甲基丙烯酸丁酯的Nd(Oct)_3-Al(i-Bu)_3配合催化聚合

COORDINATION POLYMERIZATION OF BUTYL METHACRYLATE WITH Nd(Oct)_3-Al(i-Bu)_3

甲基丙烯酸丁酯(BMA)在2-乙基己酸钕[Nd(Oct)_3]和三异丁基铝[Al(i-Bu)_3]配合催化下的聚合反应结果表明。以正己烷和石油醚为溶剂的聚合转化率高于甲苯和四氢呋喃体系。4种不同配体的钕盐的聚合转化率差别不大。但是,以Nd(Oet)_3-Al(i-Bu)_3为催化剂时聚甲基丙烯酸丁酯的分子量最高。聚合反应速度与单体浓度和催化剂浓度均成一次方关系。甲基丙烯酸丁酯的聚合反应活化能为47.40kJ/mol。

In the polymerization of butyl methacrylate catalyzed by Nd(Oct)_3-Al(i-Bu)_3, the conversion in hexane and petroleum ether was found to be higher than that observed in toluene and tetrahydrofuran. The combination of Al(i-Bu)_3 with Nd(Oct)_3 gave the polymer of higher molecular weight than other Nd-complexes:Nd(P_(204))_3, Nd(P_(507))_3 and Nd(naph)_3. Kinetics study showed that the rate of polymerization is first order with respect to the monomer and catalyst concentration. The activation energy of polymerization of butyl methacrylate is 47. 4kJ/mol.