不可逆加成-断裂链转移剂正丁基-2-苯基烯丙基硫在苯乙烯乳液聚合中的研究  

The effect of butyl(2-phenylallyl)sulfane on the emulsion polymerization of styrene based on an irreversible addition-fragment chain transfer mechanism

作　　者：安粒[1] 惠嘉[1] 孙鹏森[1] 付志峰[1] 石艳[1] 

机构地区：[1]北京化工大学材料科学与工程学院化工资源有效利用国家重点实验室,北京100029

出　　处：《北京化工大学学报（自然科学版）》2012年第5期74-78,共5页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国家自然科学基金面上项目(51073010)

摘　　要：基于不可逆加成-断裂链转移机理,研究了正丁基-2-苯基烯丙基硫(BPAS)作为分子量调节剂对苯乙烯乳液聚合速率、乳胶粒子大小和聚合物数均分子量的影响。结果表明,BPAS存在下的苯乙烯乳液聚合速率有所下降,乳胶粒子粒径减小,这是由于乳胶粒子中自由基的解吸附;平均一个乳胶粒子中的自由基个数依赖于BPAS浓度;BPAS在苯乙烯乳液聚合整个过程中能有效调节聚合物分子量,其调节效率与温度无关,同时能与经典的数均分子量数学模型相匹配。The effects of adding butyl（2-phenylallyl）sulfane （BPAS） on the course of the emulsion polymerization of styrene, including the particle size and the number-average molecular weight of the product, have been investigated. The decreased polymerization rate in the presence of BPAS can be attributed to the desorption of chain-transferred radicals from the polymer particles. The experimental values of the average number of radicals per particle strongly depended on the concentration of BPAS. The number-average molecular weight can be controlled by adding BPAS over almost the whole conversion range, and its efficiency for molecular weight control is relatively independ- ent of reaction temperature which is in agreement with a mathematical model.

关 键 词：不可逆加成-断裂链转移 苯乙烯 正丁基-2-苯基烯丙基硫 乳液聚合 

分 类 号：O631[理学—高分子化学]