Composites Science and Technology最新文献_第7页

Boosting high-temperature capacitive energy storage in PEI-based composite dielectric using dual-functional fluorinated graphene 利用双功能氟化石墨烯增强pei基复合电介质的高温电容储能

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

Composites Science and Technology

Pub Date : 2026-03-01 Epub Date: 2025-12-22 DOI: 10.1016/j.compscitech.2025.111495

Rui Yang , Zhongyao Chai , Yi Ru , Wenqi Zhang , Sidi Fan , Yaping Cui , Fangcheng Lv , Xiang Yu

Polymer-based thin-film capacitors have emerged as essential components in advanced energy generation and storage systems. For high-temperature applications, conventional polymers, such as polyetherimide (PEI), still face a critical challenge: a surge in leakage current at high temperatures, which degrades both discharge efficiency (η) and discharge energy density (U_d). Here, we report on the development of PEI-based composite dielectrics reinforced with fluorinated graphene (F-gr), exhibiting remarkable high-temperature energy storage performance. F-gr plays a dual-functional role: acting as a “chain binder” to form an electrostatic cross-linking network with the PEI chains, thereby restricting thermally activated segment motion and reducing leakage current; serving as an interfacial trapping center that further minimizes leakage current to levels one order of magnitude lower than that of the PEI film. At an optimized doping ratio of 0.3 wt%, the composite film achieves a maximum U_d of 6.31 J cm⁻³ at 150 °C and 4.43 J cm⁻³ at 200 °C. At an efficiency above 90 %, the 0.3 wt% film retains a U_d of 5.32 J cm⁻³ at 150 °C and 3.18 J cm⁻³ at 200 °C, representing 127.35 % and 825.29 % enhancements, respectively, compared to the PEI film. Furthermore, its excellent long-term operational stability and scalability potential highlight its feasibility for practical applications.

聚合物薄膜电容器已成为先进能源生产和存储系统的重要组成部分。对于高温应用，传统聚合物，如聚醚酰亚胺（PEI），仍然面临着一个严峻的挑战：高温下泄漏电流激增，这会降低放电效率（η）和放电能量密度（Ud）。在这里，我们报告了氟化石墨烯（F-gr）增强pei基复合电介质的发展，具有显着的高温储能性能。F-gr具有双重功能：作为“链粘合剂”，与PEI链形成静电交联网络，从而限制热激活节段运动，减少漏电流；作为一个界面捕获中心，进一步将泄漏电流降至比PEI薄膜低一个数量级的水平。当掺杂比为0.3 wt%时，复合膜在150°C和200°C时的最大Ud分别为6.31 J cm−3和4.43 J cm−3。在效率高于90%的情况下，0.3 wt%的膜在150°C和200°C下的Ud分别为5.32 J cm−3和3.18 J cm−3，与PEI膜相比，分别提高了127.35%和825.29%。此外，其良好的长期运行稳定性和可扩展性也突出了其实际应用的可行性。

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引用次数: 0

Enhancing CAI strength via ultra-thin/thick ply gradient design: Inhibiting impact delamination and inducing damage competition 通过超薄/厚厚度梯度设计增强CAI强度：抑制冲击分层和诱导损伤竞争

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

Composites Science and Technology

Pub Date : 2026-03-01 Epub Date: 2025-12-10 DOI: 10.1016/j.compscitech.2025.111485

