CIESC Journal ›› 2018, Vol. 69 ›› Issue (2): 840-847.DOI: 10.11949/j.issn.0438-1157.20171005

Previous Articles     Next Articles

Preparation of poly(styrene-b-butyl acrylate-b-styrene) copolymers by single electron transfer-degenerative chain transfer living free radical miniemulsion polymerization

XU Jinchao, BAO Yongzhong   

  1. State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China
  • Received:2017-07-31 Revised:2017-11-26 Online:2018-02-05 Published:2018-02-05

单电子转移-蜕化链转移活性自由基细乳液聚合制备PS-b-PBA-b-PS共聚物

徐锦超, 包永忠   

  1. 化学工程联合国家重点实验室, 浙江大学化学工程与生物工程学院, 浙江 杭州 310027
  • 通讯作者: 包永忠

Abstract:

Iodine-terminated poly(butyl acrylate) (I-PBA-I) was prepared by single electron transfer-degenerative chain transfer (SET-DT) living free radical miniemulsion polymerization initiated by iodoform, catalyzed by sodium hydrosulfite/sodium bicarbonate and emulsified by dodecyl sodium sulfate/hexadecane. I-PBA-I was further employed as a macromolecular initiator to initiate styrene SET-DT seeded miniemulsion polymerization to prepare polystyrene-b-poly(butyl acrylate)-b-polystyrene (PS-b-PBA-b-PS) block copolymers. The structure and properties of PS-b-PBA-b-PS copolymers were characterized. Both butyl acrylate and styrene miniemulsion polymerizations exhibit great polymerization rates, and the dosage of initiator can be decreased, which is favor to preparing PBA and PS-b-PBA-b-PS copolymer with high molecular weights. PS-b-PBA-b-PS copolymers exhibit characteristics of micro-phase separation and thermoplastic elastomer. For PS-b-PBA-b-PS copolymer with PS mass fraction of 50%, the ultimate tensile strength and the elongation at break can reach 9.8 MPa and 660%, respectively.

Key words: polymer, emulsion, synthesis, single electron transfer-degenerative chain transfer, block copolymer

摘要:

以碘仿为引发剂、连二亚硫酸钠/碳酸氢钠为催化体系、十二烷基硫酸钠/十六烷为乳化体系,通过单电子转移-蜕化链转移(SET-DT)活性自由基细乳液聚合合成碘端基化聚丙烯酸丁酯(I-PBA-I),进而以其为大分子引发剂引发苯乙烯聚合,制备聚苯乙烯-b-聚丙烯酸丁酯-b-聚苯乙烯(PS-b-PBA-b-PS)三嵌段共聚物,并进行共聚物结构和性能表征。发现两个阶段的SET-DT细乳液聚合均具有大的反应速率,碘仿引发剂用量少,可获得高分子量PBA和PS-b-PBA-b-PS共聚物。PS-b-PBA-b-PS共聚物具有微相分离和热塑性弹性体特征,PS质量分数为50%的嵌段共聚物的拉伸强度达9.8 MPa,断裂伸长率为660%。

关键词: 聚合物, 乳液, 合成, 单电子转移-蜕化链转移, 嵌段共聚物

CLC Number: