高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (4): 739.

• 论文 • 上一篇    下一篇

氧化-还原引发剂引发苯乙烯超浓乳液聚合的研究

张洪涛, 操建华, 王岸林   

  1. 湖北大学化学与材料科学学院, 武汉 430062
  • 收稿日期:2002-02-01 出版日期:2003-04-24 发布日期:2003-04-24
  • 通讯作者: 张洪涛(1942年出生),男,研究员,主要从事高分子合成和乳液聚合研究.E-mail:zhanghongtao2000@sina.com E-mail:zhanghongtao2000@sina.com
  • 基金资助:

    国家自然科学基金(批准号:29974007)

Concentrated Emulsion Polymerization of the Styrene Initiated by Redox Initiator System at Lower Temperature

ZHANG Hong Tao, CAO Jian Hua, WANG An Lin   

  1. The Faculty of Chemistry and Material Science, Hubei University, Wuhan 430062, China
  • Received:2002-02-01 Online:2003-04-24 Published:2003-04-24

摘要: 以过氧化羟基二异丙苯(CHPO)和四乙烯五胺(TEPA)为氧化-还原引发剂,以十二烷基硫酸钠(SDS)为乳化剂,十六醇(CA)为共乳化剂,通过超浓乳液聚合方法制备了聚苯乙烯乳胶粒子.探讨了乳化剂浓度及配比、分散相体积分数、引发剂种类、引发剂浓度及配比和温度等各因素对乳液稳定性、聚合速率、乳胶粒子大小、形态及分布的影响.用透射电子显微镜(TEM)观察了乳胶粒子的形态,用粘度法测定了聚苯乙烯的粘均分子量.考察了苯乙烯进行超浓乳液聚合的反应动力学,求得在30℃时聚合速率方程为Rp=K[M]0.36[I]0.49[E]0.72,表观活化能为19.72kJ/mol.所得乳胶粒子的直径在0.1~0.3μm之间,粘均分子量在2×106~4×106之间.为低温下实现超浓乳液薄层聚合提供了参考数据.

关键词: 氧化-还原引发剂, 超浓乳液聚合, 聚苯乙烯乳胶, 动力学方程, 稳定性

Abstract: Polystyrene latex particles were prepared by concentrated emulsion polymerization by using (CHPO) TEPA as the redox initiator system and SDS CA as the surfactants. The effects of polymerization condition on the polymerization process were investigated. The effects of surfactant, initiator, temperature and monomers volume fraction on the stability of emulsion, the kinetic process of polymerization and the average size of PS latex particles were discussed. The morphology and size of PS particles were obtained by TEM. The kinetic equation Rp=K[M]0.36[I]0.49[E]0.72 and apparent activation energy Ea=19.72 kJ/mol at 30 ℃. The molecular weight was measured by viscosity method in the range of 2×106-4×106.

Key words: Redox initiator system, Concentrated emulsion plymerization, Polystyrene latex, Kinetic equation, Stability$$$$

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