Xiaofang Zhang , Yanan Yuan

Traditional thick-ply composites exhibit significant susceptibility to delamination under impact loading, presenting critical challenges to higher mechanical performance. Superior delamination resistance of ultra-thin-ply composites has been proven. We have attempted for the first time to conduct low-velocity impact (LVI) and compression-after-impact (CAI) test using ultra-thin-ply layer under thickness gradient and hybrid design, which is expected to inhibit impact delamination and induced damage competition mechanism, thereby improving CAI strength. Experimental results have proven that the gradient structure with ultra-thin-ply effectively reduces the delamination risk under LVI test and the energy dissipated mechanism transformation has been observed. Compared with thick-ply laminates dominated by delamination, the gradient structure exhibits increased energy distribution for fiber fracture and and the ultimate failure mode is the competition mode between delamination and fiber fracture. Notably, the gradient design imparts more comprehensive mechanical properties to FG-43211234 (a thickness gradient design incorporating four distinct ply thicknesses), manifested in smaller impact depths and superior CAI strength. Furthermore, this study elucidates the damage mechanism of CAI performance: uniform-ply composites exhibit single damage control, with thin-ply structure mainly experiences kink-band failure, while thick-ply structure is primarily characterized by delamination failure. The gradient structure exhibits a damage mechanism competition between kink-band and delamination. The thickness gradient design significantly improves damage tolerance by impeding through-thickness damage propagation, thereby offering enhanced design possibilities and approaches for applications demanding superior damage resistance.

传统的厚层复合材料在冲击载荷下易发生分层，这对提高机械性能提出了严峻的挑战。超薄层复合材料具有优异的抗分层性能。我们首次尝试采用厚度梯度和混合设计的超薄层进行低速冲击（LVI）和冲击后压缩（CAI）试验，期望能抑制冲击分层和诱导损伤竞争机制，从而提高CAI强度。实验结果证明，在LVI试验下，超薄层梯度结构有效降低了分层风险，并观察到了能量耗散机制的转变。与脱层为主的厚层复合材料相比，梯度结构的纤维断裂能量分布增大，最终破坏模式为脱层与纤维断裂的竞争模式。值得注意的是，梯度设计使FG-43211234（包含四种不同厚度的厚度梯度设计）具有更全面的力学性能，表现为更小的冲击深度和更高的CAI强度。进一步阐明了CAI性能的损伤机理：均布复合材料表现为单一的损伤控制，薄层结构以扭结带破坏为主，厚层结构以分层破坏为主。梯度结构表现出扭结带与分层间的竞争损伤机制。厚度梯度设计通过阻止整个厚度的损伤传播，显著提高了损伤容限，从而为要求优异的抗损伤性的应用提供了增强的设计可能性和方法。

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引用次数: 0

Processability, mechanical and high-temperature tribological properties of h-BN/PEEK self-lubricating composites manufactured via laser powder bed fusion 激光粉末床熔合制备的h-BN/PEEK自润滑复合材料的加工性能、力学性能和高温摩擦学性能

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

Composites Science and Technology

Pub Date : 2026-03-01 Epub Date: 2025-12-27 DOI: 10.1016/j.compscitech.2025.111501

Yazhou Li, Lingyun Jian, Hanfei Dai, Hengrui Zhao, Boyu Chen, Qiang Yang, Fu Wang, Dichen Li

Polyether-ether-ketone (PEEK) motion components face significant challenges related to complex structural fabrication and high-temperature lubrication in aerospace and automotive engineering. Additive manufacturing of PEEK-based self-lubricating composites provides an effective solution to these issues. In this study, hexagonal boron nitride (h-BN) was incorporated into PEEK and fabricated via laser powder bed fusion (LPBF) to enhance its mechanical and high-temperature tribological performance. The incorporation of h-BN improves the powder flowability and packing efficiency and promotes the crystallization, thermal conductivity, and mechanical reinforcement of PEEK. The 10 wt% h-BN/PEEK self-lubricating composite exhibits the best overall performance, achieving a compressive strength of 190 MPa, a tensile strength of 90.5 MPa, and a hardness improvement of 11 % compared with pure PEEK. Moreover, the same formulation demonstrated exceptionally low coefficients of friction and wear rates across both ambient and elevated temperatures (100–200 °C), with reductions exceeding 65 % relative to pure PEEK. It is attributed to the easy-shear nature of the layered h-BN and the formation of a continuous transfer film, while molecular dynamics simulations confirm that h-BN promotes interfacial slip, structural stability, and efficient heat dissipation in the composite. This work provides new insights into the design and LPBF fabrication of high-performance polymer-based self-lubricating composites for high-temperature applications in extreme environments.

