耐电晕PI/无机纳米氧化物复合薄膜设计及性能

采用热液法制备了纳米无机氧化物分散液,其中水解所需的水由醇缩水成醚反应提供.所得的MTES改性的纳米氧化铝与聚酰亚胺复合制成杂化聚酰亚胺复合薄膜(PI/Al2O3 - SiO2),另外还制备了未改性的纳米氧化铝杂化聚酰亚胺复合薄膜(PI/Al2O3),在试样厚度均为25 μm的情况下,采用双极性脉冲方波电压、峰-峰值2500V、频率20 kHz、占空比50％、测试温度155℃的条件下,分别测试上述两种薄膜以及Kapton 100 CR薄膜的耐电晕时间,结果表明,PI/Al2O3 - SiO2薄膜的耐电晕寿命最长,是Kapton 100 CR薄膜的6倍以上,是PI/Al2O3薄膜的12倍以上.由SEM的测试结果分析表明,PI/Al2O3 - SiO2薄膜中的无机纳米复合结构可以更有效地保护PI基体,从而提高材料的耐电晕性.

Preparation and corona resistant properties of nano-inorganic oxide hybrid PI films

The nano-dispersion of inorganic oxide is prepared by using the hydrothermal method and the water needed for the experiment is obtained from the process of the condensation reaction from alcohol into ether.The dispersion is composite with PI to make the inorganic nano-oxides hybrid PI films(PI/Al2O3-SiO2 and PI/Al2O3).As the sample is 25 μm in thickness,the test parameters are chosen as below: the waveform is bipolar square,wave pulse voltage is 2 500 V peak to peak,frequency is 20 kHz,and duty cycle is 50%,the test temperature is 155 ℃,the corona-resistant life of DuPont Kapton 100 CR film,PI/Al2O3-SiO2 film and PI/Al2O3 films are measured respectively.The results show that the corona-resistance life of the modified nano-alumina hybrid PI films is the longest of all,which is more than 6 times as that of Kapton 100 CR films and 12 times more than that of the unmodified nano-alumina hybrid PI films.From the resulting SEM images,a conclusion can be made that the inorganic nano-composite structure of the modified nano-alumina hybrid PI films protects the PI substrate more effectively.