Composites Science and Technology最新文献_第4页

Recyclable and highly thermally conductive nanocomposite with binary thermally conductive networks constructed from boron nitride nanoribbons and nanosheets 由氮化硼纳米带和纳米片构建的具有二元导热网络的可回收高导热纳米复合材料

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

Composites Science and Technology

Pub Date : 2024-11-04 DOI: 10.1016/j.compscitech.2024.110954

Liyuan Guo , Lei Feng , Caiyue Huang , Qiang Song , Peng Wei , Dongfang Xu , Mengdan Hou , Haojie Song

Technological advances have accelerated the development of high-performance insulation-based Thermal Interface Materials (TIMs), leading to increased generation of electronic waste. A significant challenge is the development of recyclable TIMs with superior thermal conductivity. Hemiaminal dynamic covalent network (HDCN) polymers are considered as an ideal matrix material for recyclable TIMs due to their high degradability at low pH (pH < 2). In this work, binary thermally conductive paths of hexagonal boron nitride nanoribbons (BNNRs) and boron nitride nanosheets (BNNSs) are introduced into the HDCN to improve the thermal conductivity of HDCN without sacrificing its electrically insulating properties. The functional BNNSs (f-BNNSs) are attached onto the surfaces of BNNRs to achieve the homogeneous distribution of nanosheets within the HDCN. Benefiting from the binary thermally conductive paths, an excellent in-plane thermal conductivity of 3.12 W m⁻¹K⁻¹ for BNNS-BNNR/HDCN nanocomposite is achieved at a BN loading of 14 wt% (containing 2 wt% BNNRs and 12 wt% f-BNNS), increased by 1299 % comparing to the pure HDCN polymer, as well as superior to those reported for polymer composites with similar loading of BNNRs or BNNSs. Additionally, the nanocomposite demonstrated efficient recyclability of BNNSs and BNNRs hybrid fillers in an acidic environment (pH < 2) at 25 °C with a recycling efficiency of 82 %. Notably, the nanocomposite exhibited noteworthy electrical insulation properties. This study demonstrates the potential of BNNS-BNNR/HDCN as a recyclable TIMs and provides a new idea for the future research and development of recyclable high performance TIMs.

技术进步加速了高性能绝缘热界面材料（TIM）的发展，导致电子废物的产生量增加。开发具有优异导热性能的可回收 TIM 是一项重大挑战。半膜动态共价网络（HDCN）聚合物在低 pH 值（pH 值为 2）下具有高降解性，因此被认为是可回收 TIM 的理想基体材料。在这项工作中，六方氮化硼纳米带（BNNRs）和氮化硼纳米片（BNNSs）的二元导热路径被引入到 HDCN 中，以提高 HDCN 的热导率，同时不牺牲其电绝缘特性。功能性 BNNSs（f-BNNSs）附着在 BNNRs 表面，以实现纳米片在 HDCN 中的均匀分布。得益于二元导热路径，BNNS-BNNR/HDCN 纳米复合材料在 BN 含量为 14 wt%（含 2 wt% BNNRs 和 12 wt% f-BNNS）时实现了 3.12 W m-1K-1 的优异面内导热率，与纯 HDCN 聚合物相比提高了 1299%，也优于已报道的具有类似 BNNRs 或 BNNSs 含量的聚合物复合材料。此外，该纳米复合材料还证明了 BNNSs 和 BNNRs 混合填料在 25 °C 的酸性环境（pH 值为 2）中的高效可回收性，回收效率高达 82%。值得注意的是，该纳米复合材料还具有显著的电绝缘性能。这项研究证明了 BNNS-BNNR/HDCN 作为可回收 TIMs 的潜力，并为未来研究和开发可回收的高性能 TIMs 提供了新思路。

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引用次数: 0

Room-temperature ionic liquid electrolytes for carbon fiber anodes in structural batteries 用于结构电池中碳纤维阳极的室温离子液体电解质

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

Composites Science and Technology

Pub Date : 2024-11-03 DOI: 10.1016/j.compscitech.2024.110952

Lakshmi Surag Singavarapu , Paul Gilmore , Jun Wei Yap , Yehia Khalifa , Umesh Gandhi , Timothy S. Arthur , Jay Sayre , Jung-Hyun Kim

