![]() The interface of CFRP is the intermediate phase connecting the reinforced CFs and the polymer matrix, a unique and essential component of the composites, and transferring the applied load from the polymer matrix to the reinforced CFs. Therefore, CFRPs have been used extensively in aerospace, navigation, construction, light industry, as well as other areas ( Pilato and Michno, 1994 Zheng, 2009 Dang et al., 2012 Park and Seo, 2012 Wichita State University NIAR, 2012 Jin et al., 2013 Jin and Park, 2015 Park et al., 2015 Kim et al., 2016 Nabil, 2016 Wang et al., 2016 Lin, 2022). CFRPs have high specific strength and modulus, low density, low coefficient of thermal expansion, corrosion and abrasion resistance, fatigue resistance, good electrical conductivity, good electromagnetic shielding performance, accessibility to large-area integral molding and other excellent properties. ![]() Commonly used thermoplastic resins are polyethylene, nylon, polytetrafluoroethylene and polyetheretherketone. Commonly used thermosetting resins include epoxy, bismaleimide, polyimide and phenolic resins. The polymer matrix is usually classified into two types, thermosetting resins and thermoplastic resins. According to the source of the precursor, CFs can be divided into polyacrylonitrile (PAN)-based CFs, pitch-based CFs, and viscose-based CFs ( Zhang et al., 2021a). CFRPs are not only lightweight, but also have higher strength and higher hardness per unit weight than glass fiber polymer composites. Unlike polymer composites that use traditional fibers, such as glass fibers or aramid fibers, CFRPs offer excellent performance in terms of light weight and high strength. The prospect and trend of interface microscopic characterization technology of CFRPs have also been prospected.Ĭarbon fiber reinforced polymer composites (CFRPs) are composite materials with carbon fiber (CF) as reinforcement and polymer as the matrix, accounting for more than 90% of the total CF composites market share. For example, scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy (Raman), nanoindentation and other advanced analytical characterization techniques, as well as the application of newly developed microscopic in situ mechanical testing methods in the interface characterization of CFRPs. In this paper, various microscopic characterization methods of CFRPs interface micromorphology, microstructure, chemical composition and mechanical properties developed in recent years are reviewed. Accordingly, the deep, systematic and nuanced characterization of the microstructure and properties of the interfaces is one of the critical problems in the research field of CFRPs. The microstructure, chemical composition, bonding mode, and interfacial bonding strength of the CFRPs interface greatly influence the mechanical properties and failure behavior of CFRPs. CFRP comprises carbon fiber, polymer matrix, and the interface between them. 2State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, ChinaĬarbon fiber reinforced polymer composites (CFRPs) have excellent properties, e.g., low density, high-temperature resistance, high specific modulus, and high specific strength, and are widely used in aerospace and civil industries.1Analytical and Testing Center, Northwestern Polytechnical University, Xi’an, China.Liting Liu 1 †, Minshu Du 2 † and Feng Liu 1,2*
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