泡沫分离法制备聚苯乙烯多孔微球  

Preparation of porous polystyrene microspheres by using foam phase separation

作　　者：姚顺治 单梦醒 朱天赐 司甜[1] 孙彦琳[1] 王红[2] 祝琳华[1] 何艳萍[1] YAO Shunzhi;SHAN Mengxing;ZHU Tianci;SI Tian;SUN Yanlin;WANG Hong;ZHU Linhua;HE Yanping(College of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,Yunnan,China;College of Science,Kunming University of Science and Technology,Kunming 650500,Yunnan,China)

机构地区：[1]昆明理工大学化学工程学院,云南昆明650500 [2]昆明理工大学理学院,云南昆明650500

出　　处：《化工进展》2018年第7期2753-2758,共6页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金地区基金(21466016);国家自然科学基金面上项目(51163009);云南省科技厅面上项目(2016FB024)

摘　　要：以一种新型、简单、高效的溶剂挥发法制备不同孔形态和粒径分布的聚苯乙烯微球。该方法利用机械搅拌和升温过程中溶剂挥发产生的泡沫,将油相液滴夹带进入泡沫相,使溶剂在气相中迅速挥发,诱导聚合物与非良溶剂发生相分离成孔。结果表明:随着聚合物与致孔剂用量比减小,微球结构形态由多孔演变到中空结构;聚乙烯醇(PVA)质量分数由1%增大至3%时,微球的平均粒径由52μm±23μm减小至23μm±20μm及转速由300r/min增大至700r/min时,微球粒径由107μm±40μm减小到45μm±20μm,但由于产生的泡沫量和泡沫形态不同影响了溶剂的挥发过程,故得到微球的多孔形态不同,增大PVA浓度得到的微球表面孔数目较少、孔径较大,而增大转速得到的微球孔数目较多。此外,该方法在油水相比≥1时,在泡沫中也能得到稳定规则的多孔微球,而传统的在水相中引发相分离的方法因水相无法完全分散油相,故无法成球。A novel,simple and efficient method were reported to prepare polystyrene microspheres in foam phase. The key step of the method is that oil droplets were entrained into the foam phase, which was then driven to separate the phases to form porous structures through evaporation of volatile solvent at evaluated temperature. The results showed that the pore morphologies and the particle sizes were influenced by the ratio of polystyrene to porogen（R-PS/HT）, the PVA concentration and the agitation speed. When R-PS/HT was extremely low, the internal structure of the microspheres became hollow. The particle size of the polystyrene microspheres decreased from 52μm±23μm to 23μm±20μm by increasing the PVA concentration from 1% to 3% and that decreased from 107μm±40μm to 45μm±20μm by increasing the agitation speed from 300 r/min to 700 r/min respectively. In addition, the porous morphologies were different with different foaming conditions. The reported method also showed a higher yield than the conventional methods of preparing the porous polymer microspheres in water system, especially when the ratio of oil/water phase is more than 1.

关 键 词：多孔微球 泡沫 相分离 溶剂 聚合物 

分 类 号：TQ31[化学工程—高聚物工业]