Highly Active, Bifunctional Co(III)-Salen Catalyst for Alternating Copolymerization of CO2 with Cyclohexene Oxide and Terpolymerization with Aliphatic Epoxides
发表时间：2019-03-09
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- 论文类型：
- 期刊论文
- 第一作者：
- Ren, Wei-Min
- 通讯作者：
- Lu, XB (reprint author), Dalian Univ Technol, State Key Lab Fine Chem, Dalian 116012, Peoples R China.
- 合写作者：
- Zhang, Xiao,Liu, Ye,Li, Jian-Feng,Wang, Hui,Lu, Xiao-Bing
- 发表时间：
- 2010-02-09
- 发表刊物：
- MACROMOLECULES
- 收录刊物：
- SCIE、EI
- 文献类型：
- J
- 卷号：
- 43
- 期号：
- 3
- 页面范围：
- 1396-1402
- ISSN号：
- 0024-9297
- 摘要：
- The cobalt(III) complex of a salen ligand bearing one quaternary ammonium salt on the three-position of one aromatic ring is a highly active catalyst for the alternating copolymerization of cyclohexene oxide (CHO) and CO2 to afford the corresponding poly(cyclohexene carbonate) (PCHC) at various temperatures. The cobalt-based catalyst exhibited excellent activity and selectivity for polymer formation at high temperatures up to 120 degrees C and even under low CO2 pressures of 0.1 MPa. Also, the cobalt(III)-salen complex could operate very efficiently for the terpolymerization of CHO and aliphatic epoxides with CO2 to provide selectively polycarbonates with a narrow polydispersity at high temperatures. The polycarbonates resulting from the terpolymerization of equimolar CHO and propylene oxide (PO) with CO2 have a close content for both cyclohexene carbonate and propylene carbonate units. This is ascribed to the presence of CHO significantly inhibiting the reactivity of PO and thereby causing a matched reactivity for both epoxides during the terpolymerization. The competition coordination of CHO and PO to the electrophilic cobalt(III) ion has no effect on regioselective ring-opening of PO in the terpolymerization.
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- 否
