【摘要】 通过合成新型改性剂——(γ-苯乙炔亚胺基)丙基三乙氧基硅烷(PEIPTES)实现对SiO2前驱体的原位改性,制备新型异构聚酰亚胺/SiO2杂化浆料,利用元素分析、FT-IR、热重分析等对PEIPTES的结构和性能以及新型杂化浆料的结构进行表征与分析。结果表明,杂化浆料中有机相与无机相之间形成化学键。利用该杂化浆料对碳纤维表面进行改性。AFM分析表明,改性后碳纤维表面覆盖一层有纳米级颗粒状突起的物质,增加表面粗糙度,有利于改善复合材料界面性能。复合材料力学性能研究表明,杂化浆料可提高碳纤维/异构聚酰亚胺复合材料的层间剪切强度,当SiO2含量为5wt%时层间剪切强度达到最大值,此时冲击性能和界面耐热性能均有显著提高。更多还原

【Abstract】 A novel modifier,γ-(phenylethynyl)imidepropyltriethoxysilane(PEIPTES) was synthesized to make modified SiO2 precursor,and then the novel isomeric polyimide/SiO2 hybrid sizing was prepared.The structure and properties of PEIPTES,the structure of novel hybrid sizing were characterized by element analysis,FT-IR and thermoanalysis.The results indicated chemical bond was produced between organic phase and inorganic phase in the sizing.Analysis by AFM illustrated that a layer with nano particles was formed on carbon fiber surface after treated by the novel hybrid sizing,roughness was increased and interface properties of composites would be improved.It was confirmed that the hybrid sizing increased ILSS of the carbon fiber/isomeric polyimide composites,the optimal content of SiO2 was 5wt%.At the same time impact properties and thermal properties of the composites were both increased obviously.更多还原