聚苯乙烯微球表面接枝丙烯腈的研究

采用分散聚合法制备出平均粒径为3.85 μm的窄分布聚苯乙烯微球， 并在此基础上引入第二单体丙烯腈进行共聚反应， 制备出平均粒径为4.02 μm的窄分布苯乙烯-丙烯腈共聚物微球. 对聚苯乙烯微球和苯乙烯-丙烯腈共聚物微球进行了形貌及粒径、红外光谱、差示扫描量热法(DSC)分析， 结果表明丙烯腈基团均匀分布在聚苯乙烯微球表面， 提高了聚苯乙烯微球表面的极性.

Study on Acrylonitrile Graft Copolymerization on Surfaces of Polystyrene Microspheres

Functional polymer microspheres with micron size, due to their excellent properties such as small size, narrow size distribution and kinds of functional groups, have gained broad applications in biomedicine, catalyst, bioengineering, separating engineering and information technology. In the present paper, uniform polystyrene (PS) microspheres with average size of 3.85 μm were prepared by dispersion polymerization. Through adding second monomer acrylonitrile (AN) to initiate dispersion copolymerization, uniform P(St-AN) copolymer microspheres with average size of 4.02 μm were prepared. These two kinds of polymer microspheres were characterized by morphology and size analysis, FT-IR and DSC. The results showed that acrylonitrile groups were uniformly grafted on the surfaces of polystyrene microspheres and enhanced the polarity of the surfaces. For the P(St-AN) copolymer micro-spheres, average diameter D=4.02 μm, standard deviation δ=0.30 μm, coefficient of variation ε=0.075 and glass transition temperature Tg=86.5 ℃.