水溶性偶氮引发剂对阳离子乳液聚合的影响

Influence of Water-Soluble Azo Initiators on Cationic Emulsion Polymerization

以苯乙烯(St)与丙烯酸丁酯(BA)为非离子单体、十六烷基三甲基氯化铵(CTAC)为乳化剂、偶氮二异丁基脒盐酸盐(AIBA)和偶氮二异丁咪唑啉盐酸盐(AIBI)为引发剂,进行间歇式阳离子乳液聚合。探讨了引发剂的用量和分子结构对瞬时转化率、乳胶粒粒径、粒径分布和粒子形态等的影响。结果表明:引发剂用量越大,单体转化率越高,乳胶粒粒径越小,粒径分布越大;使用AIBI作引发剂时,单体转化率较高,乳胶粒粒径较小。

Batch cationic emulsion polymerization was carried out with styrene（St） and butyl acrylate （BA） as non-ionic monomer, cetyl trimethyl ammonium chloride（CTAC） as emulsifier, and Azobis isobutyl amidine hydrochloride（AIBA） or Azo diisopropyl imidazoline hydrochloride（AIBI） as initiator. The effects of amounts and molecule structures of initiators on instantaneous conversion, latex particle size, PDI and particle morphology were analyzed. Results showed that higher initiator amount resulted in higher instantaneous conversion rate, smaller particle size and higher PDI. Besides, higher instantaneous conversion rate and smaller particle size were obtained when AIBI was used as initiator.