Composites Science and Technology最新文献_第8页

Multilayer design and multi-objective optimization of neutron shielding composites by means of MCNP simulation and machine learning 基于MCNP仿真和机器学习的中子屏蔽复合材料多层设计与多目标优化

IF 9.8 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-11-15 DOI: 10.1016/j.compscitech.2025.111451

Benben Liu , Yizhuo Gu , Ruiqi Guo , Shaokai Wang , Min Li

To meet neutron shielding and lightweight requirements, fiber-reinforced polymer matrix composites offer significant advantages as multifunctional materials with both structural and shielding capabilities. Owing to their inherent multicomponent and multilayered configurations, selecting suitable reinforcements and optimizing multilayer structure remains challenging. This study addresses the design and multi-objective optimization of multilayer composite shielding structures for neutron radiation protection. Monte Carlo N-Particle (MCNP) simulation method is adopted to predict radiation shielding property of various composites. A homogeneous model is first employed to examine the effects of typical shielding fillers (B₄C and WO₃) on the effective neutron dose in an epoxy resin matrix across the full neutron energy spectrum. Subsequently, an idealized layered structure model is used to clarify material composition strategies and multi-layer design principles for epoxy resin matrix composite. The results show that for fast neutron protection, a bilayer configuration with a high-Z material as the front layer and a hydrogen-rich matrix as the rear layer is optimal. For slow neutron protection, multilayer configurations demonstrate significant advantages: a 128-layer structure can reduce the effective dose of slow neutrons by up to 30 % compared with a bilayer structure. Furthermore, a multi-objective optimization strategy is proposed for multilayer structures by integrating MCNP simulations with machine learning, which can optimize shielding efficiency, structural thickness, and overall mass. Among six regression algorithms, a three-layer neural network model is chosen, which achieves high prediction precision. This approach optimizes both the minimum-dose configuration at fixed thickness and the minimum-weight configuration at fixed dose, providing efficient design guidelines for multilayer composite shielding.

为了满足中子屏蔽和轻量化的要求，纤维增强聚合物基复合材料作为兼具结构和屏蔽能力的多功能材料具有显著的优势。由于其固有的多组分和多层结构，选择合适的增强材料和优化多层结构仍然是一个挑战。研究了用于中子辐射防护的多层复合屏蔽结构的设计与多目标优化。采用蒙特卡罗n粒子（MCNP）模拟方法对各种复合材料的辐射屏蔽性能进行了预测。本文首先采用均匀模型研究了典型屏蔽填料（B4C和WO3）在全中子能谱范围内对环氧树脂基体中有效中子剂量的影响。随后，利用理想分层结构模型阐明了环氧树脂基复合材料的材料组成策略和多层设计原则。结果表明，对于快中子防护，以高z材料为前层，富氢基质为后层的双层结构是最优的。对于慢中子防护，多层结构显示出显著的优势：与双层结构相比，128层结构可以减少多达30%的慢中子有效剂量。此外，将MCNP仿真与机器学习相结合，提出了多层结构的多目标优化策略，可以优化屏蔽效率、结构厚度和总质量。在六种回归算法中，选择了三层神经网络模型，实现了较高的预测精度。该方法优化了固定厚度下的最小剂量配置和固定剂量下的最小重量配置，为多层复合屏蔽提供了有效的设计指导。

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引用次数: 0

Supramolecular network-modified pyrolytically recycled carbon fiber composites with recyclability, shape-memory effects, and flame retardation 具有可回收性、形状记忆效应和阻燃性的超分子网络改性热解再生碳纤维复合材料

IF 9.8 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-11-15 DOI: 10.1016/j.compscitech.2025.111450

Jiaming Li , Xinyu Lu , Hongmingjian Zhang , Haonuo He , Manxi Zhou , Xiaoping Yang , Gang Sui

With the continuous increase in the use of carbon fiber composites, the composite waste generated during production and application will always have an impact on the environment. By pyrolyzing carbon fiber composites, carbon fibers can be recycled, which is also beneficial for the sustainable development of carbon fiber composites. Compared to commercial carbon fiber (CFs), the performance of recycled carbon fiber (rCFs) is somewhat reduced, and it is generally mainly used as a low value filler. In order to enhance the application value of recycled fibers and broaden their application fields, we developed a simple, eco-friendly modification technique to construct supramolecular networks on the surface of rCFs. Evaluate the application effect of carbon fiber by preparing composite materials with tannic acid cured epoxy resin (TE). In comparison with rCFs composite samples, the supramolecular network modified rCF composites can achieve performance improvements through synergistic non covalent and covalent interface interactions: mechanical strength increased by 27.01 %, shape memory storage entropy energy density increased by 8.95 %, and structural stability was maintained under high temperature conditions. This work provides a new technological approach for the widespread application of recycled carbon fibers.

