell rate (99.0%) and flexibility (compression response rate>97%), excellent thermal resistance (T_g = 292.9 °C) and thermal stability (T₅_% = 550.1 °C). Benefiting from the “bottom-up” directional foaming behavior, anisotropic pore structures were constructed in-situ and the fluorinated PIFs exhibited anisotropic mechanical, thermal insulation performance and hydrophobic behavior. The thermal conductivity of PIFs reached 0.0269 W/(m·K) in the horizontal direction (perpendicular to pore growth direction). The top surface temperature of PIFs was 67.8 °C after being heated on a 200 °C preheated hot plate for 30 min, exhibiting superior thermal insulation. The PIFs possessed exceptional hydrophobicity with a water contact angle as high as 131.7° and water absorption rate as low as 0.65 g/g. The flexible, hydrophobic and thermal insulative PIFs demonstrates promising application for long-term use in high-tech fields such as aerospace, transportation, construction and nuclear among others.

{"title":"Anisotropic and flexible fluorinated polyimide foams via co-polymerization and microwave-assisted foaming for efficient thermal insulation and hydrophobicity","authors":"Long Ni, Lu Shen, Cuiqing Zhou, Yinfu Luo, Liwei Yan, Shuang Xia, Mei Liang, Shengtai Zhou, Huawei Zou","doi":"10.1016/j.polymer.2025.128353","DOIUrl":"10.1016/j.polymer.2025.128353","url":null,"abstract":"<div><div>This work reports the flexible, hydrophobic and thermal insulative polyimide foams (PIFs) with anisotropic pore structure for potential application in high-tech fields. Polyester ammonium salt (PEAS) precursor powders with fluorinated groups were prepared by co-polymerization process and they were foamed using microwave-assisted foaming strategy. The introduction of 6FDA increased chain rigidity and decreased the melt viscosity of PEAS, which improved the foaming behavior of PEAS and the properties of subsequent PIFs. The PIFs had low density (18.61 kg/m<sup>3</sup>), high open cell rate (99.0%) and flexibility (compression response rate>97%), excellent thermal resistance (T<sub>g</sub> = 292.9 °C) and thermal stability (T<sub>5</sub><sub>%</sub> = 550.1 °C). Benefiting from the “bottom-up” directional foaming behavior, anisotropic pore structures were constructed in-situ and the fluorinated PIFs exhibited anisotropic mechanical, thermal insulation performance and hydrophobic behavior. The thermal conductivity of PIFs reached 0.0269 W/(m·K) in the horizontal direction (perpendicular to pore growth direction). The top surface temperature of PIFs was 67.8 °C after being heated on a 200 °C preheated hot plate for 30 min, exhibiting superior thermal insulation. The PIFs possessed exceptional hydrophobicity with a water contact angle as high as 131.7° and water absorption rate as low as 0.65 g/g. The flexible, hydrophobic and thermal insulative PIFs demonstrates promising application for long-term use in high-tech fields such as aerospace, transportation, construction and nuclear among others.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"326 ","pages":"Article 128353"},"PeriodicalIF":4.1,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fabrication of temperature and pH dual-sensitive semi-interpenetrating network hydrogel with enhanced adhesion and antibacterial properties

IF 4.1 2区化学 Q2 POLYMER SCIENCE

Polymer

Pub Date : 2025-04-02 DOI: 10.1016/j.polymer.2025.128343

Yan Liu , Yirong Wang , Yan Fu , NanNan Wang , Qianzhu Liu , Shangxin Zhao , Hong Yu Yang , Changling Liu

It is urgently needed to have antibacterial treatments that offer a controlled release of therapeutic agents, effectively targeting the breadth and universality of pathogens while ensuring sustained efficacy. Herein, we demonstrated the fabrication of a temperature and pH dual-sensitive hydrogel, prepared by cross-linking N-isopropyl acrylamide-co-acrylic acid (NIPAM-co-AA) networks with tannic acid (TA) and loaded with curcumin (Cur) (termed as NIPAM-co-AA/TA@Cur), providing the on-demand release of Cur triggered by changes in the wound microenvironment (MET). The prepared hydrogel exhibited excellent tensile property (50-fold the length of the original), superior self-healing ability, and high adhesion performance (6.2 kPa). We further confirmed that this dual-sensitive hydrogel can respond to typical wound pH and temperature changes, promoting Cur release (>90 % release) at alkaline pH (≥8.0) while achieving up to 92 % Cur release at 37 °C. The in vitro antibacterial efficacy tests displayed that a high potency to kill E.coli and S.aureus while significantly enhancing antibacterial ability under simulated wound MET with high temperature and alkaline conditions. This versatile hydrogel presents a promising approach for targeted drug delivery by responding to specific pathological regions, thereby minimizing potential side effects and bolstering antimicrobial efficacy.

