摘要
　　本研究旨在利用溶膠-凝膠法製備Epoxy/SiO2有機-無機奈米複合材料及其在高透光性光電元件封裝之應用，在製備奈米複合材料時必須將環氧樹脂以偶合劑做適當的改質，使得有機相和無機相間具備有共價鍵，如此對於奈米複合材料機械、熱性質的提升將更有幫助。研究中改變不同的參數：PH值與觸媒種類、溫度、溶劑、固含量、中和與二氧化矽來源，並討論各個參數對複合材料的影響。利用熱重分析儀(TGA)分析材料的熱性質，紫外線-可見光光譜儀(UV-VIS)分析材料在可見光範圍內的透光性並在JEDEC吸濕規範Level 1 下測定抗濕性。

　　研究結果顯示，使用的觸媒會與環氧樹脂產生開環的反應並使材料之性質劣化。中和的步驟所產生的二氧化矽析出行為與提高反應溫度會造成二氧化矽的聚集都會使透光性下降並降低材料的抗濕性。改變固含量，二氧化矽含量越低透光性越好但是二氧化矽含量越高則會有較好的熱性質與抗濕性。以丙酮取代Tetrahydrofuran (THF)當作溶劑則會使反應不完全產生凝膠化的現象造成材料的均勻性降低使材料之透光性與熱性質均有下降的趨勢。最後以具有環氧基團的3-Glycidoxypropyl- trimethoxysilane (GPTMS)取代部分Tetraethoxysilane (TEOS)可以得到最佳之熱性質、熱機械性質、抗濕性與透光性.

Abstract
　The sol-gel technology was used to prepare organic/inorganic nanocomposites. In order to improve the compability between the organic and inorganic phases, coupling agent was used to modify the DGEBA type epoxy. Applying the sol-gel technique, the silica could be successfully incorparated into the network of hybrids. It will lead to the increasing of the thermal stability and mechanical property; The effects of pH values, kinds of catalyst, temperature, silica content, the source of silica and neutralization in the process were investigated. TGA were used to test thermal property. UV-VIS were used to test penetrability in the range of visible light wavelength. Resist humidity of nanocomposites were tested in JEDEC Level 1 moisture soak.

　The results show that, ring-opening reaction of catalyst and epoxy result in degradation of nanocomposites properties. By operating at neutralization and high temperature , aggregation and condensation of silica makes inferior penetrability. By changing silica content, low silica content had a better penetrability than high silica content, but high silica content can achieve a better thermal property and resist humidity. While Tetrahydrofuran (THF) was being substituted for Aceton, hybrid material was badly mixed because of incomplete reation and gelation. Finally, using 3-Glycidoxypropyl- trimethoxysilane(GPTMS) with epoxide group to replace a part of Tetraethoxysilane (TEOS), hybrid materials can achieve a better mechanical property,improve thermal stability,resist humidity and better penetrability can be improved.

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