三羟甲基丙烷三丙烯酸酯-甲基丙烯酸甲酯沉淀聚合制备单分散聚合物微球

发布时间：2018-04-22 09:37

本文选题：三羟甲基丙烷三丙烯酸酯 + 甲基丙烯酸甲酯　；参考：《高分子学报》2016年04期

【摘要】：以三羟甲基丙烷三丙烯酸酯(TMPTA)为交联剂,甲基丙烯酸甲酯(MMA)为共聚单体,偶氮二异丁腈为自由基引发剂,以乙醇或乙醇-水混合物作溶剂,在2 wt%的单体浓度下通过沉淀聚合制备了交联聚合物微球.探究了聚合时间、混合溶剂的含水量以及交联剂TMPTA用量对聚合过程及聚合产物的影响.结果表明,增加TMPTA用量可提高单体转化率和微球产率;所得微球的粒径则随着TMPTA用量的增加而减小.TMPTA用量占单体总量40 wt%至80 wt%,反应时间不少于6 h时可制得高度单分散聚合物微球,产率达到80%以上.在反应介质中加入水可明显提高单体转化率和微球产率,当混合溶剂中水的体积分数为35%时,仍可制得高度单分散聚合物微球,产率可达94%;但当混合溶剂中水的体积分数达40 vol%时,所得微球的多分散系数增大.
[Abstract]:Using trimethylolpropane triacrylate (TMPTA) as crosslinking agent, methyl methacrylate (MMA) as copolymer monomer, azodiisobutyronitrile as free radical initiator, ethanol or ethanol-water mixture as solvent. Crosslinked polymer microspheres were prepared by precipitation polymerization at the monomer concentration of 2 wt%. The effects of polymerization time, water content of mixed solvent and amount of crosslinking agent TMPTA on polymerization process and polymerization products were investigated. The results showed that the monomer conversion and the yield of microspheres could be increased by increasing the amount of TMPTA. The particle size of the obtained microspheres decreased with the increase of the amount of TMPTA. The amount of TMPTA was 40 wt% to 80 wt% of the total monomer and the reaction time was not less than 6 h. The highly dispersed polymer microspheres could be prepared with the yield of more than 80%. The monomer conversion and the yield of microspheres can be improved obviously by adding water to the reaction medium. When the volume fraction of water in the mixed solvent is 35%, the highly monodisperse polymer microspheres can be prepared. The polydispersity coefficient of the obtained microspheres increases when the volume fraction of water in the mixed solvent reaches 40 volg%.
【作者单位】：济南大学化学化工学院;
【基金】：国家自然科学基金(基金号21274054,21304038,51473066)资助项目
【分类号】：O631

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