{"title":"Fabrication of temperature and pH dual-sensitive semi-interpenetrating network hydrogel with enhanced adhesion and antibacterial properties","authors":"Yan Liu , Yirong Wang , Yan Fu , NanNan Wang , Qianzhu Liu , Shangxin Zhao , Hong Yu Yang , Changling Liu","doi":"10.1016/j.polymer.2025.128343","DOIUrl":"10.1016/j.polymer.2025.128343","url":null,"abstract":"<div><div>It is urgently needed to have antibacterial treatments that offer a controlled release of therapeutic agents, effectively targeting the breadth and universality of pathogens while ensuring sustained efficacy. Herein, we demonstrated the fabrication of a temperature and pH dual-sensitive hydrogel, prepared by cross-linking N-isopropyl acrylamide-co-acrylic acid (NIPAM-co-AA) networks with tannic acid (TA) and loaded with curcumin (Cur) (termed as NIPAM-co-AA/TA@Cur), providing the on-demand release of Cur triggered by changes in the wound microenvironment (MET). The prepared hydrogel exhibited excellent tensile property (50-fold the length of the original), superior self-healing ability, and high adhesion performance (6.2 kPa). We further confirmed that this dual-sensitive hydrogel can respond to typical wound pH and temperature changes, promoting Cur release (>90 % release) at alkaline pH (≥8.0) while achieving up to 92 % Cur release at 37 °C. The in vitro antibacterial efficacy tests displayed that a high potency to kill E.coli and S.aureus while significantly enhancing antibacterial ability under simulated wound MET with high temperature and alkaline conditions. This versatile hydrogel presents a promising approach for targeted drug delivery by responding to specific pathological regions, thereby minimizing potential side effects and bolstering antimicrobial efficacy.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"326 ","pages":"Article 128343"},"PeriodicalIF":4.1,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tailored chain interaction of binary and ternary PVDF-HFP and PVDF-TrFE-CTFE / graphene nanoplatelets on dielectric properties and charge density capability

IF 4.1 2区化学 Q2 POLYMER SCIENCE

Polymer

Pub Date : 2025-04-01 DOI: 10.1016/j.polymer.2025.128339

Suphita Chaipo , Ponkrit Itsaradamkoeng , Subhan Salaeh , Komkrisd Wongtimnoi , Chatchai Putson , Jia-Wei Zhang

In this study, a semi-crystalline copolymer, Poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), was blended with Poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) (PVDF-TrFE-CTFE) and Graphene Nanoplatelets (GNP) to fabricate 2-phase and 3-phase composite films. The heterostructure blending enhanced the dielectric constant and polarization. Moreover, the chain interaction between the terpolymer and copolymer improved compatibility with the GNP, reducing charge accumulation and leakage current. The films were prepared using the tape-casting solution method with varying terpolymer loadings. Their bonding, surface structure, and morphology were analyzed using SEM, FTIR, AFM, and contact angle measurements. Electrical properties and energy storage capabilities were evaluated using an LCR meter and a ferroelectric measurement setup. The combination of PVDF-TrFE-CTFE induced significant changes in the morphology, crystallinity, dielectric properties and electrical breakdown strength. Notably, blending with the terpolymer increased the energy storage density from 0.14 J/cm³ (T0) to 0.26 J/cm³ (T70) at 40 kV/mm. Additionally, adding 1 wt% GNP enhanced interfacial polarization, with the T30 + GNP composite nearly 2 times the energy storage density compared to the neat T30 film (0.14 J/cm³ vs. 0.22 J/cm³ at 40 kV/mm). The combination of copolymer and terpolymer also improved the electrical breakdown strength, with T70 reaching 540 kV/mm. These enhancements in polymer-GNP interactions, charge carrier dynamics, and electrical breakdown strength demonstrate the potential of this composite material for high-performance dielectric applications, particularly in capacitive energy storage systems.

