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首先在自制的聚酰胺酸(PAA)溶液中加入聚酰亚胺(PI)粉末,使用常规升温工艺制备了PI/PAA型复合PI;继而又制备了氧化锌(ZnO)包覆的二氧化钛(TiO_2)颗粒,然后将其添加至复合PI中,得到改性复合PI。采用激光粒度仪(LPS)、X射线衍射仪(XRD)、紫外可见光分光光度计(UV-Vis)和热重分析仪(TG)对改性前后的复合PI进行了表征。结果表明:ZnO很好地包覆于TiO_2颗粒表面,包覆颗粒的粒径集中于150 nm。当PI粉末的添加量为0.4%时,所得复合PI薄膜的透光率最佳,可达62%;采用包覆颗粒对复合PI进行改性后,材料依然具有优异的耐热性能,同时其透光率高达70%。
Firstly, polyimide (PI) powder was added to PAA solution and PI / PAA composite PI was prepared by conventional heating process. Then ZnO (TiO 2) coated TiO 2 ) Particles, which are then added to the composite PI to give a modified composite PI. The composite PI before and after modification was characterized by LPS, XRD, UV-Vis and TG. The results showed that ZnO coated on the surface of TiO 2 particles with particle size of 150 nm. When PI powder is added in an amount of 0.4%, the transmittance of the obtained composite PI film is the best, up to 62%; the modified PI with coated particles has excellent heat resistance, Light transmission up to 70%.