乳化剂对半连续乳液聚合动力学及成核机理的影响  

Effect of Emulsifier on Kinetics and Nucleation Mechanism of Semi-Continuous Emulsion Polymerization

作　　者：孙志娟[1] 张心亚[1] 江庆梅[1] 黄洪[1] 陈焕钦[1] 

机构地区：[1]华南理工大学化工研究所,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》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)

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].

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 

分 类 号：TQ430.1[化学工程]