Zn-Co DMC催化合成环氧丙烷-二氧化碳共聚物

Copolymerization of Propylene Oxide with Carbon Dioxide Catalyzed by Zn-Co Double Metal Cyanide Complexes

制备了基于Zn3[Co(CN)6]2的双金属氰化络合物催化剂,考察了在不同反应条件下催化环氧丙烷/二氧化碳共聚反应的催化性能以及反应条件对产物组成的影响.结果表明:该催化剂能高效催化共聚反应,催化效率可达2 000 g/gZn3[Co(CN)6]2以上.共聚产物经FT-IR和1H NMR表征,在适宜反应条件下共聚物中二氧化碳摩尔分数可达到0.3以上,产物中也有少量环加成产物碳酸亚丙酯,较低的温度和较高的压力有利于二氧化碳转化为共聚物.

Double metal cyanide complex （DMC） based on Zn3 [Co（CN）6]2 was prepared and employed as catalyst for the copolymerization of propylene oxide and carbon dioxide. Effects of reaction conditions on catalytic performance and the compositions of products were investigated. The results show that these catalysts demonstrate highly catalytic activity over 2 000 g copolymer per gram of Zn3 [Co（CN）6]2. The copolymers prepared were characterized by FT-IR,^1 H NMR, and the molar fraction of CO2 for copolymer （FCO2） was as high as 0.3 under optimum condition,coupling product of propylene carbonate was also identified as co-product. It is also found that lower temperature and high reaction pressure are favorable for incorporation of CO2 into copolymer.