随着碳纤维复合材料使用量的不断增加，在生产和应用过程中产生的复合材料废弃物总是会对环境产生影响。通过对碳纤维复合材料进行热解，可以回收利用碳纤维，这也有利于碳纤维复合材料的可持续发展。与商用碳纤维（CFs）相比，再生碳纤维（rcf）的性能有所降低，一般主要用作低价值填料。为了提高再生纤维的应用价值，拓宽其应用领域，我们开发了一种简单、环保的改性技术，在再生纤维表面构建超分子网络。评价单宁酸固化环氧树脂（TE）制备碳纤维复合材料的应用效果。与rCF复合材料样品相比，超分子网络改性的rCF复合材料通过非共价界面和共价界面的协同作用实现了性能的提高：机械强度提高27.01%，形状记忆存储熵能密度提高8.95%，在高温条件下保持结构稳定性。本研究为再生碳纤维的广泛应用提供了新的技术途径。

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引用次数: 0

High-performance epoxy composites based on 3D interconnected hybrid filler network interface engineering: Synergistic enhancement of thermal and mechanical properties 基于三维互联杂化填料网络界面工程的高性能环氧复合材料：热性能和力学性能的协同增强

IF 9.8 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-11-12 DOI: 10.1016/j.compscitech.2025.111436

Shuaishuai Zhou , Peiwen Sun , Mingxin Zhong , Shaohua Li , Peng Zhang , Meihong Liao , Peng Ding , Jingjie Dai

The exponential advancement of artificial intelligence technologies has driven a corresponding surge in chip power density. Effective heat dissipation is the key factor restricting their safety and reliability thereby intensifying the demand for advanced thermal management materials. Nevertheless, persistent trade-offs in thermomechanical properties constitute a fundamental bottleneck in the development of high-performance thermal management materials. In this work, epoxy resin composites with three-dimensional (3D) interconnected hybrid filler networks were fabricated by a multiscale cooperative strategy of “freeze-drying, high-temperature carbonization, and in-situ impregnation”. Based on the interface engineering strategy, the morphology synergy between graphene nanosheets and hydroxylated boron nitride nanosheets was utilized to construct an interconnected 3D network. Combined with high-temperature carbonization to eliminate network defects, the synergistic optimization of thermal conductivity and mechanical properties of epoxy composites was successfully achieved. The prepared epoxy composite exhibits an exceptional through-plane thermal conductivity of 3.10 W m⁻¹ K⁻¹ at a low hybrid filler content of 4.65 wt%, achieving a remarkable 1326 % improvement over pristine epoxy. Notably, it retains excellent compressive strength (204 MPa), indicating balanced thermomechanical properties. This work successfully overcomes the long-standing thermomechanical trade-off limitation in composite materials, offering novel design guidelines for next-generation high-efficiency thermal management composites.

人工智能技术的指数级发展带动了芯片功率密度的相应激增。有效的散热是制约其安全性和可靠性的关键因素，从而加大了对先进热管理材料的需求。然而，热机械性能的持续权衡构成了高性能热管理材料发展的基本瓶颈。采用“冷冻干燥-高温碳化-原位浸渍”的多尺度协同策略，制备了具有三维互联杂化填料网络的环氧树脂复合材料。基于界面工程策略，利用石墨烯纳米片和羟基化氮化硼纳米片之间的形态协同作用，构建了一个相互连接的三维网络。结合高温碳化消除网状缺陷，成功实现了环氧复合材料导热性能和力学性能的协同优化。在杂化填料含量为4.65 wt%的情况下，制备的环氧复合材料的通平面导热系数为3.10 W m−1 K−1，比原始环氧树脂的导热系数提高了1326%。值得注意的是，它保持了优异的抗压强度（204 MPa），表明平衡的热机械性能。这项工作成功地克服了复合材料长期存在的热力学权衡限制，为下一代高效热管理复合材料提供了新的设计指南。

