Effect of aqueous phase composition on particle coagulation behavior in batch emulsion polymerization of styrene
Effect of aqueous phase composition on particle coagulation behavior in batch emulsion polymerization of styrene
复制标题
DOI：
10.1016/j.colsurfa.2014.03.100
复制
发表时间：
2014-06
期刊：
影响因子：
--
通讯作者：
Baijun Liu;Mingyao Zhang;Guixia Yu;Dan Chen;Huixuan Zhang
中科院分区：
文献类型：
--
作者：
Baijun Liu;Mingyao Zhang;Guixia Yu;Dan Chen;Huixuan Zhang
先前，我们研究了由电解质诱导的丙烯酸正丁酯的乳液聚合中的胶乳颗粒凝聚（Colloid PolymSci 291（2013）2385-2398）。然而，没有研究粒度分布与单体转化率和反应时间的关系，以及操纵颗粒凝聚以控制粒度和多分散性的可能性。在本研究中，我们研究了苯乙烯乳液聚合过程中粒径分布随单体转化率和反应时间的变化。此外，还详细研究了不同水相组成下颗粒的凝聚情况。实验结果表明，颗粒的粒径和多分散性受颗粒凝聚的控制，并通过改变水相中电解质或甲醇的含量来调节颗粒的凝聚。随着电解质或甲醇的增加，最终的胶乳粒径在89.2-265.9 nm范围内增加。还考虑了水相组成对最终胶乳的多分散指数（PDI）的影响。在适当的水相组成下，最终胶乳的PDI达到0.005。有趣的是，当电解质浓度> 1.2wt%或甲醇/水比> 30/70时，容易发生破乳现象。
Previously, we studied the latex particle coagulation in the emulsion polymerization of n-butyl acrylate induced by an electrolyte (Colloid Polym Sci 291 (2013) 2385–2398). However, the evolution of particle size distribution vs. monomer conversion and reaction time, and the possibility for the manipulation of particle coagulation to control particle size and polydispersity were not studied. In this study, we investigated the evolution of particle size distribution vs. monomer conversion and reaction time during the emulsion polymerization of styrene. Moreover, the particle coagulation at different aqueous phase compositions was studied in details. The experimental results indicate that the particle size and polydispersity was controlled by particle coagulation, which was adjusted by varying the content of electrolyte or methanol in the aqueous phase. The final latex particle size increased in the range 89.2–265.9 nm with increasing electrolyte or methanol. The effect of aqueous phase composition on the polydispersity index (PDI) of the final latex was also considered. The PDI of the final latex reached 0.005 at an appropriate aqueous phase composition. Interestingly, the demulsification phenomenon easily occurred at electrolyte concentration > 1.2 wt% or methanol/water ratio > 30/70.