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二氧化碳资源丰富,是化学工业中有希望的潜在碳资源。本文介绍一类从二乙基锌和含羧基高聚物反应制得的催化剂。该催化剂可使二氧化碳与环氧丙烷共聚成为交替的聚丙烯碳酸酯。实验证明,苯乙烯与丙烯酸的共聚物是比聚丙烯酸和某些其他聚合物更好的催化剂载体。当金属羧基摩尔比近似于1时,催化活性最高。延长反应时间,使反应产率与产物分子量同时增大。提高反应温度,则在提高反应产率的同时,使反应产物分子量下降。
Rich in carbon dioxide, it is a promising potential carbon source in the chemical industry. This article presents a class of catalysts prepared from the reaction of diethylzinc with carboxyl-containing polymers. The catalyst allows the copolymerization of carbon dioxide with propylene oxide into alternating polypropylene carbonate. Experiments have shown that copolymers of styrene and acrylic acid are better catalyst supports than polyacrylic acid and some other polymers. When the metal carboxyl molar ratio is approximately 1, the catalytic activity is the highest. Extend the reaction time, the reaction yield and the product molecular weight increases at the same time. Increasing the reaction temperature decreases the molecular weight of the reaction product while increasing the reaction yield.