本實驗的目的是製備二氧化矽/有機高分子之核殼型態複合乳膠顆粒。本實驗先在鹼性環境下，以TEOS (tetraethyoxylsilane)進行溶膠凝膠法，反應製得二氧化矽粒子 (Core)。即傳統的Stöber method。再接以尾端有乙烯基 (vinyl group，C=C)之矽烷偶合劑：VTES (vinyltriethoxysilane)，進行表面改質。最後外層以乳化聚合方式，聚合單體MMA (methyl methacrylate)，合成外殼 (shell)，形成核殼型態之複合乳膠顆粒。最後，分析合成出之乳膠顆粒其粒徑大小、型態、熱性質、FTIR等。以溶膠法製得70～120 nm大小之二氧化矽粒子，為主要反應粒子。以偶合劑先行醇縮合再滴入，可達較好的粒子表面改質效果，其粒徑約90～140 nm。並以乳化聚合方式製備核殼型態複合乳膠顆粒，其粒徑約100～160 nm。增加界面活性劑時，能增加複合顆粒之粒徑大小。

The purpose of this work is the preparation of silica / polymer composite latex in core-shell structure. Firstly, the silica particles were obtained by the sol-gel reaction of tetraethyoxylsilane (TEOS) in alkaline environment via the traditional Stöber method. In order to facilitate monomer polymerized on the surface of silica particles, the formed silica particles were modified by treating with vinyltriethoxysilane (VTES) so that the reactive vinyl group can be attached onto the silica surface. Finally, the polymerization of methyl methacrylate (MMA) on the surface of treated silica particles was carried out to form a core-shell structure by technique of emulsion polymerization. The prepared silica/PMMA core-shell composite particles were characterized by dynamic light scattering (DLS), TEM, FTIR and TGA.
It is found that the diameters of the unmodified silica particles, surface-modified silica particles and silica/PMMA particles were in the range of 70~120 nm, 90~140 nm and 100~160 nm, respectively. The modification of silica surface can be successfully achieved by addition of VTES/ethanol solutions which were prepared by dissolution of VTES in ethanol initially. Furthermore, the particle size of silica/PMMA composite increased with increasing surfactant concentration in the emulsion polymerization process.

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