高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (1): 148.

• 论文 • 上一篇    下一篇

表面活性单体存在下的MMA/BA乳液共聚合(Ⅱ)聚合动力学及机理

张茂根, 翁志学, 黄志明, 潘祖仁   

  1. 浙江大学高分子科学与工程研究所, 杭州 310027
  • 收稿日期:1999-01-23 出版日期:2000-01-24 发布日期:2000-01-24
  • 通讯作者: 张茂根(1963年出生),男,博士研究生,副教授,主要从事有机硅、涂料和乳液聚合研究.

Emulsion Copolymerization of MMA/BA in the Presence of Surface Active Monomers(Ⅱ)——Kinetics and Polymerization Mechanism

ZHANG Mao-Gen, WENG Zhi-Xue, HUANG Zhi-Ming, PAN Zu-Ren   

  1. Institute of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
  • Received:1999-01-23 Online:2000-01-24 Published:2000-01-24

摘要: 研究了表面活性单体[磺化-十二醇-烯丙基甘油-丁二酸酯钠盐(ZC-L)]的用量对MMA/BA/ZC-L乳液聚合速率和粒径的影响,用CoulterLS230型激光粒径分析仪测定聚合过程中乳液的粒径和粒径分布变化,并与MMA/BA无皂乳液聚合及十二烷基苯磺酸钠存在下的MMA/BA乳液聚合作了比较.[ZC-L]<CMC时,成核机理为均相成核机理,乳胶粒需依靠粒子间的凝聚来提高表面电荷密度而稳定;[ZC-L]>CMC时,成核机理包括均相成核和胶束成核机理,生成的粒子因吸收体系中的表面活性单体而稳定存在.

关键词: 丙烯酸酯, 乳液聚合, 表面活性单体, 动力学, 机理

Abstract: The effects of the amount of surface-active monomers [sodium sulfonated lauryl(allyl glyceryl) succinate, ZC-L] on the polymerization rate and latex particle size in MMA/BA emulsion copolymerization were investigated. The change of average particle size and particle size distribution during the polymerization process was determined with Coulter LS 230 laser particle size analyzer, and compared with those of MMA/BA emulsion polymerization in the presence of sodium dodecyl benzene sulfonate and MMA/BA emulsifier-free emulsion polymerization. The nucleation mechanism is believed to be homogeneous nucleation when [ZC-L]<CMC, and the particles formed are stabilized by the coagulation of the particles each other to increase the surface charge density; the nucleation mechanisms include homogeneous nucleation and micelle nucleation when [ZC-L]>CMC, and the particles are stabilized by absorption of surfmers from the system.

Key words: Acrylate, Emulsion polymerization, Surface active monomer, Kinetis, Mechanizm

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