PMMA微球表面引发的苯乙烯原子转移自由基接枝

以双甲基丙烯酸乙二醇酯为交联剂，甲基丙烯酸-2-（α-溴异丁酰氧基）乙酯为功能单体，制备了粒径为18.7nm的聚甲基丙烯酸甲酯（PMMA）微球。在溴化亚铜（CuBr）/2，2′-联吡啶的催化下，以该PMMA微球作为苯乙烯原子转移自由基聚合的引发剂，成功进行了苯乙烯的接枝聚合，且聚合过程可控。

Grafting of styrene on poly(methyl methacrylate) microspheres by surface-initiated atom transfer radical polymerization (ATRP)

Controlled grafting polymerization of styrene by atom transfer radical polymerization (ATRP) from cross linked poly(methyl methacrylate) (PMMA) microspheres has been carried out. PMMA microspheres with a diameter of 187?nm were prepared by emulsion polymerization of MMA in the presence of ethylene glycol dimethacrylate and a functional monomer，-2-(α-bromoisobutyryl) ethyl methacrylate. The functional monomer was prepared by a two step organic synthesis. Firstly, α-bromoisobutyl acyl bromide was synthesized by reacting bromine with isobutyr ic acid. Secondly, 2-(α-bromoisobutyryl) ethyl methacrylate (BIBEMA) was synthesized by reaction of the α-bromoisobutyl acyl bromide with 2-hydrox ylethyl methacrylate. The diameter and diameter distribution of the latex sphere s were characterized by dynamic light scattering (DLS). Grafting polymerization of styrene by ATRP was successfully carried out in the presence of a CuBr/2,2′ bipyridyl complex and PMMA microgel as macroinitiator. The results of GPC and DLS confirmed the living nature of the grafting polymerization.