Structural batteries require thermally stable electrolytes paired with carbon fibers (CFs), which offer advantages of lightweight, high mechanical strength, and good electrical conductivity. This work evaluated various room-temperature ionic-liquids (RTILs) as compatible electrolytes for CF anodes and LiFePO₄ (LFP) cathodes on CFs. This LFP/CF full-cell design eliminates Cu and Al current-collectors, potentially enhancing gravimetric energy and reducing costs. Among various RTILs, LiTFSI in N-propyl-N-methylpyrrolidinium (PYR13) – bis(fluorosulfonyl)imide (FSI) offered promising LFP/CF full-cell performances, attributed to the formation of solid electrolyte interphase (SEI) layer on the CF anode with components such as Li₂S_x, Li₂S–SO₃, LiF, Li_xF_y and F–SO₂, identified through X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). Electrochemical impedance spectroscopy (EIS) and distribution of relaxation times (DRT) analyses further confirmed the electrochemical stability of the SEI layer on CF anodes. The LFP/CF cell delivered an initial capacity of 119 mAh/g and relatively high Coulombic efficiency when using the 1 M LiTFSI in PYR13-FSI. CF cycled in different electrolytes exhibit varying mechanical properties with up to 10.08 % loss in tensile strength, which may be related to CF surface degradation during cycling. The 1 M LiTFSI in PYR13-FSI is non-flammable, offering a significant thermal safety. This work successfully demonstrated the significant potential of 1 M LiTFSI in PYR13-FSI RTILs, which enables the use of CF as both an anode active material and cathode current collector for structural battery applications.

结构电池需要与碳纤维（CF）配对的热稳定电解质，碳纤维具有重量轻、机械强度高和导电性好等优点。这项研究评估了各种室温离子液体（RTIL）作为 CF 阳极和 CF 上磷酸铁锂（LFP）阴极的兼容电解质。这种 LFP/CF 全电池设计消除了铜和铝集流器，有可能提高重力能量并降低成本。在各种 RTIL 中，N-丙基-N-甲基吡咯烷铵（PYR13）-双（氟磺酰）亚胺（FSI）中的 LiTFSI 具有良好的 LFP/CF 全电池性能、通过 X 射线光电子能谱 (XPS) 和扫描电子显微镜 (SEM)，可以确定 CF 阳极上形成了固体电解质相间层 (SEI)，其中含有 Li2Sx、Li2S-SO3、LiF、LixFy 和 F-SO2 等成分。电化学阻抗光谱（EIS）和弛豫时间分布（DRT）分析进一步证实了 CF 阳极 SEI 层的电化学稳定性。在PYR13-FSI 中使用 1 M LiTFSI 时，LFP/CF 电池的初始容量为 119 mAh/g，库仑效率相对较高。在不同电解质中循环使用的 CF 显示出不同的机械性能，拉伸强度损失高达 10.08%，这可能与循环过程中 CF 表面降解有关。PYR13-FSI中的1 M LiTFSI是不可燃的，具有显著的热安全性。这项研究成功证明了PYR13-FSI RTIL 中 1 M LiTFSI 的巨大潜力，这使得 CF 既可用作结构电池应用的阳极活性材料，也可用作阴极集流器。

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引用次数: 0

Three-dimensional cohesive finite element simulations coupled with machine learning to predict mechanical properties of polymer-bonded explosives 三维内聚有限元模拟与机器学习相结合，预测聚合物粘合炸药的机械特性

