Ring-opening polymerization of ε-caprolactone catalyzed by lanthanum tris(2, 6-di-tert-butylphenolate)
SHEN Li-juan1, QU Dan2, WANG Yan3*
(1 Institute of Material Chemistry, Shanxi Normal University, Linfen 041004, Shanxi, China; 2 Environment Monitoring Center of Jilin Province, Changchun 130022, Jilin, China; 3 The Center of Analysis and Test, Shanxi Normal University, Linfen 041004, Shanxi, China)
Abstract:
Ring-opening polymerization of ε-caprolactone (ε-CL) has been carried out by using single component lanthanum tris(2,6-di-tert-butylphenolate) ［La(ODTBP)3］．The effects of reaction conditions on the polymerization were explored. The experimental results show that La(ODTBP)3 can catalyze ε-CL polymerization effectively in toluene. And at optimum condition, number average molecular weight of PCL of 18.5×104 is achieved in conversion of 99.4%. The polymers were characterized by GPC, DSC and 1H NMR. Analyse results revealed that ε-CL polymerization proceed through “coordination-acyl-oxygen bond scission-insertion” mechanism.
KeyWords:
ε-caprolactone; ring-opening polymerization; lanthanum tris(2,6-di-tert- butylphenolate)
