摘要
The ring-opening polymerization (ROP) of ε-caprolactone (ε-CL) using lanthanide thiolate complexes [(CH3CsH4)2Sm(μ-SPh)(THF)]2 (1) and Sm(SPh)3(HMPA)3 (2) as initiators has been investigated for the first time. Both of 1 and 2 were found to be highly efficient initiators for the ROP of ε-CL. The poly(ε-caprolactone) (PCL) with molecular weight Mn up to 1.97 ×10^5 and relatively narrow molecular weight distributions (1.20〈MW/Mn〈 2.00) have been obtained in high yield in the temperature range of 35-65℃. According to the polymer yield, 2 showed much higher activity than 1. However, the number-average molecular weight of PCL obtained with 2 was much lower than with 1. The possible polymerization mechanism of the ε-CL polymerization has been proposed based on the results of the end group analysis of the ε-CL oligomer.
The ring-opening polymerization (ROP) of ε-caprolactone (ε-CL) using lanthanide thiolate complexes [(CH3CsH4)2Sm(μ-SPh)(THF)]2 (1) and Sm(SPh)3(HMPA)3 (2) as initiators has been investigated for the first time. Both of 1 and 2 were found to be highly efficient initiators for the ROP of ε-CL. The poly(ε-caprolactone) (PCL) with molecular weight Mn up to 1.97 ×10^5 and relatively narrow molecular weight distributions (1.20〈MW/Mn〈 2.00) have been obtained in high yield in the temperature range of 35-65℃. According to the polymer yield, 2 showed much higher activity than 1. However, the number-average molecular weight of PCL obtained with 2 was much lower than with 1. The possible polymerization mechanism of the ε-CL polymerization has been proposed based on the results of the end group analysis of the ε-CL oligomer.
基金
Project suported by the National Natural Science Foundation of China (No. 20272040).