Composites Science and Technology最新文献_第4页

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。

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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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引用次数: 0

Process–structure–property relation for elastoplastic behavior of polymer nanocomposites with agglomerates and interfacial gradients 具有团聚体和界面梯度的聚合物纳米复合材料弹塑性行为的工艺-结构-性能关系

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

Composites Science and Technology

Pub Date : 2025-11-06 DOI: 10.1016/j.compscitech.2025.111435

Prajakta Prabhune , Anlan Chen , Yigitcan Comlek , Wei Chen , L. Catherine Brinson

Polymer nanocomposites, inherently tailorable materials, are potentially capable of providing higher strength to weight ratio than conventional hard metals. However, their disordered nature makes processing control and hence tailoring properties to desired target values a challenge. Additionally, the interfacial region, also called the interphase, is a critical material phase in these heterogeneous materials and its extent depends on variety of microstructure features like particle loading and dispersion or inter-particle distances. Understanding process–structure–property (PSP) relation can provide guidelines for process and constituents’ design. Our work explores nuances of PSP relation for polymer nanocomposites with attractive pairing between particles and the bulk polymer. Past works have shown that particle functionalization can help tweak these interactions in attractive or repulsive type and can cause slow or fast decay of stiffness properties in polymer nanocomposites. In this work, we develop a material model that can represent decay for small strain elastoplastic (Young’s modulus and yield strength) properties in interfacial regions and simulate representative or statistical volume element behavior. The interfacial elastoplastic material model is devised by combining local stiffness and glass transition measurements from atomic force microscopy and fluorescence microscopy. This model is combined with a microstructural design of experiments for agglomerated nanocomposite systems. Agglomerations are particle aggregations arising from processing artifacts. Twin screw extrusion process can reduce extent of aggregation in hot pressed samples via erosion or rupture depending on screw rpms and torque. We connect this process–structure relation to structure–property relation that emerges from our study. We discover that balancing between local stress concentration zones (SCZ) and interfacial property decay governs how fast yield stress can improve by breaking down agglomeration via erosion. Erosion is relatively more effective in helping improve nanocomposite yield strength. We also observe saturation in properties where incremental increase brought on by erosion is slowed due to increasing SCZ and saturation in interphase percolation.

聚合物纳米复合材料是一种固有的可定制材料，具有比传统硬金属提供更高强度重量比的潜力。然而，它们的无序性使得处理控制和裁剪属性到期望的目标值成为一项挑战。此外，界面区域，也称为界面相，是这些非均质材料中的关键材料相，其程度取决于各种微观结构特征，如颗粒负载和分散或颗粒间距离。理解工艺-结构-性能（PSP）关系可以为工艺和部件的设计提供指导。我们的工作探讨了聚合物纳米复合材料的PSP关系的细微差别，粒子和体聚合物之间有吸引力的配对。过去的研究表明，粒子功能化可以帮助将这些相互作用调整为吸引或排斥类型，并可能导致聚合物纳米复合材料的刚度性能缓慢或快速衰减。在这项工作中，我们开发了一个材料模型，可以表示界面区域的小应变弹塑性（杨氏模量和屈服强度）特性的衰减，并模拟代表性或统计体积元行为。结合原子力显微镜和荧光显微镜的局部刚度和玻璃化转变测量，设计了界面弹塑性材料模型。该模型结合了团聚纳米复合材料体系的微观结构实验设计。聚集是由加工工件产生的粒子聚集。双螺杆挤压工艺可以减少热压样品中因螺杆转速和扭矩不同而产生的侵蚀或破裂的聚集程度。我们将这种过程-结构关系与我们研究中出现的结构-性质关系联系起来。我们发现，局部应力集中区（SCZ）和界面性能衰减之间的平衡决定了通过侵蚀破坏团聚体来提高屈服应力的速度。在提高纳米复合材料屈服强度方面，侵蚀作用相对更有效。我们还观察到，由于侵蚀带来的增量增加由于增加的SCZ和相间渗透的饱和度而减慢了性质的饱和。

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引用次数: 0

Direct electroplating of CFRP composite laminates assisted by laser surface modification 激光表面改性辅助CFRP复合材料层合板的直接电镀

