采用细乳液法制备γ-甲基丙烯酰氧基正丙基三甲氧基硅烷(MPS)改性苯丙乳液.研究了引发剂、pH值、MPS的用量等对乳胶膜凝胶含量、溶胀比及动态力学性能的影响.溶胀实验表明,乳胶粒子和乳胶膜凝胶含量及溶胀比主要受体系的pH值影响比较大.动态力学分析表明,在中性条件下使用过硫酸钾(KPS)引发剂得到的乳胶膜的储存模量要高于偶氮二异丁腈(AIBN)乳胶膜的储存模量;增加MPS的用量以及对乳胶膜进行酸化处理或热处理可以提高乳胶膜的储存模量.
Alkoxysilane-functionalized poly (styrene-co-butyl acrylate) latex was prepared via miniemulsion copolymerization of γ-methacryloxypropyhrimethoxysilane (MPS), styrene and butyl acrylate using azobisisobutyronitrile(AIBN) at neutral condition. The effects of initiator types, pH values, and MPS contents on the premature crosslinking of the latex particles and the mechanical properties of the films were investigated by the swelling experiments and dynamic mechanical analysis. It is found that the storage modulus of the latex films increases with increasing MPS content. The acidification of latex prior to film formation and annealing the latex films can improve the mechanical properties of the films.
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