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

Composites Science and Technology

Pub Date : 2024-11-02 DOI: 10.1016/j.compscitech.2024.110947

Daokun Lu , Bingru Zhang , Liu Liu , Haitao Zhang , Luoxia Cao , Yang Zhou

Developing multifactorial predictive models for the design of polymer-bonded explosives (PBXs) is of importance for their further application in insensitive munition fields. As a popular method, finite element simulations can provide a reliable prediction, but are laborious and expensive if considering the extensive design parameter space. In light of this challenge, we proposed a coupled strategy that includes machine learning (ML) and three-dimensional cohesive finite element simulation for effciently predicting the mechanical properties of PBXs. The strain rate, particle volume fraction, interface strength, fracture energy, and the binders are considered as the main factors of tailoring the tensile strength of PBXs. To improve the prediction performance, an augmented database of 2500 data sets utilizing GANs neural network were established and then processed to train and test six ML models. The results show the accuracy and generalizability of the low-computational-cost ML models in predicting the mechanical properties of PBX composites. The predicted values from these models are in good agreement with the experimental ones. Feature contribution analysis demonstrates that the tensile modulus and failure strain are most affected by the binders, while the tensile strength are most affected by the fracture energy. Using the above conclusions as design guidelines, we can develop the new PBX formulations according to different mechanical property requirements for their optimal use across insensitive ammunitions. This strategy can be a viable machine-learning-assisted solution to designing PBXs.

为聚合物粘结炸药（PBX）的设计开发多因素预测模型对其在非敏感弹药领域的进一步应用具有重要意义。作为一种常用方法，有限元模拟可以提供可靠的预测，但如果考虑到广泛的设计参数空间，这种方法既费力又昂贵。有鉴于此，我们提出了一种包含机器学习（ML）和三维内聚有限元模拟的耦合策略，用于有效预测 PBX 的机械性能。应变率、颗粒体积分数、界面强度、断裂能和粘合剂被视为定制 PBX 拉伸强度的主要因素。为了提高预测性能，利用 GANs 神经网络建立了一个包含 2500 个数据集的增强数据库，然后对其进行处理，以训练和测试六个 ML 模型。结果表明，低计算成本的 ML 模型在预测 PBX 复合材料机械性能方面具有准确性和通用性。这些模型的预测值与实验值十分吻合。特征贡献分析表明，拉伸模量和破坏应变受粘合剂的影响最大，而拉伸强度受断裂能的影响最大。以上述结论为设计准则，我们可以根据不同的机械性能要求开发新的 PBX 配方，使其在不敏感弹药中得到最佳应用。这种策略可以成为设计 PBX 的一种可行的机器学习辅助解决方案。

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引用次数: 0

Electrohydrodynamic effect within CFRP laminates by bipolar nsPDC electric field during the curing process 固化过程中双极 nsPDC 电场在 CFRP 层压板内产生的电流体动力效应

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

Composites Science and Technology

Pub Date : 2024-11-02 DOI: 10.1016/j.compscitech.2024.110946

Jing Xiao , Shuran Li , Mengze Li , Yihan Fu , Xiaowen Song , Yinglin Ke

In this paper, a new method based on bipolar nanosecond pulsed superimposed direct current (nsPDC) electric field assisted curing technique was developed to fabricate modified fiber-reinforced composites to enhance their mechanical properties. It was found that the mode I interlaminar fracture toughness of the electric field-modified CFRP laminates reached 1014.2 MPa, which increased by 80.4 %. The average tensile strength and tensile modulus were 2180 MPa and 100780 MPa, respectively, which were 20.7 % and 3.5 % higher than the blank control group. The enhancement mechanism was explored by COMSOL simulation, curing temperature inspection, and microscopic characterization by electron microscopy. The results show that the presence of electric field and electric field force inside the laminate, which affects the flow of resin and the weak migration of fibers, enables the elimination of larger air bubbles present in the material, the reduction of resin-rich zones in the interlayer as well as the improvement of the fiber-resin wettability without significantly altering the curing temperature. The proposed simple, convenient, and environmentally friendly strategy can effectively regulate some of the deficiencies in the conventional manufacturing methods and thus is suitable for the optimal design of fiber-reinforced composites.

