Rapid fabrication of high strength PEEK/CNTs composites with segregated structure and weld repair through microwave sintering

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing Pub Date : 2025-09-30 DOI:10.1016/j.compositesa.2025.109333

Jiewei Hu, Tao Yang, Di Wu, Jie Zhang

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引用次数: 0

Abstract

Fabrication of conductive polymer composites (CPCs) with segregated structure to achieve electromagnetic interference (EMI) shielding while maintaining mechanical properties remains a challenging issue. In this work, high strength polyether-ether ketone (PEEK)/carbon nanotubes (CNTs) composites with segregated conductive networks were facilely fabricated via microwave sintering (MS). The selective heating behavior and temperature distribution during MS were investigated from both macroscopic and microscopic perspectives, revealing a unique heating mechanism. The coated CNTs layer was selectively heated under microwave irradiation, leading to welding of the PEEK matrix. This promoted molecular entanglement across interfaces, improving mechanical properties while maintaining the integrity of the segregated structure. Consequently, PEEK/5 wt% CNTs composites fabricated by MS exhibited excellent conductivity (17.3 S/m) and EMI SE (31.7 dB) in the X-band region, along with a high tensile strength of 81.2 MPa, which was 54.1 % higher than that of CM sample with comparable electrical properties. Finally, this technique was innovatively applied for weld repair of fractured samples. This study provides a novel, economical and energy saving strategy not only for the rapid fabrication of high strength PEEK/CNTs composites with segregated structure, but also for the field of rapid weld repair of polymer materials.

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微波烧结快速制备具有分离结构的高强度PEEK/CNTs复合材料及焊缝修复

制造具有分离结构的导电聚合物复合材料（cpc），在保持机械性能的同时实现电磁干扰（EMI）屏蔽，仍然是一个具有挑战性的问题。本文采用微波烧结的方法制备了具有分离导电网络的高强度聚醚醚酮(PEEK)/碳纳米管（CNTs）复合材料。从宏观和微观两个角度研究了质谱过程中的选择性加热行为和温度分布，揭示了一种独特的加热机制。在微波照射下选择性加热涂覆的CNTs层，导致PEEK基体的焊接。这促进了界面上的分子纠缠，提高了机械性能，同时保持了分离结构的完整性。因此，MS制备的PEEK/5 wt% CNTs复合材料在x波段具有优异的电导率（17.3 S/m）和EMI SE (31.7 dB)，同时具有81.2 MPa的高抗拉强度，比具有类似电性能的CM样品高54.1%。最后，创新性地将该技术应用于断裂试样的焊缝修复。该研究不仅为快速制备具有分离结构的高强度PEEK/CNTs复合材料，而且为聚合物材料的快速焊接修复领域提供了一种新颖、经济、节能的方法。

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来源期刊

Composites Part A: Applied Science and Manufacturing 工程技术-材料科学：复合

CiteScore

15.20

自引率

5.70%

发文量

492

审稿时长

30 days

期刊介绍： Composites Part A: Applied Science and Manufacturing is a comprehensive journal that publishes original research papers, review articles, case studies, short communications, and letters covering various aspects of composite materials science and technology. This includes fibrous and particulate reinforcements in polymeric, metallic, and ceramic matrices, as well as 'natural' composites like wood and biological materials. The journal addresses topics such as properties, design, and manufacture of reinforcing fibers and particles, novel architectures and concepts, multifunctional composites, advancements in fabrication and processing, manufacturing science, process modeling, experimental mechanics, microstructural characterization, interfaces, prediction and measurement of mechanical, physical, and chemical behavior, and performance in service. Additionally, articles on economic and commercial aspects, design, and case studies are welcomed. All submissions undergo rigorous peer review to ensure they contribute significantly and innovatively, maintaining high standards for content and presentation. The editorial team aims to expedite the review process for prompt publication.