SiO2/TiO2/聚酰亚胺复合杂化环氧树脂基碳纤维浆料的制备与表征

 采用溶胶－凝胶技术，在合成的聚酰胺酸（PAA）中对纳米SiO2/TiO2前驱体进行原位改性，添加硅烷偶联剂（WD-50）和适当的表面活性剂，利用超声空化及复配技术制备了碳纤维用环氧树脂基-SiO2•TiO2复合杂化聚酰亚胺增强浆料。采用FTIR、DSC、粒径分析仪、力学测试、STM等手段对制备的PAA-SiO2-TiO2复合改性增强浆料的性能及其在碳纤维上浆膜铺展的显微形貌进行了分析。结果表明，SiO2•TiO2以纳米粒度分布于浆膜中，上浆后碳纤维轴向表面有一层纳米级粒状突起，表面较为粗糙，碳纤维的界面性能得到了改善。力学实验表明，杂化浆料处理后碳纤维的抗拉强度及层间剪切强度显著提高。

Preparation and property of epoxy based nano-SiO2/TiO2/ polyimide hybrid enhanced size for carbon fibers

An epoxy based nano-SiO2/TiO2/polyimide hybrid enhanced sizing for carbon fiber was prepared by in-situ modification of SiO2/TiO2 precursor in PAA collosol with silane couple agent(WD-50) and proper surfactant through sol-gel technique,and during the preparation the ultrasonic cavitation and compounding technologies were utilized.The properties of PAA-SiO2-TiO2 hybrid sizing and micro-morphology of its film formed on carbon fiber surface were analyzed by FTIR,DSC,particle size sizing film homogeneously,and a layer of nano particles was formed on carbon fiber surface after sizing by the hybrid enhanced size,the surface of the carbon fiber looked more rough and its interfacial property was improved.Mechanical test demonstrated that both tensile strength and interlaminar shear strength of the carbon fiber sized with this product were significantly enhanced.