聚醚醚酮（PEEK）运动部件在航空航天和汽车工程中面临着复杂结构制造和高温润滑方面的重大挑战。peek基自润滑复合材料的增材制造为这些问题提供了有效的解决方案。本研究将六方氮化硼（h-BN）掺入PEEK中，并通过激光粉末床熔接（LPBF）制备，以提高PEEK的机械性能和高温摩擦学性能。h-BN的加入提高了粉末的流动性和填充效率，促进了PEEK的结晶、导热性和机械增强。10 wt%的h-BN/PEEK自润滑复合材料表现出最佳的综合性能，抗压强度为190 MPa，抗拉强度为90.5 MPa，硬度比纯PEEK提高11%。此外，在环境温度和高温（100-200°C）下，相同配方的摩擦系数和磨损率都非常低，与纯PEEK相比，降低幅度超过65%。这归因于层状h-BN的易剪切性质和连续传递膜的形成，而分子动力学模拟证实，h-BN促进了复合材料中的界面滑移、结构稳定性和高效散热。这项工作为在极端环境中高温应用的高性能聚合物基自润滑复合材料的设计和LPBF制造提供了新的见解。

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引用次数: 0

Development of ultra-strong and high barrier polymer membrane with nacre-mimetic structure via sequential pulse cold rolling rheological strategy 采用序贯脉冲冷轧流变策略开发具有纳米结构的超高强度高阻隔聚合物膜

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

Composites Science and Technology

Pub Date : 2026-03-01 Epub Date: 2025-12-11 DOI: 10.1016/j.compscitech.2025.111487

Senhao Zhang, Tongkun Wang, Cong Ye, Jincai Cheng, Huanhuan Zhang, Jin-Ping Qu

Following the COVID-19 pandemic, the demand for materials with superior barrier and mechanical properties has surged. Mechanical processing techniques have been proven effective in facilitating the self-assembly of the nacre-mimetic structure, significantly enhancing the properties of polymer materials. However, these methods often lead to non-uniform strain, which limits the potential reinforcement effects. This study proposes a sequential pulse cold rolling rheological strategy. By applying multiple small-amplitude loads, the relaxation behavior of molecular chains is effectively regulated to minimize non-uniform strain during mechanical processing, thereby enabling the formation of a more uniform nacre-mimetic structure under cold solid-state. The optimized cold-rolled membrane demonstrated an oxygen improvement factor (BIF) of 5.8 and a tensile strength of 59.0 MPa, representing enhancements of 480 % and 470.3 %, respectively, compared to that of the control. The membranes also showed excellent biocompatibility and achieved a 60.24 % inhibition rate against Candida albicans, compared to 24.09 % for the control. In vivo studies demonstrated that by 14 days, the cr-2 achieved a healing rate of 93.05 %, significantly higher than that of the control (83.10 %) and blank (58.34 %). This approach provides a general strategy for mitigating non-uniform strain during machining processes, offering broad applicability in material design and processing.

新型冠状病毒感染症（COVID-19）大流行后，对具有优异阻隔性和机械性能的材料的需求激增。机械加工技术已被证明可以有效地促进纳米结构的自组装，显著提高高分子材料的性能。然而，这些方法往往导致应变不均匀，这限制了潜在的加固效果。本研究提出了一种顺序脉冲冷轧流变策略。通过施加多个小振幅载荷，有效调节分子链的弛豫行为，最大限度地减少机械加工过程中的不均匀应变，从而使冷固态下形成更均匀的纳米模拟结构。优化后的冷轧膜的氧改善因子（BIF）为5.8，抗拉强度为59.0 MPa，分别比对照提高了480%和470.3%。该膜具有良好的生物相容性，对白色念珠菌的抑制率为60.24%，而对照组为24.09%。体内研究表明，到第14天，cr-2的愈合率为93.05%，显著高于对照组（83.10%）和空白组（58.34%）。该方法为减轻加工过程中的非均匀应变提供了一种通用策略，在材料设计和加工中具有广泛的适用性。

