以黄原酸钾为链转移剂的甲基丙烯酸甲酯可逆加成断裂链转移聚合

RAFT Polymerization of Methyl Methacrylate with Potassium Xanthate as Chain Transfer Agent

以黄原酸钾为链转移剂,偶氮二异丁腈为引发剂,甲苯为反应溶剂,进行甲基丙烯酸甲酯的可逆加成断裂链转移(RAFT)自由基聚合。研究了聚合温度、反应时间及引发剂用量对单体转化率和所得聚合物相对分子质量及其分布的影响。结果表明,随着反应温度的升高,单体转化率和相对分子质量都不断增大;随着反应时间的延长,单体转化率、相对分子质量持续增加;随着引发剂用量增加,相对分子质量持续下降。得到的聚合物相对分子质量分布在一个可控的范围(1.5左右,最低为1.27)。

Using potassium xanthate as chain transfer agent, 2,2＇-azobis （2-methylpropionitrile） as initiator, and toluene as reaction solvent, free radical polymerization of methyl methacrylate was carried out via reversible addition- fragmentation chain transfer （RAFT） polymerization. The effects of polymerization temperature, reaction time, and amount of initiator on monomer conversion as well as molecular weight and molecular weight distribution of polymer were investigated. The results show that with the reaction temperature increasing, monomer conversion and molecular weight increase. Increasing reaction time results in increasing of monomer conversion and molecular weight. As the amount of initiator increases, molecular weight decreases continuously. The molecular weight distribution of polymer is in a controllable scale of 1.5 or so （the lowest is 1.27）.