Influence of thermoplastic fibre-epoxy adhesion on the interlaminar fracture toughness of interleaved polymer composites

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing Pub Date : 2024-11-26 DOI:10.1016/j.compositesa.2024.108619

Zaide Saka Dinç , Yahya Öz , Prasad Potluri , William W. Sampson , Hüseyin Aksel Eren

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Abstract

We present an experimental study using surface modification of polyetherimide (PEI) and polyphenylene sulfide (PPS) nonwoven fibrous veils to probe their performance as interleaves to improve the interlaminar fracture toughness (IFT) of carbon fibre-epoxy composites. Veil fibre surfaces were modified with ozone and a post-treatment with ultraviolet (UV) light (ozone + UV). From surface characterisation, mechanical testing of composites and fractography we show that for the PEI veil, these surface modifications resulted in a decreased mode I IFT attributable to decreased fibre-epoxy adhesion and hence, fibre/matrix debonding. In contrast, an increase in sulfinyl functional groups on the surface of PPS fibres after ozonation was observed alongside an increase in PPS veil-epoxy adhesion. The strong bond between fibre–matrix resisted crack propagation across veils, compelling the crack to divert through weaker carbon fibre-epoxy interfaces in adjacent layers. The mode I fracture toughness during crack propagation G_Iprop decreased, confirming the level of veil-epoxy adhesion to be a significant contributor to the IFT that can be associated with specific functional groups on fibre surfaces.

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热塑性纤维-环氧树脂黏附对交织聚合物复合材料层间断裂韧性的影响

采用聚醚酰亚胺（PEI）和聚苯硫醚（PPS）非织造纤维纱的表面改性方法，研究了它们作为交织物提高碳纤维-环氧复合材料层间断裂韧性（IFT）的性能。面纱纤维表面用臭氧改性，后处理用紫外线（UV）光（臭氧+ UV）。从表面表征、复合材料的力学测试和断口形貌来看，我们发现对于PEI膜，这些表面改性导致I型IFT降低，这是由于纤维与环氧树脂的粘附性降低，从而导致纤维/基体脱粘。相比之下，在臭氧化后，PPS纤维表面的亚砜基官能团增加，同时PPS涂层-环氧树脂附着力增加。纤维基体之间的强结合抑制了裂纹的扩展，迫使裂纹通过相邻层中较弱的碳纤维-环氧界面转移。裂纹扩展过程中的I型断裂韧性GIprop下降，这证实了纤维表面特定官能团的粘合水平是IFT的重要影响因素。

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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.