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采用聚(苯乙烯-丙烯酰胺)载体氯化钕配合物催化剂催化合成聚苯乙烯,研究了Al、Nd摩尔比、单体浓度、不同类型催化剂、反应时间和温度对催化聚合活性、单体转化率、相对分子量的影响规律。结果表明,Al、Nd摩尔比为200、单体浓度为0.25 g/mL,聚合时间为5h,聚合温度为60℃,催化活性达到最大。氯化钕配合物的催化活性高于稀土氯化物,聚合物载体氯化钕配合物催化性能高于同类小分子体系配合物。动力学研究表明,聚合反应速率与单体和主催化剂钕的浓度分别呈1次方关系,聚合反应的表观活化能为Ea=94.03kJ。
The poly (styrene-acrylamide) supported neodymium chloride complex catalyst was used to catalyze the synthesis of polystyrene. The effects of Al, Nd molar ratio, monomer concentration, different types of catalysts, reaction time and temperature on the catalytic activity, Rate, the impact of molecular weight rules. The results showed that the molar ratio of Al to Nd was 200, the monomer concentration was 0.25 g / mL, the polymerization time was 5h and the polymerization temperature was 60 ℃, the catalytic activity reached the maximum. The catalytic activity of neodymium chloride complex is higher than that of rare earth chloride. The catalytic performance of the polymer carrier neodymium chloride complex is higher than that of the similar small molecule system complexes. Kinetic studies show that the polymerization rate and monomer and the concentration of neodymium catalyst were the first-order relationship, the apparent activation energy of the polymerization reaction was Ea = 94.03kJ.