作　　者： ; ; ; ; ;

机构地区： 华南理工大学化学与化工学院化学工程研究所

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

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

领　　域： [化学工程]