反相微乳法制备DMCC用于催化二氧化碳与环氧丙烷共聚

DMCC Prepared via Reverse Microemulsion Method and Catalytzed Copolymerization of Carbon Dioxide with Propylene Oxide

通过反相微乳法和共沉淀法合成了钴锌双金属氰化物催化剂。研究了制备方式及共聚反应条件对其催化性能及聚碳酸酯组成的影响。结果表明,反相微乳法制备的DMCC-1具有较低的结晶度且可以配合更多的有机配体,在80℃、4 MPa条件下,采用一步加料法催化CO2与环氧丙烷共聚,所制备的聚碳酸酯中碳酸酯单元量达43.5%,数均分子量达36 400,且聚合物分散指数仅为2.07。共聚结果表明,一步加料法有利于提高聚合物的数均分子量,而逐步加料法有利于降低聚合物的相对分子量分布。

Cobalt zinc double metal cyanide catalysts were prepared by reverse micro emulsion method and coprecipitation method.The effect of preparation and reaction condition on catalytic performance and the polycarbonate composition were investigated.The results revealed that DMCC-1 prepared by reverse microemulsion method had lower crystallinity and complexed more organic ligand.The polycarbonate synthesized from CO2 and propylene oxide in the presence of DMCC-1 under the conditions of 80 ℃,4 MPa and one-step feed modepossessed the molar fraction of carbonate linkages in the produced polymer was 43. 5%,number average molecular mass up to 36 400 and polydispersity index was 2. 07.At the same time,it was found that the one-step feed mode could improve the number average molecular of the polycarbonate,but interval feed mode could reduce the polydispersity index of the polycarbonate.