FeBr_3/Me_6TREN催化MMA反向原子转移自由基聚合研究

Reverse Atom Transfer Radical Polymerization of MMA Catalyzed by FeBr-3/Me-6TREN

对FeBr3/Me6TREN催化的反向原子转移自由基聚合进行了研究.在不同的催化剂、引发剂的配比、聚合温度和配体用量等条件下,该催化体系催化的MMA聚合反应动力学为一级反应,聚合物分子量可控,分子量分布很窄,说明该体系催化的聚合反应为活性可控聚合.通过实验计算了反应的活化能,并利用UV光谱对催化剂进行了研究.

The reverse atom transfer polymerization of MMA catalyzed by FeBr3/Me6TREN was studied in this paper. The molecular weight increased with the increase of the conversion and was in a good agreement with the theoretical value. The molecular weight distribution of the resulted PMMA was very narrow （1.06）. These results indicate that the polymerization was well-controlled. The effect of morlar ratio of catalyst to initiator and FeBr3 to ligand Me6TREN on the control of the polymerization were studied. In addition, the activation energy of polymerization of MMA was calculated to be 29.35 kJ/mol, which was a bit smaller than that of Cl-mediated reverse ATRP.