Study of electronic effect in bifunctional catalysts for the copolymerization of CO2 and PO/CHO,Journal of the Chinese Chemical Society

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Study of electronic effect in bifunctional catalysts for the copolymerization of CO2 and PO/CHO
Journal of the Chinese Chemical Society ( IF 1.6 ) Pub Date : 2020-05-07 , DOI: 10.1002/jccs.202000103
Yang Hu ₁ , Longchao Du ₁ , Cun Li ₁ , Jiale Shen ₁ , Weiju Zhu ₁ , Chenxi Shao ₁

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Carbon dioxide (CO₂) is an easily available renewable carbon source that can be used as a comonomer in the catalytic ring‐opening polymerization of epoxides to form aliphatic polycarbonates. Herein, a series of new Salen‐Co(III) bifunctional catalysts were synthesized for the first time, and they were studied to catalyze the copolymerization of CO₂ and propylene oxide (PO)/cyclohexene oxide (CHO). At the same time, the effects of reaction conditions (electronic effect, temperature, time) on catalytic activity and selectivity were investigated. The results show that the Salen‐Co(III) complexes with electron‐withdrawing groups have higher selectivity and activity for propylene carbonate (PPC)/cyclohexylene carbonate (PCHC). At the same time, the Salen‐Co(III) complexes can better catalyze the copolymerization of CHO and CO₂ than that of PO and CO₂. The catalytic efficiency of the four complexes increased with increasing temperature, and the best reaction condition is 80°C, 30 min and 2 MPa of CO₂.

中文翻译：

双功能催化剂中CO2与PO / CHO共聚反应的电子效应研究

二氧化碳（CO ₂）是一种容易获得的可再生碳源，可以在环氧化物催化开环聚合反应中形成脂肪族聚碳酸酯时用作共聚单体。本文中，首次合成了一系列新型的Salen-Co（III）双功能催化剂，并进行了研究以催化CO ₂的共聚。和环氧丙烷（PO）/环己烯氧化物（CHO）。同时，研究了反应条件（电子效应，温度，时间）对催化活性和选择性的影响。结果表明，具有吸电子基团的Salen-Co（III）配合物对碳酸亚丙酯（PPC）/碳酸亚环己酯（PCHC）具有更高的选择性和活性。同时，Salen-Co（III）配合物比PO和CO ₂更好地催化CHO和CO ₂的共聚。四种配合物的催化效率随温度的升高而提高，最佳反应条件为80°C，30 min和2 MPa的CO ₂。

更新日期：2020-05-07

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