高等学校化学学报

高等学校化学学报 ›› 2013, Vol. 34 ›› Issue (6): 1536.doi: 10.7503/cjcu20130006

• 高分子化学 • 上一篇    下一篇

超临界CO2中苯乙烯RAFT分散聚合

刘小伟, 李慧, 赵镇, 缪夏然, 韩哲文   

  1. 华东理工大学材料科学与工程学院, 上海 200237
  • 收稿日期:2013-01-04 出版日期:2013-06-10 发布日期:2013-04-22
  • 通讯作者: 李慧,女,博士,副教授,主要从事含氟高分子及可控聚合研究.E-mail:lihui@ecust.edu.cn E-mail:lihui@ecust.edu.cn
  • 基金资助:

    上海市自然科学基金(批准号: 10ZR1407600)资助.

RAFT Dispersion Polymerization of Styrene in Supercritical CO2

LIU Xiao-Wei, LI Hui, ZHAO Zhen, MIAO Xia-Ran, HAN Zhe-Wen   

  1. School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China
  • Received:2013-01-04 Online:2013-06-10 Published:2013-04-22

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摘要：

以末端带有三硫代碳酸酯的聚二甲基硅氧烷(PDMS-TTC)为大分子链转移剂, 在超临界CO2中通过苯乙烯的可逆加成-断裂链转移(RAFT)聚合制备了聚二甲基硅氧烷-b-聚苯乙烯(PDMS-b-PS)嵌段共聚物, 对聚合反应动力学以及产物的组成、 分子量和形貌等进行了表征. 由于PDMS链段可溶于超临界CO2而PS链段不溶, 因此在超临界CO2中制备PDMS-b-PS嵌段共聚物的过程是以嵌段共聚物自身作为分散稳定剂的RAFT分散聚合, 产物为粒径较均一的球形颗粒.

关键词: 可逆加成-断裂链转移(RAFT)聚合, 超临界CO2, 分散聚合, 嵌段共聚物

Abstract:

A block copolymer polydimethyllsiloxane-b-polystyrene(PDMS-b-PS) was prepared by reversible addition fragmentation chain transfer(RAFT) polymerization of styrene in supercritical CO2(scCO2), using polydimethylsiloxane terminated by trithiocarbonate(PDMS-TTC) as a macromolecular chain transfer agent. The polymerization reaction kinetics, composition, molecular weight and morphology of the product were investigated by FTIR, 1H NMR, GPC and SEM. Since PDMS chain segments could be dissolved in scCO2 while PS segments were insoluble, the polymerization was a RAFT dispersion polymerization using the block copolymer itself as a dispersion stabilizer, and the resultant products were spherical particles with more uniform particle size, which was proved by SEM characterization.

Key words: Reversible addition fragmentation chain transfer(RAFT) polymerization, Supercritical CO2, Dispersion polymerization, Block copolymer

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