通过可控微乳液聚合制备聚苯乙烯超微粒子

THE PREPARATION OF MICROPOLYSTYRENE PARTICLES BY CONTROLLED MICROEMULSION POLYMERIZATION

初步研究了苯乙烯的反向原子转移自由基微乳液聚合,探讨了盐的同离子效应对提高反应可控性的作用和通过可控微乳液聚合制备聚合物超微粒子的可行性。研究结果表明,控制AIBN/CuCl2/bpy的摩尔比和在聚合体系中加入少量小分子电解质NaCl,均可提高反应的可控性;通过微乳液条件下苯乙烯的反向原子转移自由基聚合可以获得聚苯乙烯超微粒子。

The reverse atom transfer radical polymerization of styrene in the microemulsion was carried out using AIBN as initiator and CuCl_2/bpy as catalyst. The molecular weight of the polymers and monomer convention were investigated respectively. Then the effect of the same ion on the reaction was researched and the polystyrene latex particles were observed by TEM. The results indicate that there is a good linear relationship between the molecular weight and conversion when the mole ratio of AIBN/CuCl_2/bpy is 1∶3∶6. Adding NaCl to the system in which the mole ratio of AIBN/ CuCl_2/bpy is 1∶1∶2 can make the reaction be controlled better. What′s more, the latex particles is spherical in shape and is from 30nm to 80nm in diameter.