Tetrahydrosalen backboned gadolinium complex as initiator for the ring-opening polymerization of ε-caprolactone

摘要

Tetrahydrosalen ligand was employed in the synthesis of gadolinium complex.The ligand was deprotoned by LiBu,and the afforded lithium salt was reacted with anhydrous GdCl_3 to produce the gadolinium complex through salt metathesis.This complex was successfully used to initiate the ring-opening polymerization ofε-caprolactone.The initiation conditions in different temperature,monomer-to-initiator ratio and time were investigated.Under the condition:[ε-caprolactone]:[catalyst]=600, 56℃,toluene:2 ml,poly(ε-caprolactone)(PCL)with Mw=11,2782 and PDI=1.96 was achieved.