利用原子力显微镜研究聚酰亚胺／纳米SiO2复合材料

通过均苯四甲酸二酐与4，4’-二氨基二苯基醚缩聚反应制备了聚酰胺酸（PAA）。采用溶胶-凝胶法和超声波机械共混法制备了不同纳米SiO2含量的PAA／纳米SiO2共混胶液，经高温亚胺化得到聚酰亚胺（PI）／纳米SiO2复合材料。利用原子力显微镜（AFM）对PI／纳米SiO2复合材料与杜邦公司的KAPTON耐电晕复合材料及其电晕试验后的复合材料进行了表面形貌、结构和性能比较。结果表明，溶胶-凝胶法和超声波机械共混法制备的PI薄膜中的无机相是无定形的，而KAPTON薄膜中的无机相是缨束状的，具有取向的微观结构。超声波机械共混法具有很好的分散作用，而其有机相与无机相之间结合力较溶胶-凝胶法弱。

Study on Polyimide/Nano-SiO2 Composite Through

Poly(amic acid)(PAA) was prepared through the condensation polymerization between py-romelitic dianhydride and 4,4'-oxydianiline. PPA was mixed with sol-gel nano-SiO2 via ultrasonic stirring to form a slurry, which was subsequently imidized at a high temperature generating a composite of polyimide(PI)/nano-SiQ2. The surface, morphology, structure, and performance of the composites before and after the experiment of corona-resistance was examined with atom force microscope (AFM) and was compared with KAPTON films. It demonstrated superior performances of the composite over those of KAPTON.