Nucleation mechanism of MMA/BA semi-continuous emulsion copolymerization

被引：0

作者：

Sun, Zhi-Juan ^{[1
]}

Zhang, Xin-Ya ^{[1
]}

Jiang, Qing-Mei ^{[1
]}

Chen, Huan-Qin ^{[1
]}

机构：

[1] Research Institute of Chemical Engineering, South China University of Technology, Guangzhou 510640, China

来源：

Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and Technology Edition) | 2007年 / 37卷 / 04期

关键词：

Copolymerization - Emulsion polymerization - Mechanisms - Monomers - Particle size - pH - Railroad car buffers;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

In semi-continuous emulsion polymerization with methyl methacrylate (MMA) and butyl acrylate (BA) as the monomers, the influences of the ratio of MMA to MMA and the pH buffer (NaHCO3) on the nucleation process were investigated. The nucleation mechanism was deduced by analyzing the growth of particle size and its distribution during the polymerization process. Experiment results show that the nucleation mechanisms are determined by the molar fraction of MMA (FMMA), when fMMA increases the reaction time of nucleation t1,2 decreases, but the number of emulsion particles Npmax increases at the end of nucleation except BA homogenous polymerization; when fMMA=0.5763, as the amount of NaHCO3 increases the conversion rate of the monomers increases, but t1,2 remains constant, 16 min, which indicates the coexistence of the micellar nucleation and homogenous nucleation mechanisms. The coexistence of the two nucleation mechanisms can also be verified by the analysis of the particle size and distribution of the emulsions.

引用

页码：965 / 970