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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 : 2026-02-08 Epub 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

An improved and complete closed-form solution for the mixed mode bending test for delamination in composite laminates 复合材料层合板分层混合模弯曲试验的一种改进的完全封闭解

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

Composites Science and Technology

Pub Date : 2026-02-08 Epub Date: 2025-11-26 DOI: 10.1016/j.compscitech.2025.111463

Bo Wang, Zhenmin Zou

Most existing closed-form solutions for the Mixed-Mode Bending (MMB) test, used to investigate the delamination behaviour in laminated composites, are limited to cases where the delamination length a is less than the half-span L of the specimen. More critically, since these solutions are typically derived using beam theory, the predicted mode I and mode II energy release rates become increasingly inaccurate as the delamination approaches the specimen's mid-span. The few available solutions for delamination length a > L are either erroneous or significantly inaccurate. In this study, a complete closed-form solution is developed using a sub-laminated beam model based on first order shear deformation beam theory. The accuracy of the solution is validated through comparison with results obtained from the virtual crack closure technique and cohesive zone model simulations, using 2D finite element analysis. The proposed formulation enables accurate evaluation of energy release rates for a complete delamination length range (a < L and a ≥ L). The solution is also applicable to thick specimens with cross-ply layups. Potentially, this work may help pave the way for permitting delamination propagation beyond the mid-span in the MMB test—an approach that is currently not recommended by the ASTM standard.

用于研究层压复合材料分层行为的混合模式弯曲（MMB）测试中，大多数现有的封闭解仅限于分层长度a小于试样半跨度L的情况。更关键的是，由于这些解通常是用梁理论推导出来的，随着分层接近试件的跨中，预测的I型和II型能量释放率变得越来越不准确。对于分层长度a >； L，少数可用的解决方案要么是错误的，要么是非常不准确的。本文采用基于一阶剪切变形梁理论的亚层合梁模型，建立了完全封闭解。通过与虚拟裂纹闭合技术和黏结区模型模拟结果的对比，验证了该方法的准确性。所提出的公式能够准确地评估整个分层长度范围（a <； L和a≥L）的能量释放率。该解决方案也适用于具有交叉层的厚试件。潜在地，这项工作可能有助于在MMB测试中允许分层传播超过跨中，这是ASTM标准目前不推荐的方法。

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引用次数: 0

Unraveling the interfacial hydrogen bond network mechanism in carbon fiber/polyamide composites: A cross-scale investigation of carbon fiber with different roughness for interface optimization 揭示碳纤维/聚酰胺复合材料界面氢键网络机制：不同粗糙度碳纤维界面优化的跨尺度研究

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

Composites Science and Technology

Pub Date : 2026-02-08 Epub Date: 2025-11-20 DOI: 10.1016/j.compscitech.2025.111453

Rui Zhang , Jieying Zhi , Lijuan Cao , Liye Yuan , Xiaodong Wen , Xingchen Liu , Kuan Lu , Xiaoxuan Lyu , Yu Yang

The interfacial properties of carbon fiber-reinforced thermoplastics are governed by carbon fiber surface characteristics. While the interfacial mechanisms in thermoset composites have been extensively investigated, their thermoplastic counterparts have received comparatively less attention. This research implements a cross-scale methodology integrating macroscopic experiments and molecular dynamics (MD) simulations to elucidate interfacial mechanisms between polyamide 6 (PA6) and two types of carbon fibers with distinct surface states: dry-jet wet-spun carbon fiber (DSCF) and wet-spun carbon fiber (WSCF). Experimental results revealed a notably 55.74 % higher interfacial shear strength (IFSS) in DSCF/PA6 composites (63.20 MPa) compared with WSCF/PA6 systems (40.58 MPa). Through comprehensive microscopic analysis and computational modeling, we found that the enhanced interfacial performance of DSCF stems from its higher concentration of oxygen-containing functional groups, which promote the formation of a more robust hydrogen bond network with PA6 molecules. Building upon this fundamental understanding, we proposed a mesoscale optimization strategy focused on hydrogen bond network regulation. Implementing controlled cooling during composite molding enhanced PA6 crystallinity, leading to a 26.74 % increase in the IFSS of DSCF/PA6 to 80.10 MPa. This work not only clarifies the critical role of hydrogen bonding in interfacial reinforcement but also presents a practical multiscale design framework for DSCF/PA6 composites. The findings offer valuable insights for carbon fiber selection and interface engineering, contributing significantly to the development of advanced carbon fiber-reinforced thermoplastic materials.