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引用次数: 0

A micromechanics-based numerical study on the viscoelastic damping in carbon nanotube/polymer nanocomposites 基于微力学的碳纳米管/聚合物纳米复合材料粘弹性阻尼数值研究

IF 9.8 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-11-11 DOI: 10.1016/j.compscitech.2025.111449

Kasra Abedi , Hasan Seraj , Reza Ansari , Mohammad Kazem Hassanzadeh-Aghdam , Jamaloddin Jamali , Saeid Sahmani

The viscoelastic damping behavior of carbon nanotube (CNT)/polymer nanocomposites is investigated using a 3D numerical micromechanical model based on the finite element method (FEM) and a complex modulus approach. This model uniquely considers the collective behavior and interactions of multiple, randomly or directionally aligned CNTs within a representative volume element (RVE). To account for the frictional energy dissipation at the interface, a thin, weakened, and lossy interphase is simulated around the CNTs. The computational framework is validated by comparing its predictions for the elastic, viscoelastic creep, and damping properties with existing experimental data. Furthermore, the model is used to perform a sensitivity analysis, exploring the influence of key nanostructural parameters on the effective loss factor of the nanocomposite. The results show that the effective loss factor is significantly enhanced by increasing the CNT volume fraction, a finding directly linked to the greater presence of the lossy interphase. Damping also increases with a thicker interphase and a higher relative loss factor of the interphase. The CNT aspect ratio is shown to have a notable effect, influencing the maximum damping achievable at a specific volume fraction. Finally, for aligned nanofillers, the study reveals a strong dependency of the directional loss factors on the CNT off-axis angle.

采用基于有限元法和复模量法的三维数值细观力学模型，研究了碳纳米管/聚合物纳米复合材料的粘弹性阻尼行为。该模型独特地考虑了代表性体积单元（RVE）内多个随机或定向排列的碳纳米管的集体行为和相互作用。为了考虑界面处的摩擦能量耗散，在CNTs周围模拟了一个薄的、减弱的、有损的界面相。通过将其对弹性、粘弹性蠕变和阻尼特性的预测与现有实验数据进行比较，验证了计算框架的有效性。此外，利用该模型进行了灵敏度分析，探讨了关键纳米结构参数对纳米复合材料有效损耗因子的影响。结果表明，通过增加碳纳米管体积分数，有效损耗因子显着增强，这一发现与损耗间相的存在直接相关。阻尼也随着间相厚度的增加和间相相对损耗因子的增加而增加。碳纳米管长径比具有显著的影响，影响在特定体积分数下可实现的最大阻尼。最后，对于定向纳米填料，研究揭示了碳纳米管离轴角对定向损失因子的强烈依赖性。

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引用次数: 0

Acoustic emission analysis of the interlaminar resistance increase during Mode I delamination with fibre bridging in composite laminates 复合材料层合板纤维桥接I型分层时层间阻力增加的声发射分析

IF 9.8 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-11-10 DOI: 10.1016/j.compscitech.2025.111446

Liaojun Yao , Zelin Chen , Zixian He , Stepan V. Lomov , Valter Carvelli , Sergei B. Sapozhnikov , Yonglyu He , Wensong Zhou , Yu Feng , Liyong Jia

This study investigates the damage mechanisms and associated interlaminar toughness (G_IC) increase in Mode I delamination with large-scale fibre bridging for a carbon fibre/epoxy composite. Using Acoustic Emission (AE), Wavelet Packet Transform (WPT), and scanning electron microscopy, four damage modes were identified: matrix cracking, interface debonding, fibre pullout and fibre breakage. These modes are combined in the fibre bridging process. Cluster analysis of AE signals correlated each mode to a specific AE signature. The AE energy rate (AEER), defined as the cumulative AE energy per unit of crack propagation length, revealed that fibre pullout, with an AEER at least an order of magnitude higher than other modes, is the dominant toughening mechanism for G_IC increase. Matrix cracking and interface debonding have a moderate effect, whereas fibre breakage has little effect on the G_IC increase. The magnitude of G_IC during delamination propagation also correlates with the instantaneous cumulative absolute energy per AE counts (d(AEE)/d(Counts)), defined as the ratio of the differential of cumulative AE absolute energy to the differential of cumulative counts. This ratio increases with delamination growth and finally stabilizes. These correlations provide a basis for evaluating damage mechanisms and designing composite toughening strategies.

