Kong Xiang Zheng, Gu Xiang Ling, Zhu Xiaoli, Zhang Lina
College of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, P. R. China.
Macromol Rapid Commun. 2009 Jun 2;30(11):909-14. doi: 10.1002/marc.200800772. Epub 2009 Mar 16.
The precipitation polymerization of styrene-trihydroxymethyl propane triacrylate has been carried out using ethanol and an ethanol/water mixture as the solvent. Uniform microspheres with high monomer conversion are achieved within 4 h, a much shorter polymerization time than that reported for the precipitation polymerization of divinyl benzene-styrene in acetonitrile. The results clearly demonstrate that use of water as a co-solvent is indeed very effective to promote the polymerization to high conversion and to obtain uniform microspheres. With no water under the otherwise same experimental conditions, only about 57% of monomer conversion is obtained; while the monomer conversion is remarkably increased to 96% when 12 vol.-% of water is used.
以乙醇和乙醇/水混合物为溶剂进行了苯乙烯-三羟甲基丙烷三丙烯酸酯的沉淀聚合反应。在4小时内可获得具有高单体转化率的均匀微球，聚合时间比在乙腈中进行二乙烯基苯-苯乙烯沉淀聚合报道的时间短得多。结果清楚地表明，使用水作为共溶剂确实非常有效地促进聚合反应达到高转化率并获得均匀的微球。在其他实验条件相同的情况下，不加水时，单体转化率仅约为57%；而当使用12体积-%的水时，单体转化率显著提高到96%。
