采用原位聚合法和浇注模压工艺合成出一系列经不同方法处理的炭纤维( CF)/聚醚型聚氨酯( PU)弹性体。通过机械性能测试，热失重分析和扫描电子显微镜等手段研究不同处理方法和CF含量对CF/PU弹性体复合材料的物理机械性能、热性能和微观形态的影响。结果表明，偶联剂中以胺基硅烷KH5501、KH602和钛酸酯类TCAˉK44处理CF对CF/PU复合材料的机械性能改善效果明显；硝酸氧化的CF对复合材料的机械性能和热稳定性均明显改善；硝酸氧化处理CF与PU间的黏接性优于偶联剂处理CF/PU间的黏接性。
A series of carbon fiber ( CF) /polyether polyurethane ( PU) composites were prepared by in situ polymerization and a casting compression molding technique. The influence of CF content and its pretreatment with a coupling agent and oxidation by 65%ˉ68% ( mass fraction) nitric acid on the mechanical performance, thermal properties and morphology of the composites was inˉ vestigated by TGA, SEM and mechanical tests. Results showed that coupling agents improve the mechanical performance of the CF/PU composites, especially for silane coupling agents KH5501, KH602 and the titanate coupling agent TCAˉK44. Nitric acid oxidaˉ tion also improved the mechanical performance and thermal stability of the composites. The adhesion between PU and nitric acidˉoxˉ idized CFs was better than that between PU and fibers treated with silane coupling agents.
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