本研究探讨了碳纤维/环氧复合材料在大规模纤维桥接的I型分层中的损伤机制和相关的层间韧性（GIC）增加。利用声发射（AE）、小波包变换（WPT）和扫描电镜（sem）等方法，识别出基体开裂、界面脱粘、纤维拉拔和纤维断裂四种损伤模式。这些模式在光纤桥接过程中结合在一起。声发射信号的聚类分析将每种模式与特定的声发射特征相关联。声发射能率（AEER）（定义为每单位裂纹扩展长度的累积声发射能量）表明，纤维拉拔是GIC增加的主要增韧机制，其AEER至少比其他模式高一个数量级。基体开裂和界面脱粘对gcs的影响中等，而纤维断裂对gcs的影响较小。分层传播过程中GIC的大小也与每声发射计数瞬时累积绝对能量(d（AEE)/d(counts)）相关，定义为累积声发射绝对能量差与累积计数差的比值。该比率随着分层的增长而增加，并最终趋于稳定。这些相关性为评价复合材料损伤机理和设计复合材料增韧策略提供了依据。

{"title":"Acoustic emission analysis of the interlaminar resistance increase during Mode I delamination with fibre bridging in composite laminates","authors":"Liaojun Yao , Zelin Chen , Zixian He , Stepan V. Lomov , Valter Carvelli , Sergei B. Sapozhnikov , Yonglyu He , Wensong Zhou , Yu Feng , Liyong Jia","doi":"10.1016/j.compscitech.2025.111446","DOIUrl":"10.1016/j.compscitech.2025.111446","url":null,"abstract":"<div><div>This study investigates the damage mechanisms and associated interlaminar toughness (<em>G</em><sub>IC</sub>) increase in Mode I delamination with large-scale fibre bridging for a carbon fibre/epoxy composite. Using Acoustic Emission (AE), Wavelet Packet Transform (WPT), and scanning electron microscopy, four damage modes were identified: matrix cracking, interface debonding, fibre pullout and fibre breakage. These modes are combined in the fibre bridging process. Cluster analysis of AE signals correlated each mode to a specific AE signature. The AE energy rate (AEER), defined as the cumulative AE energy per unit of crack propagation length, revealed that fibre pullout, with an AEER at least an order of magnitude higher than other modes, is the dominant toughening mechanism for <em>G</em><sub>IC</sub> increase. Matrix cracking and interface debonding have a moderate effect, whereas fibre breakage has little effect on the <em>G</em><sub>IC</sub> increase. The magnitude of <em>G</em><sub>IC</sub> during delamination propagation also correlates with the instantaneous cumulative absolute energy per AE counts (<em>d</em>(AEE)/<em>d</em>(Counts)), defined as the ratio of the differential of cumulative AE absolute energy to the differential of cumulative counts. This ratio increases with delamination growth and finally stabilizes. These correlations provide a basis for evaluating damage mechanisms and designing composite toughening strategies.</div></div>","PeriodicalId":283,"journal":{"name":"Composites Science and Technology","volume":"274 ","pages":"Article 111446"},"PeriodicalIF":9.8,"publicationDate":"2025-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145518878","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

Experimental evaluation of residual microstresses in CFRP composites using nanoindentation and FIB cross-sectioning 基于纳米压痕和FIB截面的CFRP复合材料残余微应力实验评估

IF 9.8 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-11-10 DOI: 10.1016/j.compscitech.2025.111447

Sarvenaz Ghaffari, Andrew Makeev

Residual microstress is one of the major concerns in polymer-matrix composites. It may arise from mismatch in the physical and mechanical properties of the constituents, leading to premature material failure and damage in structural components. Therefore, it is important to understand and account for such stresses in design and manufacturing of advanced composites. This study presents a combined experimental approach to quantify residual microstresses in the matrix of carbon fiber-reinforced polymer (CFRP) composites. Residual stresses are released by fiber push-out, resulting in matrix deformation. Matrix deformation along the fiber direction, as well as in the fiber cross-section plane, is measured to estimate the residual microstresses. Deformation in the fiber direction is characterized using two complementary techniques: (1) nanoindentation to measure out-of-plane displacement, and (2) focused ion beam (FIB) cross-sectioning to visualize resin shrinkage associated with stress relaxation. Both methods reveal a cave-in effect at the resin pocket surfaces, confirming tensile residual stress in the matrix. In-plane deformation is evaluated by measuring the change in the cross-sectional diameter of the matrix hole before and after fiber push-out. An analytical solution has been devised to convert the measured strains into stresses near fibers, addressing the significance of residual microstresses. Results for a unidirectional CFRP tape material system, suitable for aircraft primary structures, show high tensile residual stress values in the matrix near the fiber surface. Such residual stresses, accelerating the onset of matrix cracking, can be detrimental to structural integrity.