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

Composites Science and Technology

Pub Date : 2025-11-06 DOI: 10.1016/j.compscitech.2025.111431

Jiashu Sheng , Kai Luo , Xiaochong Wang , Zhi Han , Quanzhou Yao , Lin Ye

Carbon fiber-reinforced polymer (CFRP) are widely used across various industries, including aerospace, automotive, and electronics, owing to their exceptional mechanical properties and superior strength-to-weight ratios. The present study endeavors to overcome the inherent electrical conductivity limitation of epoxy resin-based CFRPs by achieving direct electroplating onto the surface of CFRP laminates. This approach facilitates the development of multifunctional applications that necessitate high surface electrical or thermal conductivity. To this end, a laser ablation technique is introduced to remove the resin-rich layer on the CFRP surface. Subsequently, a conventional copper electroplating method is employed to deposit a robust and continuous coating onto the CFRP laminate surface. The impact of laser ablation parameters on both the CFRP laminate and the subsequent electroplating process is meticulously analyzed, utilizing scanning electron microscopy to assess morphology characteristics. The optimal copper coating demonstrates remarkable electrical conductivity, exhibiting an electrical resistance that is only one order of magnitude higher than that of pure copper film. Furthermore, out-of-plane thermal conductivity enhancements of

133.7 %

and

151.2 %

are observed at

30 °C

and

75 °C

, respectively, compared to the untreated CFRP laminate.

碳纤维增强聚合物（CFRP）由于其卓越的机械性能和卓越的强度重量比，被广泛应用于各个行业，包括航空航天，汽车和电子产品。本研究试图克服环氧树脂基CFRP固有的导电性限制，实现在CFRP层压板表面直接电镀。这种方法促进了需要高表面导电性或导热性的多功能应用的发展。为此，采用激光烧蚀技术去除CFRP表面的富树脂层。随后，采用传统的镀铜方法在CFRP层压板表面沉积坚固且连续的涂层。激光烧蚀参数对CFRP层压板和随后的电镀工艺的影响进行了细致的分析，利用扫描电子显微镜来评估形貌特征。最佳铜涂层表现出卓越的导电性，其电阻仅比纯铜膜高一个数量级。此外，在30°C和75°C时，与未经处理的CFRP层压板相比，面外导热系数分别提高了133.7%和151.2%。

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引用次数: 0

Multi-scale mechanism insight of elastomer toughened thermoplastic composites 弹性体增韧热塑性复合材料的多尺度机理研究

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

Composites Science and Technology

Pub Date : 2025-11-05 DOI: 10.1016/j.compscitech.2025.111434

Zheng Li , Kaiyin Xiao , Tong Li , Bo Wang , Peng Hao , Zebei Mao , Kaifan Du

This study elucidates a multi-applicability mechanism of elastomer-toughened brittle thermoplastics polymers through experimental methods and multiscale analysis. Polyolefin elastomer (POE) and glycidyl methacrylate-modified POE (POE-GMA) were used to toughen thermoplastic polymers polyphenylene sulfide (PPS) and polybutylene terephthalate (PBT). It was found that small amounts of POE-GMA could enhance the fracture energy of PBT and PPS by 167 % and 415 %, while only sacrificing 5.3 %–11.6 % of strength or rigidity, and the lower the inherent toughness of the polymer, the better the toughening effect, whereas POE showed no significant effect. Molecular dynamics simulations indicate that the GMA groups enhance interactions between POE-GMA and polymers, promoting POE-GMA diffusion into the polymer matrix and improving dispersion. Further finite element modeling indicates that smaller and more dispersed elastomer particles can induce more microcracks, enhancing energy absorption and consequently increasing the fracture energy, thereby improving toughness. This multi-applicability mechanism provides crucial insights for designing polymer composites that balance toughness and rigidity.

本研究通过实验方法和多尺度分析，阐明了弹性体增韧脆性热塑性聚合物的多适用机理。采用聚烯烃弹性体（POE）和甲基丙烯酸缩水甘油酯改性POE （POE- gma）对热塑性聚合物聚苯硫醚（PPS）和聚对苯二甲酸丁二酯（PBT）进行增韧。结果表明，少量POE- gma可使PBT和PPS的断裂能分别提高167%和415%，而强度或刚度仅损失5.3% - 11.6%，聚合物的固有韧性越低，增韧效果越好，POE的增韧效果不显著。分子动力学模拟表明，GMA基团增强了POE-GMA与聚合物之间的相互作用，促进了POE-GMA向聚合物基体的扩散，改善了聚合物的分散性。进一步的有限元模拟表明，弹性体颗粒越小、越分散，产生的微裂纹越多，增强了能量吸收，从而提高了断裂能，从而提高了韧性。这种多用途机制为设计平衡韧性和刚性的聚合物复合材料提供了重要的见解。