本文开发了一种基于双极纳秒脉冲叠加直流（nsPDC）电场辅助固化技术的新方法，用于制造改性纤维增强复合材料，以提高其机械性能。研究发现，电场改性 CFRP 层压板的模式 I 层间断裂韧性达到 1014.2 MPa，提高了 80.4%。平均拉伸强度和拉伸模量分别为 2180 兆帕和 100780 兆帕，比空白对照组分别提高了 20.7% 和 3.5%。通过 COMSOL 仿真、固化温度检测和电子显微镜的微观表征，对增强机制进行了探索。结果表明，层压板内部电场和电场力的存在会影响树脂的流动和纤维的微弱迁移，从而在不显著改变固化温度的情况下消除材料中存在的较大气泡，减少层间树脂富集区，并改善纤维与树脂的润湿性。所提出的简单、方便、环保的策略可以有效解决传统制造方法中的一些不足，因此适用于纤维增强复合材料的优化设计。

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引用次数: 0

Construction of multi-functional silicone rubber/reduced graphene oxide/multi-walled carbon nanotube composites with segregated structure by surfactant-free Pickering emulsion method 利用无表面活性剂皮克林乳液法构建具有离析结构的多功能硅橡胶/还原氧化石墨烯/多壁碳纳米管复合材料

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

Composites Science and Technology

Pub Date : 2024-11-01 DOI: 10.1016/j.compscitech.2024.110950

Yimiao Wang , Hang Lu , Weiping Lian , Yuhang Sun , Zhaorui Meng , Qingfeng Zhang , Jian Cui , Shuai Zhao , Yehai Yan

Polymer composites with segregated structure (PC–S) have the advantages of low filler usage and excellent functionality. Emulsion blending combined with direct molding technology is the main method for the preparation of PC-S. However, due to the high fluidity of low-viscosity silicone rubber (SR), PC-S cannot be prepared by this technique. In addition, surfactants affect the heat resistance of the final SR composites (SRC). In order to solve the above problems, in this study, a Pickering emulsification combined with pre-crosslinking technology for SR was successfully developed by using graphene oxides (GO)/multi-walled carbon nanotubes (MWCNTs) hybrid fillers (GM) as emulsifiers, and SR/reduced GO (RGO)/MWCNTs composites with segregated structure (SSGM) were prepared. When RGO content is 4.5 wt%, MWCNTs content is 3.2 wt%, SSGM shows the highest electrical conductivity of 12.5 S/m, the highest electromagnetic interference shielding efficiency (EMI SE) of 41.4 dB, and an excellent flame retardant performance. The whole preparation process avoids the use of organic solvents and surfactants, which reduces the production cost of SSGM and the environmental pollution, and provides a feasible preparation route for the industrialized production of SSGM.

具有离析结构的聚合物复合材料（PC-S）具有填料用量少、功能优异等优点。乳液混合结合直接成型技术是制备 PC-S 的主要方法。然而，由于低粘度硅橡胶（SR）的高流动性，PC-S 无法通过这种技术制备。此外，表面活性剂还会影响最终 SR 复合材料（SRC）的耐热性。为了解决上述问题，本研究采用石墨烯氧化物（GO）/多壁碳纳米管（MWCNTs）混合填料（GM）作为乳化剂，成功开发了一种皮克林乳化结合预交联的 SR 技术，并制备了具有离析结构的 SR/ 还原 GO（RGO）/MWCNTs 复合材料（SSGM）。当 RGO 含量为 4.5 wt%、MWCNTs 含量为 3.2 wt%时，SSGM 的导电率最高，为 12.5 S/m，电磁干扰屏蔽效率（EMI SE）最高，为 41.4 dB，并且具有优异的阻燃性能。整个制备过程避免了有机溶剂和表面活性剂的使用，降低了 SSGM 的生产成本，减少了对环境的污染，为 SSGM 的工业化生产提供了一条可行的制备途径。

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引用次数: 0

Fabrication and mechanical properties of CFRP honeycomb cylinder based on the transforming from the flat honeycombs 基于扁平蜂窝转化的 CFRP 蜂窝圆筒的制造和力学性能

