聚酰亚胺/氧化铝复合薄膜耐电晕性能研究

Corona Resistance of PI/Al_2O_3 Composite Film

采用逐层流延铺膜及热亚胺化法制备了掺杂层纳米氧化铝含量不同的聚酰亚胺/氧化铝(PI/Al_2O_3)三层复合薄膜。通过透射电子显微镜、X射线衍射仪对复合薄膜进行表征,并对复合薄膜的力学性能、热稳定性及耐电晕性能进行测试。结果表明:复合薄膜具有明显的三层结构,掺杂层中纳米Al_2O_3颗粒分散均匀,纳米Al_2O_3的加入会降低PI基体的排列有序度。加入纳米Al_2O_3颗粒后PI/Al_2O_3三层复合薄膜的拉伸强度和断裂伸长率降低,热稳定性和耐电晕性能提高。当掺杂层无机含量为16%时,PI/Al_2O_3三层复合薄膜的耐电晕时间比纯PI薄膜提高了48倍。

Tri-layer polyimide （PI）/Al2O3 composite films with different doping content of Al2O3 in doped-layer were prepared by layer-by-layer tape casting method and thermal imidization. The films were characterized by transmission electron microscope and X-ray diffractometer, and then their mechanical properties, thermal stability, and corona resistance were tested. The results show that the composite films have obvious tri-layer structures and the nano-Al2O3 particles in the doped-layer well disperse. After adding nano-Al2O3 particles, the degree of order of PI matrix reduces, the tensile strength and elongation at break of the PI/Al2O3 composite films decrease, and the thermal stability and corona resistance increase. When the content of nano-Al2O3 particles in the doped-layer is 16%, the corona resistance time of the tri-layer PI/Al2O3 composite films is 48 times longer than that of pure PI film.