Surface Modification of Para-Aramid Fiber by Direct Fluorination and its Effect on the Interface of Aramid/Epoxy Composites |
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| Authors: | Tao Peng Renqin Cai Chaofeng Chen Fengde Wang Xiangyang Liu Bin Wang |
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| Institution: | 1. Polymer Science &2. Technology Institute , Sichuan University , Chengdu , P. R. China;3. China Bluestar Chengrand Chemical Co. Ltd , Chengdu , P. R. China;4. Technology Institute , Sichuan University , Chengdu , P. R. China;5. China Bluestar Chengrand Chemical Co. Ltd , Chengdu , P. R. China;6. Xi’an Aerospace Composites Research Institute , Xi’an , P. R. China |
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| Abstract: | Surface modification of a para-aramid fiber (DAFIII) was performed by direct fluorination. The properties of treated and untreated fibers were characterized and compared in detail by mechanical testing, Fourier transform infrared (FTIR) spectroscopy characterization, X-ray photoelectron spectroscopy (XPS) analysis and static contact angle measurements. The results showed that little damage of the fiber occurred after direct fluorine treatment, and the content of polar groups on the fibers surfaces were increased significantly, which resulted in a lower value of contact angle. The interlaminar shear strength (ILSS) of DAFIII fiber/epoxy composites and the tensile strength of NOL-ring specimens increased by 33% and 12%, increasing to 56.2 MPa and 2340 MPa, respectively, which indicated that the interfacial adhesion between the matrix and the aramid fiber was improved significantly by the fluorination treatment. Further tests showed that the durability of the direct fluorination treatment on the aramid fiber was also satisfactory. |
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| Keywords: | aramid fiber aramid/epoxy composites direct fluorination surface modification surface properties |
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