高等学校化学学报 ›› 2004, Vol. 25 ›› Issue (11): 2176-2178.

• 研究简报 • 上一篇    

β-CD存在下MMA细乳液体系的RAFT聚合

邵亚军, 倪沛红, 纪晓丽, 余樟清   

  1. 苏州大学化学化工学院, 江苏省有机合成重点实验室, 苏州215006
  • 收稿日期:2003-10-27 出版日期:2004-11-24 发布日期:2004-11-24
  • 基金资助:

    国家自然科学基金(批准号:20276044)资助

Methyl Methacrylate Miniemulsion Polymerization via RAFT Mechanism Using β-Cyclodextrin as Solubilizer

SHAO Ya-Jun, NI Pei-Hong, JI Xiao-Li, YU Zhang-Qing   

  1. Key Laboratory of Organic Synthesis of Jiangsu Province, School of Chemistry and Chemical Engineering, Soochow University, Suzhou 215006, China
  • Received:2003-10-27 Online:2004-11-24 Published:2004-11-24

关键词: &beta, -CD, RAFT聚合, 细乳液聚合, 甲基丙烯酸甲酯(MMA)

Abstract: The methyl methacrylate(MMA) reversible addition-fragmentation chain transfer(RAFT) miniemulsion polymerization in the presence of β-cyclodextrin(β-CD) was investigated. β-CD is found to act both as an efficient solubilizer for RAFT agent(2-cyanopro-2-yl dithiobenzoate) and as a stabilizer for heterogeneous polymerization. The RAFT miniemulsion polymerizations with or without β-CD were compared in terms of kinetics and the molecular weight distribution. The problem of poor latex stability was observed in this system. A good result of the control over RAFT miniemulsion polymerization of MMA was obtained with β-CD. The increase of the molecular weight of poly(methyl methacrylate) shows a linear relationship with the monomer conversion. The polydispersity index of the polymer with β-CD(PDI=1.18—1.21) is smaller than that without β-CD. TEM photographs showed that the PMMA particles produced with β-CD had smooth surfaces and uniform particle size. Higher amount of sodium dodecyl sulfate and hexadecane was found in favor of improving the controllability of the system. Oil soluble initiator is beneficial to the controllability of the polymerization.

Key words: Cyclodextrin, RAFT polymerization, Miniemulsion polymerization, Methyl methacrylate(MMA)

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