华南理工大学学报(自然科学版) ›› 2006, Vol. 34 ›› Issue (12): 83-87.

• 化学化工、能源 • 上一篇    下一篇

超声波辅助醋酸乙烯乳液聚合的动力学及机理

侯慧玉 涂伟萍   

  1. 华南理工大学 化工与能源学院, 广东 广州 510640
  • 收稿日期:2005-01-04 出版日期:2006-12-25 发布日期:2006-12-25
  • 通信作者: 侯慧玉(1976-) , 女, 博士生, 主要从事高分子乳液聚合研究. E-mail:houhuiyu@ tom. com
  • 作者简介:侯慧玉(1976-) , 女, 博士生, 主要从事高分子乳液聚合研究.

Dynamics and M echanism of Ultrasonic-Assisted Emulsion Polymerization of Vinyl Acetate

Hou Hui-Yu  Tu Wei-Ping   

  1. Schol of Chemical and Energy Engineering,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China
  • Received:2005-01-04 Online:2006-12-25 Published:2006-12-25
  • Contact: 侯慧玉(1976-) , 女, 博士生, 主要从事高分子乳液聚合研究. E-mail:houhuiyu@ tom. com
  • About author:侯慧玉(1976-) , 女, 博士生, 主要从事高分子乳液聚合研究.

摘要: 针对目前醋酸乙烯聚合中反应速率及单体转化率较低的问题, 以过硫酸钾为引发剂、十二烷基硫酸钠为乳化剂, 采用预乳化间歇聚合工艺, 研究了超声波功率、引发剂用量、乳化剂用量、单体用量、反应温度等因素对超声波辅助醋酸乙烯乳液聚合反应速率的影响, 并对超声波辅助乳液聚合的机理进行了探讨, 分析了超声波影响聚合的途径. 结果表明, 在实验范围内, 外加超声波可以提高聚合反应速率和单体转化率, 聚合反应的表观活化能达51. 55 kJ/mo.l

关键词: 超声波, 乳液聚合, 动力学, 反应机理

Abstract:

In order to improve the reaction rate and monomer conversion of the polymerization of vinyl acetate,PO-tassium persulfate and sodium dodecyl sulfate were used respectively as the initiator an d the emulsifier to produce poly-vinyl acetate by means of pre-emulsification intermittent polymerization.The efects of ultrasonic power,initiator dosage,emulsifier dosage,monomer dosage and reaction temperature on the reaction rate of the ultrasonic-assis-ted emulsion polymerization were then studied.Furtherm ore,the mechan ism of the ultrasonic-assisted emulsion-po ly-merization was discussed,and the approaches of ultrasonic to afect the polymerization were analyzed.Th e results show that,in the experimental conditions of the present study,ultrasonic radiation helps to improve the polymerization rate an d the monomer conversion,and may result in an apparent activation energy of 51.55 kJ/mol.

Key words: ultrasonic, emulsion polymerization, dynamics, reaction mechan ism