摘要
采用半连续乳液聚合工艺制备丙烯酸酯乳液,研究乳化剂浓度([E])对聚合动力学和成核机理的影响,并分析不同[E]时整个聚合过程中粒子尺寸分布的演变规律.实验结果表明:当[E]>0.01mol/L时,聚合速率Rp∝[E]1.28,体系遵循胶束成核机理及聚合规律;而当[E]<0.01mol/L时,Rp∝[E]0.17,体系以均相成核为主要成核方式.此外,根据整个聚合过程中的粒子尺寸分布规律可进一步验证体系在不同[E]时具有不同的成核机理.
Acrylate emulsions were prepared by means of semi-continuous emulsion polymerization, and the influence of emulsifier concentration [ E ] on the polymeric kinetics and nucleation mechanism was investigated. Then, the evolvement of particle size distribution with [ E] in the whole polymerization process was analyzed. Experimen- tal results show that the polymerization rate Rp ∝ [ E ] ^1.28 and the nucleation mechanism of the system is ＂micellar nucleation＂ when [ E] is more than 0. 01 mol/L, whereas Rp ∝ [ E] 0.17 and the main nucleation mechanism is ＂homogeneous nucleation＂ when [E] is less than 0.01 mol/L. Furthermore, the particle size distribution of emulsions in the whole polymerization process proves that the nucleation mechanism varies with the value of [ E].
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第5期126-131,共6页
Journal of South China University of Technology(Natural Science Edition)
基金
广东省科技计划项目(2003B10506)
关键词
乳液聚合
胶束成核
均相成核
乳化剂
聚合速率
粒子尺寸分布
emulsion polymerization
micellar nucleation
homogeneous nucleation
emulsifier
polymerization rate
particle size distribution