碳纤维增强热塑性塑料的界面性能受碳纤维表面特性的影响。虽然热固性复合材料的界面机制已经得到了广泛的研究，但热塑性复合材料的界面机制却相对较少受到关注。本研究采用宏观实验和分子动力学（MD）模拟相结合的跨尺度方法，阐明了聚酰胺6 （PA6）与两种不同表面状态的碳纤维(干喷湿纺碳纤维（DSCF）和湿纺碳纤维（WSCF）之间的界面机理。实验结果表明，DSCF/PA6复合材料的界面抗剪强度（IFSS）为63.20 MPa，比WSCF/PA6复合材料的40.58 MPa高55.74%。通过全面的微观分析和计算建模，我们发现DSCF界面性能的增强源于其含有更高浓度的含氧官能团，这促进了与PA6分子形成更牢固的氢键网络。基于这一基本认识，我们提出了一种以氢键网络调节为重点的中尺度优化策略。在复合成型过程中实施控制冷却提高了PA6的结晶度，导致DSCF/PA6的IFSS提高26.74%，达到80.10 MPa。这项工作不仅阐明了氢键在界面增强中的关键作用，而且为DSCF/PA6复合材料提供了一个实用的多尺度设计框架。这些发现为碳纤维的选择和界面工程提供了有价值的见解，对先进碳纤维增强热塑性材料的发展有重要贡献。

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引用次数: 0

Development of shear-thickening-gel applied carbon fiber reinforced polymer (SACFRP) with enhanced low-velocity impact resistance 碳纤维增强聚合物（SACFRP）抗剪切增稠凝胶的研制

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

Composites Science and Technology

Pub Date : 2026-02-08 Epub Date: 2025-11-29 DOI: 10.1016/j.compscitech.2025.111464

Jianchao Zou , Wanrui Zhang , Zhenhao Liao , Yan Shen , Zhibin Han , Lei Yang , Jinglei Yang , Weizhao Zhang

Conventional carbon fiber-reinforced polymers (CFRPs) are highly susceptible to low-velocity impact (LVI) from sharp objects due to their inherent brittleness. To address this critical limitation, an innovative shear thickening gel (STG) was incorporated into CFRP through a bespoke fabrication process, resulting in the STG-applied CFRP (SACFRP). LVI tests revealed that specific impact strength of the SACFRP increased significantly by 267 % compared to the reference CFRP fabricated with the same carbon fibers and epoxy resin but without STG. Moreover, the SACFRP achieved the specific impact strength of 202 J m/kg, substantially exceeding that of other representative carbon or glass fiber-reinforced polymers. Damage analysis and Timoshenko's theoretical study highlighted distinct failure mechanisms between the SACFRP that exhibited thin-plate elastic flexure and the CFRP that experienced brittle impact failure under LVI. Additionally, ultrasonic C-scan results demonstrated enlarged effective impact-resistant area in the SACFRP due to the viscoelasticity and shear-thickening behavior of the integrated STG, facilitating energy dissipation and reducing brittleness of the composite. In summary, this work presents the manufacturing method of an innovative SACFRP composite and demonstrates its outstanding impact resistance, marking the significant advancement in development of high-performance composites.

