碘转移本体聚合制备PS-b-PBA-b-PS共聚物:聚合动力学、结构和性能  

Poly(styrene-b-butyl acrylate-b-styrene) copolymers prepared by iodine transfer bulk polymerization: Kinetics, structure and properties

作　　者：章璐鑫 常兆恒 余大洋 包永忠[1,2] ZHANG Luxin;CHANG Zhaoheng;YU Dayang;BAO Yongzhong(State Key Laboratory of Chemical Engineering,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310058,China;Institute of Zhejiang University-Quzhou,Quzhou 324000,China)

机构地区：[1]浙江大学化学工程与生物工程学院,化学工程国家重点实验室(浙江大学),浙江杭州310058 [2]浙江大学衢州研究院,浙江衢州324000

出　　处：《高校化学工程学报》2024年第3期432-439,共8页Journal of Chemical Engineering of Chinese Universities

摘　　要：以碘仿为链转移剂、偶氮类化合物为引发剂,通过碘转移本体聚合合成碘封端聚丙烯酸丁酯(I-PBA-I),并以其调节苯乙烯扩链聚合,制得聚苯乙烯-b-聚丙烯酸丁酯-b-聚苯乙烯(PS-b-PBA-b-PS)共聚物,研究了聚合动力学、共聚物结构和性能。发现丙烯酸丁酯均聚和苯乙烯扩链聚合均符合活性自由基聚合特征,反应初始BA与CHI3物质的量比n_(BA,0)/n_(CHI3,0)从100/1增至1 000/1时,I-PBA-I数均分子量由15 000增大到134 500;以数均分子量为28 400的I-PBA-I为大分子链转移剂,反应初始BA与St物质的量比n_(BA,0)/n_(St,0)为1/1、1/2、1/3和1/4时扩链得到数均分子量分别为46 000、69 000、97 500、127 000的PS-b-PBA-b-PS共聚物;嵌段共聚物微相分离,在增韧的同时保持一定的透光率,PS与PBA物质的量比n_(PS)/n_(PBA)为3.85/1的嵌段共聚物抗冲强度与商品化阴离子活性聚合苯乙烯-丁二烯嵌段共聚树脂相当。Iodine-terminated poly(butyl acrylate)(I-PBA-I)was prepared by iodine transfer bulk polymerization using iodoform chain transfer agent and azo-initiator,and further applied as a macro-chain transfer agent in the chain extension polymerization of styrene to synthesize poly(styrene-b-butyl acrylate-b-styrene)(PS-b-PBA-b-PS)copolymers.The polymerization kinetics,structure and properties of PS-b-PBA-b-PS were characterized.The results show that both homopolymerization of butyl acrylate and block copolymerization of styrene exhibit the characteristics of"living radical polymerization".The number average molecular weight of I-PBA-I was increased from 15000 to 134500 as the feed molar ratio of BA to CHI3(nBA,0/nCHI3,0)increased from 100/1 to 1000/1.PS-b-PBA-b-PS copolymers with the number average molecular weight of 46000,69000,97500 and 127000 were obtained at nBA,0/nSt,0 ratios of 1/1,1/2,1/3 and 1/4,respectively.Micro-phase separation was observed in PS-b-PBA-b-PS copolymers,and block copolymers exhibited certain transparency and improved toughness.The impact strength of PS-b-PBA-b-PS copolymer with nPS/nPBA of 3.85/1 was similar to that of commercial styrene-butadiene block copolymer prepared by anion living polymerization.

关 键 词：聚苯乙烯 聚丙烯酸丁酯 碘转移聚合 聚合动力学 嵌段共聚物 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]