摘要
The biphenol based discrete ion-pair rare earth complexes, [Ln（EDBP）2（DME）Na（DME）3] [Ln = Er（1）, Yb（2）, Sm（3）], were prepared and used as catalysts for the ring-opening polymerization （ROP） of 2,2-dimethyltrimethylene carbonate （DTC）. Three complexes show moderate activities for the polymerization, and the catalytic activities increase in the following sequence： （Yb 〈 Er 〈 Sm）. The effect of different ratios of [DTC]/[Ln], polymerization temperature and time on the polymerization was investigated. Moreover, PDTC without ether unit developed from possible CO2 elimination was prepared.
The biphenol based discrete ion-pair rare earth complexes, [Ln（EDBP）2（DME）Na（DME）3] [Ln = Er（1）, Yb（2）, Sm（3）], were prepared and used as catalysts for the ring-opening polymerization （ROP） of 2,2-dimethyltrimethylene carbonate （DTC）. Three complexes show moderate activities for the polymerization, and the catalytic activities increase in the following sequence： （Yb 〈 Er 〈 Sm）. The effect of different ratios of [DTC]/[Ln], polymerization temperature and time on the polymerization was investigated. Moreover, PDTC without ether unit developed from possible CO2 elimination was prepared.
基金
supported by the National Natural Science Foundation(No.20674071)
the Special Funds for Major State Basic Research Projects(No.2005CB623802)
