The Effect of Oxygen to Salen-Co Complexes for the Copolymerization of PO/CO 2
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ARTICLE
POLYMER SCIENCE
https://doi.org/10.1007/s10118-020-2451-5 Chinese J. Polym. Sci.
The Effect of Oxygen to Salen-Co Complexes for the Copolymerization of PO/CO2 Ran-Long Duana,b, Yan-Chuan Zhoua, Zhi-Qiang Suna, Yue-Zhou Huanga,b, Xuan Panga,b*, and Xue-Si Chena,b* a Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China b University of Science and Technology of China, Hefei 230026, China
Electronic Supplementary Information Abstract A series of Salen-Co(II) complexes were synthesized to study the effect of O2 on the catalytic performance of Salen-Co complexes for the copolymerization of PO/CO2. The Salen-Co(II) complexes showed low activity on the cyclo-addition of CO2 to PO with the aid of a cocatalyst such as PPNCl. Unexpectedly, with the addition of O2, the activity of Salen-Co(II) complexes was obviously increased and 100% cyclic carbonate was obtained. As the pressure of O2 increased, the activity of the complex also increased. With the existence of O2, the activity of the complexes was influenced by their structures and the pressure of O2, and the complexes with the conjugated structure showed higher activity. The structures of cocatalyst also played a crucial role as for the change of the activity. By altering the electrophilicity of Salen-Co(III), O2 can also be used as cocatalyst for the copolymerization of PO/CO2. Keywords Salen-cobalt; Epoxides; Carbon dioxide; Copolymerization Citation: Duan, R. L.; Zhou, Y. C.; Sun, Z. Q.; Huang, Y. Z.; Pang, X.; Chen, X. S. The effect of oxygen to Salen-Co complexes for the copolymerization of PO/CO2. Chinese J. Polym. Sci. https://doi.org/10.1007/s10118-020-2451-5
INTRODUCTION As a kind of greenhouse gas, CO2 is considered as one of the prime reasons for the climate change and global warming. Reduction of the emissions and the concentration of CO2 in the environment has become a globe issue that could affect the sustainable development of human society.[1−3] Therefore, the application of CO2 has received widespread attention. As a source of nontoxic, abundant, inexpensive, and sustainable C1 feedstock, CO2 has been used in the chemical industry for the production of urea, carboxylic acids, methanol, cyclic carbonates, and polycarbonates.[4−6] Cyclic carbonates can be prepared by cyclo-addition of CO2 to epoxides and have been widely used as electrolytes for batteries, aprotic solvents, monomers for polymerizations, and intermediates of chemical syntheses,[7−10] while polycarbonates can be prepared by copolymerization of CO2 with epoxides and show potential applications as packaging materials, coatings, adhesives, and in many other fields.[11−14] Due to the high stability and low reactivity of CO2, a large number of catalytic systems such as organocatalysts and metal-based catalysts such as K, Mg, Ca, Fe, Cr, Zn, Al, and rare earth metals have been ex
* Corresponding authors, E-mail: [email protected] (X.P.) E-mail: [email protected] (X.S.C.) Special Issue: Bio-ba
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