残余微应力是聚合物基复合材料研究的主要问题之一。它可能是由成分的物理和机械性能不匹配引起的，导致结构部件的材料过早失效和损坏。因此，在先进复合材料的设计和制造中，理解和考虑这种应力是很重要的。本研究提出了一种结合实验的方法来量化碳纤维增强聚合物（CFRP）复合材料基体中的残余微应力。残余应力通过纤维外推释放，导致基体变形。测量基体沿纤维方向和纤维截面的变形，以估计残余微应力。纤维方向上的变形使用两种互补技术来表征：(1)纳米压痕测量面外位移，(2)聚焦离子束（FIB）横截面观察与应力松弛相关的树脂收缩。两种方法都揭示了树脂袋表面的塌陷效应，证实了基体中的拉伸残余应力。通过测量纤维推出前后基体孔截面直径的变化来评估面内变形。设计了一种解析解，将测量的应变转换为纤维附近的应力，解决了残余微应力的重要性。结果表明，适用于飞机初级结构的单向CFRP带材料体系在靠近纤维表面的基体中显示出较高的拉伸残余应力值。这样的残余应力，加速了基体开裂的发生，对结构的完整性是有害的。

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引用次数: 0

Biomimetic all-fiber hierarchical multiscale composite aerogels for multifunctional thermal, acoustic, and oil absorption applications 仿生全纤维分层多尺度复合气凝胶，用于多功能热、声学和吸油应用

IF 9.8 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-11-08 DOI: 10.1016/j.compscitech.2025.111445

Yanyan Wang , Xiaoqing Yin , Nan Pang , Xiaomin Yuan , Quan Han , Meijie Yu , Chengguo Wang , Chuanjian Zhou

As modern industry develops, the demand for multifunctional and structurally robust organic composite aerogels has grown, but conventional counterparts remain mechanically fragile and functionally limited. Inspired by the hierarchical multiscale structure of bird nests, this work proposes a structurally stable and multifunctional all-fiber multiscale composite aerogel (MCA) design strategy. By tuning the dissociation degree of aramid fibers (AF), multiscale aramid fibers (MAF) with an ultrabroad diameter distribution were innovatively obtained and co-assembled with electrospun polyimide nanofibers (PINF) into a nest-like composite network with fiber diameters spanning nanometers to micrometers. The self-assembly of aramid nanofibers (ANF) and the interweaving of multiscale fibers significantly enhance mechanical robustness, achieving synergistic improvements in compression, flexibility, and stretchability. The open hierarchical porous structure enabled low thermal conductivity (28.3–32.6 mW m⁻¹ K⁻¹), broad-frequency high-efficiency sound absorption (coefficient > 0.9 from 1920 to 6400 Hz), and exceptional oil absorption (over 107 times its weight), outperforming most reported aerogels. Moreover, the MCA remains stable from −196 to 500 °C and enables tunable infrared camouflage through low-emissivity coatings. The MCA developed in this work combines excellent mechanical performance with multifunctionality, providing a structurally stable, facile, and high-performance design approach for advanced aerogels.

随着现代工业的发展，对多功能和结构坚固的有机复合气凝胶的需求不断增长，但传统的气凝胶仍然是机械脆弱和功能有限的。受燕窝分层多尺度结构的启发，本文提出了一种结构稳定、多功能的全纤维多尺度复合气凝胶（MCA）设计策略。通过调整芳纶纤维（AF）的解离度，创新地获得了具有超宽直径分布的多尺度芳纶纤维（MAF），并与静电纺聚酰亚胺纳米纤维（PINF）共组装成纤维直径跨越纳米至微米的巢状复合网络。芳纶纳米纤维（ANF）的自组装和多尺度纤维的交织显著增强了机械稳健性，实现了压缩、柔韧性和拉伸性的协同改善。开放的分层多孔结构具有低导热系数（28.3-32.6 mW m−1 K−1），高频高效吸声（系数>； 0.9，从1920到6400 Hz）和出色的吸油性（超过其重量的107倍），优于大多数报道的气凝胶。此外，MCA在- 196至500°C范围内保持稳定，并通过低发射率涂层实现可调红外伪装。在这项工作中开发的MCA结合了优异的机械性能和多功能，为先进的气凝胶提供了结构稳定、方便和高性能的设计方法。

