1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China;
2. Key Laboratory of Shanghai City for Lightweight Composites, Donghua University, Shanghai 201620, China;
3. Composite Manufacturing Center of Commercial Aircraft, Shanghai Aircraft Manufacturing Co., Ltd., Shanghai 200436, China
Abstract：Carbon fiber fabric reinforced polyphenylene sulfide (CFF/PPS) composite is one of most important thermoplastic composites for aviation. The main difficulties of preparing tough and strong CFF/PPS are to improve the infiltration and interfacial strength between carbon fibers (CF) and PPS matrix. The effects of surface modifications for CF on the interfacial strength between CF and PPS were investigated. Particularly, the influences of various processing conditions of annealing and coating with three modifiers on mechanical properties of CF and CFF/PPS were discussed. The effectiveness of surface modifications for CF was evaluated with several methods of characterization, including X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), single fiber strength test, interlaminar shear strength (ILSS) test, and dynamic mechanical analysis (DMA). Based on CF surface modification, the method to prepare high performance CFF/PPS thermoplastic composites for aviation was established. Optimized composite exhibits an ILSS of 91.4 MPa, a flexural strength of 953.7MPa, a tensile strength of 797.4MPa, a tensile modulus of 68.4 GPa, and an impact strength of 58.3kJ/m2. SEM observations on the fractural surface show that each CF is covered with substantial PPS matrix, indicating favorable adhesion between CF and PPS.
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