复合催化剂下二氧化碳与环氧丙烷共聚的研究

Study on the copolymerization of carbon dioxide and propylene oxide over composite catalysts

制备了钴锌双金属氰化物/戊二酸锌复合催化剂(DMC/ZnGA),研究了催化剂的组成对CO2与环氧丙烷共聚反应的影响;采用凝胶渗透色谱、核磁共振谱、红外光谱和热重分析对共聚产物进行了表征,结果表明,钴锌双金属氰化物/戊二酸锌复合催化剂表现出明显的协同效应,能高效催化CO2与环氧丙烷的共聚反应,共聚产物的数均分子量在18 000～31 000;通过调节催化剂的配比,最高催化效率达到168 g-聚合物.(g-催化剂)-1,反应生成共聚产物的反应选择性大于97%。

The double metal cyanide/zinc glutarate （DMC/ZnGA） composite catalyst was prepared. The influence of catalyst component on the eopolymerization of carbon dioxide （CO2 ） with propylene oxide （PO） was investigated. The copolymerization products were characterized by gel permeation chromatography （ GPC ）, 1H nuclear magnetic resonance （ J H NMR） , Fourier-transform infrared spectroscopy （FI-RT） and thermogravimetrie analysis （TGA）. The results indicated that DMC/ZnGA composite catalyst exhibited obviously synergetic effect and high catalytic efficiency for copolymerization of CO2 and propylene. The number average molecular weight of the copolymer was 18 000 - 31 000. The highest catalytic efficiency of 168 g-polymer （g-catalyst）-1 was attained by optimizing the mass ratio of DMC and ZnGA in the catalyst. The selectivity to the copolymer was more than 97%.