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引用次数: 0

Fluorine-containing meta-aramid modified low dielectric, hydrophobic aramid paper 含氟间位芳纶改性低介电疏水性芳纶纸

IF 9.8 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-11-07 DOI: 10.1016/j.compscitech.2025.111444

Yifan Hu, Qiuyue Zuo, Haowei Li, Lan Lei, Chunjie Xie, Hui Li

Aramid paper with excellent mechanical properties, heat resistance and electrical insulation properties has a wide range of applications. However, traditional aramid paper still has problems such as easy moisture absorption and high dielectric constant, which to some extent limit its application in new fields, such as 5G/6G communication and wearable flexible devices. In this work, fluorine-containing meta-aramid solution was prepared. Different concentrations of fluorine-containing meta-aramid solutions were used to coat commercial aramid paper by scraping. Finally, a series of aramid papers modified by fluorine-containing aramid solution were obtained through drying treatment. The basic parameters and performances of commercial aramid paper and modified composite paper, including the appearance, microstructure, mechanical properties, dielectric properties and moisture absorption properties, were tested and characterized in detail. The results show that, the tensile strength of the composite paper can reach more than 80 MPa, far exceeding that of the unmodified commercial aramid paper. Furthermore, the composite paper exhibited low dielectric constant (1.90) and dielectric loss (0.01). The surface hydrophobicity and moisture resistance of composite aramid paper have been significantly improved when compared with the commercial aramid paper. Based on the method proposed in this work, the composite aramid paper has excellent characteristics such as low dielectric constant, hydrophobicity and low moisture absorption, and is expected to meet the strict requirements for aramid paper materials in multiple fields in the future. Furthermore, the technological process of this paper is relatively simple and is expected to be applied in industrial production in the future.

芳纶纸具有优异的机械性能、耐热性和电绝缘性能，具有广泛的应用前景。但传统芳纶纸仍存在易吸湿、介电常数高等问题，在一定程度上限制了其在5G/6G通信、可穿戴柔性设备等新领域的应用。本文制备了含氟间位芳纶溶液。采用不同浓度的含氟间位芳纶溶液对商品芳纶纸进行刮涂。最后，对含氟芳纶溶液进行干燥处理，得到了一系列芳纶纸。对商用芳纶纸和改性复合纸的外观、微观结构、力学性能、介电性能和吸湿性能等基本参数和性能进行了测试和表征。结果表明，复合纸的抗拉强度可达80 MPa以上，远远超过未改性的商用芳纶纸。此外，复合纸具有较低的介电常数（1.90）和介电损耗（0.01）。与普通芳纶纸相比，复合芳纶纸的表面疏水性和耐湿性有了明显提高。基于本文提出的方法，复合芳纶纸具有低介电常数、疏水性、低吸湿性等优异特性，有望满足未来多个领域对芳纶纸材料的严格要求。此外，本文的工艺流程相对简单，有望在未来的工业生产中得到应用。

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引用次数: 0

Janus particles stabilized waterborne epoxy coatings for switchable electromagnetic manipulation 用于可切换电磁操作的Janus颗粒稳定水性环氧涂料

IF 9.8 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-11-07 DOI: 10.1016/j.compscitech.2025.111443

Chao Jiang , Pei-Zhu Jiang , Hao-Bin Zhang , Xiaoqing Liu , Fuxin Liang

Modern electronic communication requires ideal electromagnetic manipulation materials urgently to guarantee the high quality of communication and the stable function of electronic devices. Thin epoxy-based composite coatings are potential candidates that are still limited by the efficiency and convenience of building functional filler networks inside. Sustainable development also calls for new techniques to prepare the waterborne epoxy coatings, especially those with multiple functions. Here, an efficient and general method was developed to fabricate multifunctional waterborne epoxy coatings based on the amphiphilic Janus particles (JPs) stabilized Pickering emulsion. JPs were used to stabilize the oil-in-water epoxy emulsions and were anchored at the interface. Thereafter, JPs remained at the interface and resulted in a characteristic bilayer JPs network. This JP's network acts as the platform for functions or assistance to build a conductive MXene nanosheet network. The conductive network is in the morphology of a coverage-adjustable cage by varying the content of fillers. Electromagnetic manipulation performance of the coatings is thus switchable between wave absorbing and interference shielding as the conductive network shifts between a defective-cage and a closed-cage structure. The minimum reflection loss at 1.8 mm reached −25 dB in the absorbing on state and the total electromagnetic interference shielding effectiveness reached 23 dB in the shielding on state.

