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標題Title: Synthesis of PVAc/SiO2 latices stabilized by silica nanoparticles
作者Authors: 徐楓茜,林鴻儒..等
上傳單位Department: 化學工程與材料工程系
上傳時間Date: 2009-12-1
上傳者Author: 徐楓茜
審核單位Department: 化學工程與材料工程系
審核老師Teacher: 林鴻儒
檔案類型Categories: 課堂報告In-class Report
關鍵詞Keyword: PVAc, SiO2, silica
摘要Abstract: This paper presents a method for the preparation of raspberry-like organic–inorganic composite spheres with poly(vinyl acetate) (PVAc) as
core and nanosilica particles as shell. A small amount of anionic reactive surfactant, 3-allyloxy-2-hydroxy-1-propanesulfonic acid sodium salt
(HAPS), was used as co-stabilizer and nanosilica particles were adsorbed onto the growing latex core in aqueous medium via the formation of
hydrogen bonds between nanosilica particles and PVAc particles. TEM indicated that the hydrogen bonds between nanosilica particles and PVAc
were strong enough for the formation of long-stable composite spheres with raspberry-like morphology. Influences of some synthetic parameters,
for instance, type of silica sol, initial silica amount, and different kinds of low-molecular-weight surfactant, on the morphology of the composite spheres and properties of the latex films were studied in detail. A possible formation mechanism of the composite spheres was also proposed.

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