通过两步法制备了改性碳纤维/聚氨酯复合材料。探究了电化学氧化处理法与表面涂层法相结合的一种新型改性方法对碳纤维增强聚氨酯基复合材料性能的影响。通过对碳纤维进行电化学氧化在表面引入含氧官能团,改善碳纤维表面活性。随后向电化学氧化改性的碳纤维施加硅烷偶联剂溶液,在修复碳纤维表面损伤的同时通过化学反应将碳纤维与聚氨酯桥接在一起,提高碳纤维与聚氨酯界面结合性能。结果表明:经电化学氧化/硅烷偶联剂处理后的复合材料对比原始碳纤维聚氨酯复合材料及仅电化学氧化碳纤维聚氨酯复合材料抗拉性能分别提高了83.5%与73.5%,力学性能提升显著。
The modified carbon fiber/polyurethane composites were prepared by two-step method.The influence of a new modification method combining electrochemical oxidation treatment and surface coating on the properties of carbon fiber-reinforced polyurethane composites was explored.By electrochemical oxidation of carbon fibers,oxygen-containing functional groups were introduced on the surface to improve the surface activity of carbon fibers.Then,a silane coupling agent solution was applied to the electrochemically oxidized carbon fibers.While repairing the surface damage of carbon fibers,carbon fibers and polyurethane were bridged together by chemical reaction to improve the interface bonding property between carbon fibers and polyurethane.The results showed that the tensile properties of the composites treated with electrochemical oxidation/silane coupling agent were increased by 83.5% and 73.5%,respectively,compared with those of the original carbon-fiber-reinforced polyurethane composite material and the composites material treated only with electrochemical oxidation.The mechanical properties were improved significantly.
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基金资助
国家自然科学基金面上项目(52076047)
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