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通过悬浮聚合法制取了分子量在100万~150万范围的聚甲基丙烯酸甲酯(PMMA)。研究了温度、引发剂浓度、转化率对聚合物分子量的影响情况,用粘度法测量了PMMA的分子量。结果表明:温度升高、引发剂用量增加使得聚合物分子量降低;随反应的进行和单体转化率提高,聚合物分子量增大并趋于定值。在单体∶水相=1∶5(质量比),过氧类引发剂浓度1%,反应温度60~70℃,反应时间5h左右的实验条件下,制备得到了高分子量PMMA。
Polymethylmethacrylate (PMMA) with a molecular weight in the range of 1 million to 1.5 million was prepared by suspension polymerization. The effects of temperature, initiator concentration and conversion on the molecular weight of the polymer were investigated. The molecular weight of PMMA was measured by viscosity method. The results showed that the molecular weight of the polymer decreased with the increase of temperature and the amount of initiator. With the progress of reaction and monomer conversion, the molecular weight of polymer increased and tended to be fixed. The high molecular weight PMMA was prepared under the experimental conditions of monomer: aqueous phase = 1: 5 (mass ratio), peroxy initiator concentration 1%, reaction temperature 60 ~ 70 ℃ and reaction time 5h.