聚酰亚胺/纳米Al_2O_3三层复合薄膜的制备

Preparation of three-layer polyimide/nano-alumina composite films

将掺杂纳米Al2O3的聚酰胺酸与未掺杂聚酰胺酸在玻璃板上逐层涂膜,热亚胺化制备了3层聚酰亚胺/纳米Al2O3复合薄膜。采用扫描电镜(SEM)对该薄膜的微观形貌进行了表征,测试了薄膜的热稳定性、力学性能及电击穿场强。结果表明,复合薄膜的热性能及电击穿场强均高于掺杂薄膜及未掺杂膜,当热失重达到10%时,复合薄膜的热分解温度达到了629.1℃;与掺杂薄膜相比,复合薄膜的力学性能得到明显提高,拉伸强度和断裂伸长率分别为117.4 MPa和18.5%。

Three-layer polyimide/nano-aluminacomposite film was prepared with thermal imiditation after pure poly（amie acid） or Al2O3/poly（amic acid） solution was east on glass plate step by step. The micro-morphology of PI films were characterized by scanning electron micrographs （SEM）. The thermal stability, mechanical properties and electric breakdown strength of PI films were investigated. The results indicated that the thermal stability and electric breakdown strength of PI composite film were better than pure film and hybrid film. The decomposition temperature of PI composite film was 629.1℃ at 10% weight loss. The mechanical properties of PI composite film were improved obviously in comparison of the hybrid film, the tensile strength of PI composite film was 117.4MPa, and the elongation at break was 18.5%.