졸-겔 공정에 의한 PVP/Silica 하이브리드 필름의 제조 및 특성

Preparation and Characteristics of PVP/Silica Hybrid Film by Sol-Gel Process

The transparent organic-inorganic hybrid films were prepared by the Sol-Gel process. PVP(polyvinylpyrrolidone) was used in organic component and TEOS(tetraethoxysilane) was used in inorganic component. HCI, CH₃COOH, and NH₄OH were used as the Sol-Gel catalyst. The characteristics according to not only the variation of organic and inorganic contents but also the variation of catalyst species and contents were investigated. On the whole, the compatibility was remained between organic and inorganic components, and also as the TEOS contents were increased, mostly the transparency and the mechanical, thermal properties were improved. In addition, as content of catalysts was increased, the films showed characteristics that were closer to PVP than silica. Although the transparency of films was preserved in HCI and CH₃COOH, only the film containing more than 40wt% TEOS in NH₄OH showed different phenomena.