高等学校化学学报 ›› 1998, Vol. 19 ›› Issue (9): 1518.

• 论文 • 上一篇    下一篇

无皂乳液聚合中单分散粒子的形成过程

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:1997-07-16 出版日期:1998-09-24 发布日期:1998-09-24
  • 通讯作者: 张茂根.男,35岁,博士研究生.
  • 作者简介:张茂根.男,35岁,博士研究生.

Formation of Monodispersed Polymer Particles in Emulsifier free Emulsion Polymerization

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

  1. Institute of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027
  • Received:1997-07-16 Online:1998-09-24 Published:1998-09-24

摘要: 在少量双官能团水溶性共单体(磺化丁二酸-聚乙二醇-烯丙基缩水甘油醚酯)存在下进行MMA/BA无皂乳液聚合,用CoulterLS230激光粒径分析仪研究了乳胶粒子的成核机理和单分散粒子的形成过程.乳胶粒子的成粒过程属多步成粒机理:先均相成核,形成不稳定的初始粒子,然后凝聚成稳定乳胶粒,其粒径分布经历了先变宽后变窄的过程,这是聚合过程中成核-凝聚-增长共同作用,相互竞争的结果.它还导致聚合初期出现周期成核的现象.

关键词: 无皂乳液, 单分散粒子, 形成过程, 成粒机理

Abstract: The nucleation mechanism of polymer latex particles and formation processes of monodispersed latex particles in MMA/BAemulsifier free emulsion polymerization in the presence of small amount of water-soluble comonomer(such as sodium sulfonated polyethylene glycol allyl ether glycerin succinate) were investigated with Coulter LS230 laser particle size analyzer. The colloidally stable polymer latex particles were formed from multi step particle formation mechanism: the coagulation of colloidally unstable precursor particles subsequent to their formation by homogeneous nucleation, and growth due to both aggregation and propagation. The particle monodispersion was not formed in the early stage, but formed through a process of increasing and then decreasing in particle polydispersity, U= Dw/ Dn. This can be ascribed to the competition of homogeneous nucleation coagulation propagation-aggregation, and it also leads to the periodic-nucleation-phenomena in the early stage of polymerization.

Key words: Emulsifier-free latex, Monodispersed particles, Formation processes, Particle formation machanism

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