Copolymerization of epoxides and carbon dioxide by using double metal cyanide complex (DMC) with high crystallinity |
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| Authors: | Tongchang Zhou Zhiqiang Zou Jianqun Gan Liban Chen Min Zhang |
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| Affiliation: | (1) Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou, 510650, Peoples Republic of China;(2) Graduate School of the Chinese Academy of Sciences, Beijing, 100039, Peoples Republic of China; |
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| Abstract: | Zn3 Co(CN)6]2 based double metal cyanide complex(Co-Zn DMC) is synthesized and characterized by element analysis, FT-IR, TG-FTIR, XRD and
TEM. The composition of Co-Zn DMC summarized by elemental analysis has been confirmed by TG-FTIR. The catalyst has high crystallinity
according to strong crystalline peaks shown in XRD and diffraction spot observed by TEM. Copolymerization of epoxides and
carbon dioxide are successfully catalyzed by Co-Zn DMC. The efficiency of catalysts is as high as 7488 g polymer/g catalyst
for CO2/propylene oxide (PO), 1100 g polymer/g catalyst for CO2/ethylene oxide (EO), which are higher than that reported ever before. The effects of various reaction conditions such as
amount of the catalyst, reaction time and temperature on the copolymerization are investigated. The results show that insertion
of CO2 into chains is significantly affected by the catalyst quantity and ambient temperature. The weight percentage of byproduct
cyclic carbonate can be easily controlled to be less than 5% while the molar fraction of CO2 in backbone (fco2) is more than 30%. |
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