不同单体配比下半连续乳液聚合的成核机理和粒径分布  

Nucleation Mechanism and Particle Size Distribution in Semi-Continuous Emulsion Polymerization with Different Monomer Ratios

作　　者：张心亚[1] 江庆梅[1] 孙志娟[1] 蓝仁华[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6期71-75,共5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：以甲基丙烯酸甲酯(MMA)和丙烯酸丁酯(BA)为反应单体、过硫酸钾(KPS)为引发剂、十二烷基苯磺酸钠(DBS)为乳化剂,研究了半连续乳液聚合中单体配比F(MMA/BA的质量比)对体系成核机理和粒径分布的影响.结果表明:在F较大(≥0.75)时,体系以均相成核与胶束成核两种方式成核,F较小(≤0.5)时,体系主要以胶束成核方式成核;BA、MMA单体均聚合成的乳液粒径小于其共聚时的粒径;成核阶段结束时的转化率突变、颜色突变、粒径突变规律是一一对应的.The effect of the mass ratio of methyl methacrylate （MMA） to butyl acrylate （ BA）, namely F, on the nucleation mechanism and the particle size distribution in semi-continuous emulsion polymerization was investigated, with MMA and BA as the monomers, potassium persulfate （KPS） as the initiator and sodium dodecyl benzene sulfonate （DBS） as the emulsifier. The results show that （ 1 ） the nucleation mechanism of the system is both homogeneous nucleation and micelle nucleation when F is more than 0. 75, while remaining mainly micelle nucleation when F is less than 0.5 ; （2） the particle size of the resulted latex in the homo-polymerization system is smaller than that in the co-polymerization system; and （3） the abrupt transition disciplinarians of the conversion rate, the color and the particle size are correlative to each other at the end of the nucleation process.

关 键 词：半连续乳液聚合 成核机理 粒径分布 单体配比 

分 类 号：TQ331.47[化学工程—橡胶工业]