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

Composites Science and Technology

Pub Date : 2024-10-31 DOI: 10.1016/j.compscitech.2024.110948

Zhibin Li , Pengcheng Xue , Jian Xiong

Nature has long inspired the design of high-performance structures, offering profound insights into engineering innovations through intricate biological architectures. The rational design of composite curved components is crucial for the lightweight construction of aerospace structures. In the transition from planar constructs to curved components, any mismatch in form can induce high stress, potentially leading to structural compromise or failure. Drawing inspiration from the water lily, a rational design and fabrication approach for cylindrical surface structures is proposed, transitioning from planar to curved surfaces. The adaptation of zero Poisson's ratio honeycomb to cylindrical surface is verified by experiments and simulations. The mismatch relationship between them would lead to the damage failure of the honeycomb. In view of this, the honeycomb sandwich cylinder commonly used in aerospace is fabricated by the proposed method. Theoretical predictions and experimental characterizations were conducted to analyze failure modes under axial compression. This led to the creation of a failure mechanism map for the honeycomb cylinder. Load-mass efficiency analysis revealed that face-crushing failure provides high bearing efficiency. Additionally, the effects of facesheet thickness, along with a comparison of failure modes and imperfection sensitivity between single and sandwich cylinders, were explored. The results indicate that the sandwich cylinder exhibits a higher specific load-bearing capacity and lower imperfection sensitivity compared to the single cylinder.

长期以来，大自然为高性能结构的设计提供了灵感，通过错综复杂的生物结构为工程创新提供了深刻的启示。合理设计复合曲面部件对于航空航天结构的轻质建造至关重要。在从平面结构过渡到曲面部件的过程中，任何形式上的不匹配都会引起高应力，从而可能导致结构受损或失效。从睡莲中汲取灵感，提出了一种从平面过渡到曲面的圆柱表面结构的合理设计和制造方法。实验和模拟验证了零泊松比蜂窝结构对圆柱表面的适应性。它们之间的不匹配关系会导致蜂窝的损坏失效。有鉴于此，我们采用所提出的方法制造了航空航天领域常用的蜂窝夹层圆柱体。对轴向压缩下的失效模式进行了理论预测和实验分析。由此绘制了蜂窝圆柱体的失效机理图。载荷-质量效率分析表明，面压破坏具有很高的承载效率。此外，还探讨了面片厚度的影响，并比较了单筒和夹层筒的失效模式和缺陷敏感性。结果表明，与单圆柱体相比，夹层圆柱体具有更高的特定承载能力和更低的缺陷敏感性。

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引用次数: 0

Experimental study on the influence of optimised automated fibre placement processing parameters on the impact response and residual flexural strength of AS4/APC-2 laminates 关于优化自动纤维铺放加工参数对 AS4/APC-2 层压板冲击响应和残余抗弯强度影响的实验研究

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

Composites Science and Technology

Pub Date : 2024-10-30 DOI: 10.1016/j.compscitech.2024.110945

Shafaq Shafaq , Matthew J. Donough , Binayak Bhandari , Andrew W. Phillips , Nigel A. St John , B. Gangadhara Prusty

This study explores automated fibre placement (AFP) for manufacturing impact-resistant carbon fibre/PEEK (AS4/APC-2) laminates by modifying the in-situ consolidation parameters. However, manufacturing these laminates without compromising their mechanical properties is challenging owing to the synergistic effect of parameters. The results indicate that a fast deposition rate and high consolidation force are associated with improved impact resistance and a higher threshold energy for damage. Improvements in flexural strength (27.4 %) and modulus (22.6 %), are achieved in non-impacted specimens. Acoustic emission monitoring was conducted during flexural-after-impact test to correlate the internal damage with the mechanical performance of AS4/APC-2 composites. The experimental results indicated that a fast deposition rate combined with high consolidation force can withstand higher impact loads. The FAI test showed the highest residual flexural strength and stiffness under these parameters, as it effectively resisted low-velocity impact (LVI) damage. However, the slight trade-off observed in post-impact strength suggested the presence of resin-rich areas, which may affect the damage tolerance of the laminates.