{"title":"Tailored chain interaction of binary and ternary PVDF-HFP and PVDF-TrFE-CTFE / graphene nanoplatelets on dielectric properties and charge density capability","authors":"Suphita Chaipo , Ponkrit Itsaradamkoeng , Subhan Salaeh , Komkrisd Wongtimnoi , Chatchai Putson , Jia-Wei Zhang","doi":"10.1016/j.polymer.2025.128339","DOIUrl":"10.1016/j.polymer.2025.128339","url":null,"abstract":"<div><div>In this study, a semi-crystalline copolymer, Poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), was blended with Poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) (PVDF-TrFE-CTFE) and Graphene Nanoplatelets (GNP) to fabricate 2-phase and 3-phase composite films. The heterostructure blending enhanced the dielectric constant and polarization. Moreover, the chain interaction between the terpolymer and copolymer improved compatibility with the GNP, reducing charge accumulation and leakage current. The films were prepared using the tape-casting solution method with varying terpolymer loadings. Their bonding, surface structure, and morphology were analyzed using SEM, FTIR, AFM, and contact angle measurements. Electrical properties and energy storage capabilities were evaluated using an LCR meter and a ferroelectric measurement setup. The combination of PVDF-TrFE-CTFE induced significant changes in the morphology, crystallinity, dielectric properties and electrical breakdown strength. Notably, blending with the terpolymer increased the energy storage density from 0.14 J/cm<sup>3</sup> (T0) to 0.26 J/cm<sup>3</sup> (T70) at 40 kV/mm. Additionally, adding 1 wt% GNP enhanced interfacial polarization, with the T30 + GNP composite nearly 2 times the energy storage density compared to the neat T30 film (0.14 J/cm<sup>3</sup> vs. 0.22 J/cm<sup>3</sup> at 40 kV/mm). The combination of copolymer and terpolymer also improved the electrical breakdown strength, with T70 reaching 540 kV/mm. These enhancements in polymer-GNP interactions, charge carrier dynamics, and electrical breakdown strength demonstrate the potential of this composite material for high-performance dielectric applications, particularly in capacitive energy storage systems.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"326 ","pages":"Article 128339"},"PeriodicalIF":4.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143745320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rheological and thermal investigation of blends of ionically cross-linked and un-modified polypropylene and preparation of carbon black-based electromagnetic wave shielding composites 离子交联聚丙烯和未改性聚丙烯混合物的流变学和热学研究以及炭黑基电磁波屏蔽复合材料的制备

IF 4.1 2区化学 Q2 POLYMER SCIENCE

Polymer

Pub Date : 2025-04-01 DOI: 10.1016/j.polymer.2025.128342

Hussain Namvar Maroofy , Mohammad-Javad Hafezi , Hadi Veisi

Initially, blends of ionically cross-linked PP (icPP) and unmodified PP were prepared. The miscibility and morphologies of the blends were studied with thermal and rheological analyses. It was confirmed that the blends were immiscible and formed co-continuous morphologies at icPP contents higher than 57.5 wt%. The formation of an inter-phase with synergistic properties was confirmed. Subsequently, CB incorporated to the blend composition with co-continuous morphology at 82.5 wt% icPP. Three strategies were implemented to hamper CB migration from unmodified PP to icPP phase during blending. A DC conductivity of 7.68 × 10-5 S cm⁻¹ was achieved at 2.625 wt% CB, which was close to the conductivity of unmodified PP with 12.5 wt% CB. The samples were tested for EMI shielding properties in the microwave frequency region. A minimum RL of −23.14 dB was obtained. SEM imaging confirmed the co-continuous morphology for the blended samples with CB and the localization of CB particles.

引用次数: 0

The peel strength (cohesive/adhesive) of amine-associating polymers

IF 4.1 2区化学 Q2 POLYMER SCIENCE

Polymer

Pub Date : 2025-04-01 DOI: 10.1016/j.polymer.2025.128337

Ziyue Zhang, Nafiseh Moradinik, Savvas G. Hatzikiriakos

A class of amine-containing associating polymers (APE) has been found to be a promising adhesive on low surface energy substrates. The peel strength of two APE samples of different molecular weight is measured over a large range of peel rates. A quantitative model has been developed to predict the peel performance of APEs by interrelating elongational viscoelastic properties and peeling performance. The model considers the effect of shape variation of a polyethylene substrate in T-peel mode by introducing a shape parameter

R_{c}

. Besides

R_{c}

and the viscoelastic elongational properties, cohesive and adhesive fracture criteria are required for determining the peel strength and the transition from cohesive to adhesive failure. Different fracture criteria were evaluated and selected purely based on the basis of adequately describing the experimental results. A single set of fracture criteria is found to describe the experimental results well, offering an effective way for adhesive property optimization.

{"title":"The peel strength (cohesive/adhesive) of amine-associating polymers","authors":"Ziyue Zhang, Nafiseh Moradinik, Savvas G. Hatzikiriakos","doi":"10.1016/j.polymer.2025.128337","DOIUrl":"10.1016/j.polymer.2025.128337","url":null,"abstract":"<div><div>A class of amine-containing associating polymers (APE) has been found to be a promising adhesive on low surface energy substrates. The peel strength of two APE samples of different molecular weight is measured over a large range of peel rates. A quantitative model has been developed to predict the peel performance of APEs by interrelating elongational viscoelastic properties and peeling performance. The model considers the effect of shape variation of a polyethylene substrate in T-peel mode by introducing a shape parameter <span><math><mrow><msub><mi>R</mi><mi>c</mi></msub></mrow></math></span>. Besides <span><math><mrow><msub><mi>R</mi><mi>c</mi></msub></mrow></math></span> and the viscoelastic elongational properties, cohesive and adhesive fracture criteria are required for determining the peel strength and the transition from cohesive to adhesive failure. Different fracture criteria were evaluated and selected purely based on the basis of adequately describing the experimental results. A single set of fracture criteria is found to describe the experimental results well, offering an effective way for adhesive property optimization.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"326 ","pages":"Article 128337"},"PeriodicalIF":4.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143745509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Polyurethane synthesis revisited: Effect of solvent, stoichiometry, and temperature on the reaction of MDI with polyether glycols

