二元溶剂体系对泡沫传输制备聚苯乙烯微球的影响

doi:10.16085/j.issn.1000-6613.2021-0112

摘要/Abstract

摘要：

采用二氯甲烷（DCM）和丙酮（AC）组成二元溶剂体系，考察了二元溶剂体系对制备聚苯乙烯（PS）微球时泡沫的传输和微球性能的影响，并探讨了对应的作用机理。实验结果表明，随着AC质量分数的增加，体系的出泡温度升高，PS微球的平均粒径下降且粒径分布逐渐变窄，微球的结构由多孔逐渐演变为中空。这主要是由于AC对水具有一定的亲和性，会往连续相迁移，改变连续相的表面张力，并在油水界面形成一个AC/DCM的混合液膜层，该液膜层改变了溶剂挥发的过程，最终实现对微球粒径和结构的调控。

关键词: 多孔聚合物微球, 二元溶剂体系, 泡沫传输, 相分离

Abstract:

The effect of the solvent systems which composed of different ratios of acetone (AC)/dichloromethane (DCM) on the foam-transfer process and properties of PS microspheres were investigated, and the corresponding mechanisms were interpreted. It was found that by increasing the concentration of AC, the foaming temperature increased; while the average particle size of the polystyrene microspheres decreased with narrower particle size distribution and the structure of the PS microspheres evolved from the porous to the hollow. The change on the properties of polymer microspheres was mainly due to the migration of AC from the dispersed phase to the continuous phase, which not only decreased the surface tension but also altered the evaporation process.

Key words: porous polymer microspheres, binary solvent system, foam-transfer, phase separation

中图分类号:

TQ31

余杨, 何艳萍, 罗诗钰, 韩万青, 李贵营, 司甜, 祝琳华, 朱远蹠. 二元溶剂体系对泡沫传输制备聚苯乙烯微球的影响[J]. 化工进展, 2022, 41(1): 320-326.

YU Yang, HE Yanping, LUO Shiyu, HAN Wanqing, LI Guiying, SI Tian, ZHU Linhua, ZHU Yuanzhi. Effect of the solvent systems on preparation of polystyrene microspheres via foam-transfer[J]. Chemical Industry and Engineering Progress, 2022, 41(1): 320-326.

图/表 7

图1 泡沫传输法制备聚合物微球

图2 AC/DCM体系的出泡温度

图3 不同溶剂组成下的泡沫传输过程

图4 AC/DCM溶剂体系微球的平均粒径及其分布

图5 二元体系制备的PS微球的SEM图像

图6 AC/DCM溶剂体系溶剂的迁移情况

图7 AC/DCM溶剂体系对微球结构影响的机理图

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