以叶绿素a为光引发剂的MMA活性自由基聚合

Controlled/“Living” Radical Polymerization of MMA with Chlorophyll a as Photoinitiator

以叶绿素a为光引发剂,甲基丙烯酸甲酯为单体,以溴化铁为催化剂,2-溴代异丁酸乙酯(EBi B)为ATRP引发剂,在二甲亚砜中合成了分子量及分子量分布可控的聚甲基丙烯酸甲酯.在此基础上,进一步研究了叶绿素的用量、照射时间、催化剂的量对光聚合反应转化率的影响.并用红外光谱得到的聚甲基丙烯酸甲酯进行表征.从实验结果得到制备聚甲基丙烯酸甲酯的最佳制备实验参数.

When Chlorophyll a was used as photoinitiator,photo- induced living radical polymerization of MMA was successfully carried out at room temperature in dimethyl sulfoxide（ DMSO） with 2- bromoisobutyric acid ethyl ester（ EBi B） as the initiator and iron bromide（ Fe Br3） as catalyst. The effects of irradiation time amount of chlorophyll a and those of catalyst amount on the polymerization were discussed. The optimum conditions for controlled /‘living＇of MMA are that the amount of chlorophyll a is 10 ppm,that of Fe Br3 i is 0. 1 ×10- 3mol and the irradiation time is 5 h. The PMMA is characterized by the FT- IR.