IF 4.1 2区化学 Q2 POLYMER SCIENCE

Polymer

Pub Date : 2025-04-01 DOI: 10.1016/j.polymer.2025.128340

Armen Yildirim, Emel Yilgor, Iskender Yilgor

Thermoplastic polyurethanes (TPU) are one of the most widely investigated polymeric systems due to their interesting structure-morphology-property behavior. They also find broad range of applications in various fields. Global TPU market is projected to grow about 7.3 % annually from $2.30 billion in 2021 to $3.80 billion in 2028. 4,4′-Diphenylmethane diisocyanate (MDI) is the most widely used diisocyanate for the preparation of TPUs both in academia and industry. When TPU synthesis is carried out in solution, a polar aprotic solvent is necessary to obtain high molecular weight polymers. Most preferred solvents for TPU synthesis are high boiling, polar, aprotic solvents, such as dimethylacetamide (DMAC), dimethylformamide (DMF), dimethyl sulfoxide (DMSO) and N-methyl pyrrolidone (NMP). When MDI is used as the diisocyanate, depending on the solvent used and reaction temperature, extensive side reactions may be observed, which consume excess diisocyanate and affect reaction stoichiometry. Side reactions also strongly influence TPU structure, topology, microphase morphology, and properties. In this study influence of the solvent, initial [NCO]/[OH] stoichiometry and reaction temperature on the rate of isocyanate consumption and kinetics of the reactions between MDI and poly(tetramethylene oxide) glycol (PTMO) were investigated. Catalytic effect of DMF even at reactions conducted at room temperature were observed, resulting in significant excess MDI consumption due to extensive side reactions. During prepolymer formation in [MDI]/[PTMO] = 2.0 system at 50 °C, side reactions were minimized or eliminated by using THF/DMF or toluene/DMF (90/10 by volume) solvent mixtures.

{"title":"Polyurethane synthesis revisited: Effect of solvent, stoichiometry, and temperature on the reaction of MDI with polyether glycols","authors":"Armen Yildirim, Emel Yilgor, Iskender Yilgor","doi":"10.1016/j.polymer.2025.128340","DOIUrl":"10.1016/j.polymer.2025.128340","url":null,"abstract":"<div><div>Thermoplastic polyurethanes (TPU) are one of the most widely investigated polymeric systems due to their interesting structure-morphology-property behavior. They also find broad range of applications in various fields. Global TPU market is projected to grow about 7.3 % annually from $2.30 billion in 2021 to $3.80 billion in 2028. 4,4′-Diphenylmethane diisocyanate (MDI) is the most widely used diisocyanate for the preparation of TPUs both in academia and industry. When TPU synthesis is carried out in solution, a polar aprotic solvent is necessary to obtain high molecular weight polymers. Most preferred solvents for TPU synthesis are high boiling, polar, aprotic solvents, such as dimethylacetamide (DMAC), dimethylformamide (DMF), dimethyl sulfoxide (DMSO) and N-methyl pyrrolidone (NMP). When MDI is used as the diisocyanate, depending on the solvent used and reaction temperature, extensive side reactions may be observed, which consume excess diisocyanate and affect reaction stoichiometry. Side reactions also strongly influence TPU structure, topology, microphase morphology, and properties. In this study influence of the solvent, initial [NCO]/[OH] stoichiometry and reaction temperature on the rate of isocyanate consumption and kinetics of the reactions between MDI and poly(tetramethylene oxide) glycol (PTMO) were investigated. Catalytic effect of DMF even at reactions conducted at room temperature were observed, resulting in significant excess MDI consumption due to extensive side reactions. During prepolymer formation in [MDI]/[PTMO] = 2.0 system at 50 °C, side reactions were minimized or eliminated by using THF/DMF or toluene/DMF (90/10 by volume) solvent mixtures.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"326 ","pages":"Article 128340"},"PeriodicalIF":4.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

首页上一页

下一页尾页

类型

全部化学•材料生命科学医学物理工程技术环境•农林材料科学地球科学法学管理学化学环境科学与生态学计算机科学教育学经济学农林科学人文科学生物学数学物理与天体物理心理学综合性期刊其他工业工程理学历史学农学文学信息工程

数据库

全部 ACS Publications Elsevier ieeexplore Springer The Royal Society of Chemistry Wiley

期刊

Polymer

全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.

﹀