碳化钛/聚酰亚胺高介电复合薄膜的制备及性能研究

Preparation and Properties of TiC/PI Composite Films with High Dielectric Constant

采用机械共混法将经硅烷偶联剂改性的碳化钛粉体掺杂入聚酰亚胺中,制备了碳化钛/聚酰亚胺复合薄膜。分析了不同碳化钛粒子含量对复合薄膜的显微结构、力学性能及介电性能的影响。实验结果表明,随着纳米TiC含量的不断升高,复合薄膜的拉伸强度呈现先上升后下降的趋势,复合薄膜的耐电击穿场强迅速下降。与此同时,复合材料的介电常数则显著提高。

A series of TiC/PI composite films were prepared by mechanical dispersion method. Modifier silicon coupling agent （DB550） was added during composite preparation to disperse the TiC partieles in polyimide matrix. The effects of TiC contents on the micro-morphology, mechanical and electrical properties of PI composite films were investigated. The results indicated that the addition of TiC particles had a great effect on the properties of P1 composite films. With the increase in volume content of TiC, the tensile strength of the composite films increased firstly to as high as 137MPa, when TiC content was 10%, then it decreased with the further increasing of TiC content. However, the resistanee field electric breakdown of composite film was falling with the increase of TiC contents. The analysis results of dielectric performance showed that the dielectric properties of the composite films were much better than that of the pure film.