传统的碳纤维增强聚合物（CFRPs）由于其固有的脆性，极易受到尖锐物体的低速冲击（LVI）。为了解决这一关键限制，一种创新的剪切增厚凝胶（STG）通过定制的制造工艺加入到CFRP中，从而产生了STG应用的CFRP （SACFRP）。LVI试验表明，SACFRP的比冲击强度比采用相同碳纤维和环氧树脂但不添加STG的参考CFRP提高了267%，达到202 J m/kg的比冲击强度，大大超过了其他代表性的碳或玻璃纤维增强聚合物。损伤分析和Timoshenko的理论研究强调了在LVI下SACFRP表现出薄板弹性弯曲和CFRP经历脆性冲击破坏的不同破坏机制。此外，超声c扫描结果显示，由于集成STG的粘弹性和剪切增厚行为，SACFRP的有效抗冲击面积扩大，有利于能量耗散，降低复合材料的脆性。总之，这项工作提出了一种创新的SACFRP复合材料的制造方法，并展示了其出色的抗冲击性，标志着高性能复合材料的发展取得了重大进展。

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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 : 2026-02-08 Epub 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

Microscopic mechanism of interfacial effects on mechanical properties of polymer nanocomposites 界面效应对聚合物纳米复合材料力学性能影响的微观机理

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

Composites Science and Technology

Pub Date : 2026-02-08 Epub Date: 2025-11-21 DOI: 10.1016/j.compscitech.2025.111458

Xiaobin Liang , Toru Kobayashi , Tatsuya Endo , Makiko Ito , Ken Nakajima

Interfaces play a crucial role in the mechanical properties and deformation behavior of polymer nanocomposites (PNCs). In this study, we successfully characterized the deformation behavior and stress distribution of the interface and polymer matrix at the nanoscale using the nanomechanical technique of atomic force microscopy (AFM), revealing the microscopic mechanism of the interface effects on the mechanical properties of PNCs. By comparing the interfaces of different fillers and styrene-butadiene rubber (SBR), we found that silane coupling agent-treated silica (SiO₂) could greatly increase the interface thickness and strength. This enhancement was not limited to the interface itself but also restricted the movement of molecular chains nearby, thereby increasing the modulus of the surrounding matrix. When the material was deformed, the high-strength interface could bear a large amount of stress, while the stresses in composites with low interfacial strength were mainly borne by the polymer matrix. This microscopic stress visualization technique enabled a deeper understanding of the correlation between the micromechanical behavior and macroscopic mechanical properties of the interface and matrix. In addition, through the quantitative analysis of the stress distribution of each phase, we proposed a multiphase composite model to describe the deformation behavior of filled rubber. We used the parallel model and the series model to calculate the composite stress of different types of filler PNCs, further reveals the importance of the interface for the mechanical properties of PNCs. Our results provided new insights for guiding the design and development of PNCs and for the study of composite interfaces.

界面对聚合物纳米复合材料的力学性能和变形行为起着至关重要的作用。在本研究中，我们利用原子力显微镜（AFM）纳米力学技术成功表征了界面和聚合物基体在纳米尺度上的变形行为和应力分布，揭示了界面效应对pnc力学性能的微观机制。通过对比不同填料与SBR的界面，发现硅烷偶联剂处理的二氧化硅（SiO2）可以显著提高界面厚度和强度。这种增强不仅限于界面本身，而且还限制了附近分子链的运动，从而增加了周围基质的模量。当材料发生变形时，高强度界面可以承受大量的应力，而低强度界面的复合材料中的应力主要由聚合物基体承担。这种微观应力可视化技术使人们能够更深入地了解界面和基体的微观力学行为与宏观力学性能之间的关系。此外，通过定量分析各相的应力分布，提出了描述填充橡胶变形行为的多相复合模型。采用并联模型和串联模型计算了不同类型填料pnc的复合应力，进一步揭示了界面对pnc力学性能的重要性。研究结果为指导pnc的设计和开发以及复合界面的研究提供了新的见解。

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