本研究通过修改原位固结参数，探索了制造抗冲击碳纤维/PEEK（AS4/APC-2）层压板的自动纤维铺放（AFP）技术。然而，由于各种参数的协同作用，要在不影响其机械性能的情况下制造这些层压板具有挑战性。结果表明，快速沉积率和高固结力与抗冲击性的改善和更高的破坏阈值能量有关。非撞击试样的抗弯强度（27.4%）和模量（22.6%）均有所提高。在挠曲-冲击后试验期间进行了声发射监测，以将内部损伤与 AS4/APC-2 复合材料的机械性能联系起来。实验结果表明，快速沉积与高固结力相结合可承受更大的冲击载荷。在这些参数下，FAI 试验显示出最高的残余抗弯强度和刚度，因为它能有效抵抗低速冲击（LVI）损伤。然而，在冲击后强度方面观察到的轻微折衷表明存在富含树脂的区域，这可能会影响层压板的损伤耐受性。

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引用次数: 0

Improving the high-voltage insulation properties of polypropylene by introducing trace addition of polyvinylidene fluoride: An experimental and simulation study 通过微量添加聚偏二氟乙烯改善聚丙烯的高压绝缘性能：实验和模拟研究

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

Composites Science and Technology

Pub Date : 2024-10-30 DOI: 10.1016/j.compscitech.2024.110939

Ohuk Lee , Do-Kyun Kim , Hana Kim , Seong Hwan Lee , Taehoon Kwon , Ik-Su Kwon , Keisuke Shinozaki , Masayuki Hikita , Jin Hong Lee , Dae Ho Lee , Min Hee Kim , Masahiro Kozako , Seunggun Yu

Various additives ranging from inorganic nanoparticles to organic additives have been suggested to improve the insulation performance of polymeric materials for high-voltage engineering applications. Herein, a simple method for doping fluorine into a polypropylene (PP) matrix was presented by melt-blending of isotactic PP (iPP) with a small amount of polyvinylidene fluoride (PVDF) as a thermoplastic voltage stabilizer (TVS). During melt-mixing, the PVDF TVS, which is immiscible with PP, is gradually split into smaller domains within the iPP matrix and finely distributed, especially at a low PVDF content. The direct current (DC) breakdown strength (BDS) values of the PVDF-doped iPP increased by 110 % and 149 % at 25 and 110 °C, respectively, compared to those of the pristine PP, while its dielectric permittivity and loss tangent values remained nearly similar to those of iPP at wide temperature between 25 and 140 °C and frequency range between 1 Hz and 10 MHz. Quantum chemical simulation results reveal that a small amount of PVDF with high dipole moment introduces deep trap sites within the polymer matrix, which contribute for increasing BDS of iPP. Also, the PP with a small amount of PVDF dopants below 1.0 phr exhibited no any decrease in the tensile strength and elongation at break values. Therefore, the PVDF-doped iPP is anticipated as a potential candidate as high-performance high-voltage insulation materials for next-generation insulation applications.

为了改善高压工程应用中聚合物材料的绝缘性能，人们提出了从无机纳米粒子到有机添加剂等各种添加剂。本文介绍了一种在聚丙烯（PP）基体中掺入氟的简单方法，即在异方性聚丙烯（iPP）中熔融混合少量聚偏二氟乙烯（PVDF）作为热塑性电压稳定剂（TVS）。在熔融混合过程中，与聚丙烯不相溶的 PVDF TVS 在 iPP 基体中逐渐分裂成更小的畴，并精细分布，尤其是在 PVDF 含量较低时。与原始聚丙烯相比，掺杂 PVDF 的 iPP 在 25 ℃ 和 110 ℃ 时的直流击穿强度（BDS）值分别增加了 110 % 和 149 %，而其介电常数和损耗正切值在 25 ℃ 至 140 ℃ 的宽温度和 1 Hz 至 10 MHz 的频率范围内几乎与 iPP 保持相似。量子化学模拟结果表明，少量具有高偶极矩的 PVDF 会在聚合物基体中引入深阱点，从而增加 iPP 的 BDS。此外，掺入少量 PVDF（低于 1.0 phr）的聚丙烯在拉伸强度和断裂伸长率值方面没有任何下降。因此，掺杂 PVDF 的 iPP 有可能成为下一代绝缘应用中高性能高压绝缘材料的候选材料。

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引用次数: 0

Fully automated measurement of the spatial distribution of both fibre length and orientation from micro-CT images of short fibre reinforced polymers 从短纤维增强聚合物的显微 CT 图像中全自动测量纤维长度和取向的空间分布