现代电子通信迫切需要理想的电磁操纵材料，以保证高质量的通信和电子设备的稳定功能。薄环氧基复合涂料是潜在的候选者，但仍然受到内部构建功能性填料网络的效率和便利性的限制。可持续发展对水性环氧涂料特别是多功能水性环氧涂料的制备提出了新的要求。本文研究了一种基于两亲性Janus颗粒（JPs）稳定皮克林乳液制备多功能水性环氧涂料的方法。JPs用于稳定水包油环氧乳液，并锚定在界面处。此后，jp一直停留在界面上，形成了具有特征的双层jp网络。该JP的网络作为功能平台或辅助平台来构建导电的MXene纳米片网络。通过改变填充物的含量，导电网络呈覆盖可调笼状。因此，当导电网络在缺陷笼和封闭笼结构之间转换时，涂层的电磁操纵性能可以在吸波和屏蔽干扰之间切换。在吸收导通状态下，1.8 mm处的最小反射损耗达到−25 dB，在屏蔽导通状态下，总电磁干扰屏蔽效能达到23 dB。

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引用次数: 0

A novel PEO-based composite solid-state electrolyte modified by ion conducting Cr3C2 for lithium metal batteries 锂金属电池用离子导电Cr3C2改性peo基复合固态电解质

IF 9.8 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2025-11-07 DOI: 10.1016/j.compscitech.2025.111432

Rui Cao , Haihua Wang , Yong-Mook Kang , Chaoxian Chen

PEO-based polymer solid-state electrolytes have attracted significant traction in solid-state lithium metal batteries owing to their flexibility and preeminent lithium ions transfer capability. However, their progress has been constrained by limited ion conductivity, poor mechanical properties, and unstable interfaces. In this study, we incorporated the inorganic filler Cr₃C₂ into PEO and blended it with the plasticizer succinonitrile (SN), thereby developing PEO-based composite solid-state electrolytes (CSSEs) that exhibit superior electrochemical performance. The synergistic effect of Cr₃C₂ and PEO restricts the movement of lithium salt anions through chemical bonds, thereby creating more active space for efficient lithium-ion transport and improving the lithium transference number (t_Li+). The PCN5 CSSEs exhibits excellent room temperature lithium-ion migration of 0.96 and superior ionic conductivity over an extensive temperature range (25 °C–80 °C). Moreover, the LFP|PCN5|Li cell delivers discharge capacity of 165.3 mAh g⁻¹ and retains 70.6 % of its original capacity after 500 cycles when tested at 60 °C. Furthermore, the Li|PCN5|Li cell operates stably over 5000 h at a current density of 0.1 mA cm⁻² owing to the improved mechanical properties from hydrogen bonding between Cr₃C₂ and PEO along with lithium dendrites suppressing effect of SN, which ensures long-term cycling performance. These results may position the PCN5 CSSEs as a viable option for next-generation solid-state lithium metal batteries.

peo基聚合物固态电解质由于其灵活性和优异的锂离子传输能力，在固态锂金属电池中引起了很大的关注。然而，它们的进展受到离子电导率有限、机械性能差和界面不稳定的限制。在本研究中，我们将无机填料Cr3C2加入到PEO中，并与增塑剂丁二腈（SN）共混，从而开发出具有优异电化学性能的PEO基复合固态电解质（csse）。Cr3C2与PEO的协同作用限制了锂盐阴离子通过化学键的移动，从而为锂离子的高效传递创造了更活跃的空间，提高了锂离子转移数（tLi+）。PCN5 cses在室温下的锂离子迁移率为0.96，在广泛的温度范围内（25°C - 80°C）具有优异的离子电导率。此外，LFP|PCN5|锂电池在60°C下测试时，放电容量为165.3 mAh g - 1，在500次循环后保持其原始容量的70.6%。此外，由于Cr3C2和PEO之间的氢键作用以及SN对锂枝晶的抑制作用，Li|PCN5|锂电池在0.1 mA cm−2的电流密度下稳定运行了5000 h以上，从而保证了锂枝晶的长期循环性能。这些结果可能使PCN5 cses成为下一代固态锂金属电池的可行选择。

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