{"title":"Multi-scale mechanism insight of elastomer toughened thermoplastic composites","authors":"Zheng Li , Kaiyin Xiao , Tong Li , Bo Wang , Peng Hao , Zebei Mao , Kaifan Du","doi":"10.1016/j.compscitech.2025.111434","DOIUrl":"10.1016/j.compscitech.2025.111434","url":null,"abstract":"<div><div>This study elucidates a multi-applicability mechanism of elastomer-toughened brittle thermoplastics polymers through experimental methods and multiscale analysis. Polyolefin elastomer (POE) and glycidyl methacrylate-modified POE (POE-GMA) were used to toughen thermoplastic polymers polyphenylene sulfide (PPS) and polybutylene terephthalate (PBT). It was found that small amounts of POE-GMA could enhance the fracture energy of PBT and PPS by 167 % and 415 %, while only sacrificing 5.3 %–11.6 % of strength or rigidity, and the lower the inherent toughness of the polymer, the better the toughening effect, whereas POE showed no significant effect. Molecular dynamics simulations indicate that the GMA groups enhance interactions between POE-GMA and polymers, promoting POE-GMA diffusion into the polymer matrix and improving dispersion. Further finite element modeling indicates that smaller and more dispersed elastomer particles can induce more microcracks, enhancing energy absorption and consequently increasing the fracture energy, thereby improving toughness. This multi-applicability mechanism provides crucial insights for designing polymer composites that balance toughness and rigidity.</div></div>","PeriodicalId":283,"journal":{"name":"Composites Science and Technology","volume":"274 ","pages":"Article 111434"},"PeriodicalIF":9.8,"publicationDate":"2025-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145518876","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

Comparison of flexural properties of two different CFRPs before and after low-velocity impact: T1000 vs T300 interleaved with micro-/nano- Aramid fibers T1000与T300与微/纳米芳纶纤维交织低速冲击前后两种不同cfrp抗弯性能的比较

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

Composites Science and Technology

Pub Date : 2025-11-04 DOI: 10.1016/j.compscitech.2025.111428

Mingxin Ye , Yabin Deng , Yunsen Hu , Xiaozhi Hu

T1000 carbon fibers are far superior to T300 fibers in tension, but the performance of bulk T1000 composites can be matched by bulk T300 composites interleaved with sparsely distributed micro-/nano- Aramid pulp (AP) fibers. In this study, we focus not only on the short-beam shear strength but also on the flexural strength of T1000 and T300-AP composites before and after impact, as these properties are critical indicators of structural performance under bending-dominated loading conditions. Maintaining the AP-epoxy interlayer thickness increase at 8 μm or less, with AP areal densities of 2, 4 and 6 g/m², leads to improvements of up to 38 % in short-beam shear strength and 55 % in flexural strength for the T300-AP composites, surpassing the performance of plain T1000 composites without such AP-interfacial toughening. These findings highlight the importance of interfacial design and quasi-Z-directional fiber bridging in CFRPs, demonstrating that resin-rich layers between carbon fiber plies as thin as 15 μm can be transformed into mechanically interlocked ply interfaces through AP-interfacial toughening, thereby bringing the structural performance of T300-AP composites to parity with that of T1000 composites.

T1000碳纤维在拉伸性能上远优于T300纤维，但块状T1000复合材料与稀疏分布的微/纳米芳纶纸浆（AP）纤维交织，其性能可以与块状T300复合材料相媲美。在本研究中，我们不仅关注了T1000和T300-AP复合材料的短梁抗剪强度，还关注了T1000和T300-AP复合材料在冲击前后的抗弯强度，因为这些性能是在弯曲主导载荷条件下结构性能的关键指标。当AP面密度分别为2、4和6 g/m2时，将AP-环氧树脂层间厚度增加在8 μm或以下，T300-AP复合材料的短束抗剪强度和抗弯强度分别提高了38%和55%，超过了未进行AP-界面增韧的普通T1000复合材料的性能。这些发现强调了界面设计和准z方向纤维桥接在cfrp中的重要性，表明薄至15 μm的碳纤维层之间的富树脂层可以通过ap -界面增韧转变为机械互锁的层界面，从而使T300-AP复合材料的结构性能与T1000复合材料相当。

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引用次数: 0