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

Composites Science and Technology

Pub Date : 2024-10-29 DOI: 10.1016/j.compscitech.2024.110943

L.M. Martulli, M. Sordi, A. Dinosio, A. Bernasconi

The morphology of Short Fibre Reinforced Polymers (SFRPs) plays a fundamental role in determining their stiffness, strength and fracture behaviour. Measurements tools for the analysis of their microstructure are therefore of paramount importance. To this end, a fully automated algorithm able to segment single fibres from X-ray micro-computed tomography images was developed. This method was tailored to reconstruct the microstructure of large volumes of material; in particular, to acquire fibre length, position and orientation, even dealing with low-resolution images. The algorithm was tested on different specimens of short glass fibre-reinforced polyamide and it was validated comparing the fibre orientation with the one obtained with commercial software analysis and the fibre length with the experimentally determined one. Therefore, the proposed algorithm allows to easily identify microstructural trends without requiring the usual complex evaluating procedures.

短纤维增强聚合物（SFRP）的形态在决定其刚度、强度和断裂行为方面起着至关重要的作用。因此，分析其微观结构的测量工具至关重要。为此，我们开发了一种能够从 X 射线微型计算机断层扫描图像中分割单根纤维的全自动算法。该方法专门用于重建大量材料的微观结构，特别是获取纤维长度、位置和方向，甚至可以处理低分辨率图像。该算法在不同的短玻璃纤维增强聚酰胺试样上进行了测试，并将纤维取向与商业软件分析获得的取向进行了比较，将纤维长度与实验确定的纤维长度进行了比较。因此，所提出的算法可以轻松识别微观结构趋势，而无需通常复杂的评估程序。

引用次数: 0

Electromagnetic wave absorption and enhanced mechanical properties of magnetic self-healing metal shell microcapsules filled polymer 填充聚合物的磁性自修复金属壳微胶囊的电磁波吸收和增强机械性能

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

Composites Science and Technology

Pub Date : 2024-10-29 DOI: 10.1016/j.compscitech.2024.110944

Qian Ren , Xiaoyu Zhang , Yiran Wu , Dawei Sun , Xin Zhang

In this work, PUF/PU@IPDI (PPI) polymer shell microcapsules were synthesized through interfacial polymerization and in situ polymerization. Subsequently, a layer of metal Ni was plated on the surface of microcapsules to fabricate Ni/PUF/PU@IPDI (NPPI) composites. The results revealed that NPPI microcapsules exhibited superior thermal stability and mechanical properties, and NPPI-60 obtained the greatest strength (102.8 MPa). The minimum reflection loss (RL) value of the NPPI-20 composite was up to −32.8 dB at 5.5 mm and the corresponding effective absorption bandwidth (EAB) was 2.4 GHz. Additionally, the NPPI-10 composite displayed the highest healing efficiency (78.6 % and 86.6 % for the scratch depth and width, respectively), and the mechanical strength and fracture toughness of epoxy resin were enhanced by the addition of metal microcapsules. The core-shell structure established by electroless plating can endow self-healing microcapsules with outstanding mechanical characteristics as well as good wave absorption capability, indicating that NPPI composites have promising applications in the field of electromagnetic wave absorption and function and structure integration design of composites.

本研究通过界面聚合和原位聚合合成了 PUF/PU@IPDI (PPI) 聚合物外壳微胶囊。随后，在微胶囊表面镀上一层金属镍，制成了镍/PUF/PU@IPDI（NPPI）复合材料。结果表明，NPPI 微胶囊具有优异的热稳定性和机械性能，其中 NPPI-60 的强度最大（102.8 兆帕）。NPPI-20 复合材料在 5.5 mm 时的最小反射损耗 (RL) 值高达 -32.8 dB，相应的有效吸收带宽 (EAB) 为 2.4 GHz。此外，NPPI-10 复合材料的愈合效率最高（划痕深度和宽度分别为 78.6 % 和 86.6 %），环氧树脂的机械强度和断裂韧性也因添加了金属微胶囊而得到增强。通过无电解电镀建立的核壳结构可使自愈合微胶囊具有出色的力学特性和良好的吸波能力，这表明 NPPI 复合材料在电磁波吸收和复合材料功能与结构一体化设计领域具有广阔的应用前景。

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