シリコーン系有機•無機複合膜の作製と電気トリーイング劣化特性

摘要

種々の構造の末端ポリアルコキシラン変性PDMSを原料とする複合膜を作製し、複合膜の構造変化に伴う電気トリー現象の変化を評価した。バブルトリー形成によるコンディショニングにより、破壊電圧を上昇させることが確認できた。特に、原料PDMSの分子量を小さくすることでトリー破壊電圧を大幅に向上させることが出来た。%Organic-inorganic hybrid materials made from polydimethylsiloxane (PDMS) and metal alkoxide have features in high dielectric strength, high heat resistivity and flexibility. We have studied the electrical insulating properties of PDMS-based hybrid materials in order to apply it to heat-resistive electrical insulating materials. In previous study, we found that the variation of crosslinking density and homogeneity of dispersion of silica clusters in PDMS-based hybrid materials influenced on their electrical tree propagation characteristics. In this work, we fabricated different structure hybrid materials made from alkoxysilane-terminated PDMS by changing molecular weight of PDMS and alkoxysilane,and investigated the electrical treeing characteristics of them. The development of AC tree of sample was mounted on a glass substrate with needle electrode was recorded by CCD camera and computer. The changes in the tree inception voltage and tree growth speed were observed in hybrid materials made from PDMSs with different structures.