Ring-opening Polymerization of ε-Caprolactone Catalyzed by Rare Earth Chloride

Abstract

Abstract: Ring-opening polymerization of ε-caprolactone catalyzed by rare earth chloride dissolved in N,N-dimethylformamide and adding a small amount of propylene oxide was studied.The optimum conditions for the ring-opening polymerization of CL are as follows.In the bulk polymerization: n(DMF)/n(LaCl₃)=10,n(PO)/n(LaCl₃)=20,aging temperature: 30 ℃,aging time: 1 h,c(CL)=7.91×10^-3 mol/L,c(LaCl₃)=1.58×10^-5 mol/L,the polymerization carried out at 30 ℃ for 1 h,yield=83.3%,M_ν=1.93×10⁴.In the solution polymerization: n(DMF)/n(LaCl₃)=10,n(PO)/n(LaCl₃)=20,aging temperature: 30 ℃,aging time: 1 h,toluene as the solvent,c(CL)=4.22×10^-3 mol/L,c(LaCl₃)=8.43×10^-6 mol/L,the polymerization was carried out at 30 ℃ for 2 h,yield=62.9%,M_ν=1.21×10⁴.

Key words: Rare earth chloride, N,N-Dimethylformamide, Propylene oxide, ε-Caprolactone, Ring-opening polymerization

CLC Number:

O631

TrendMD:

YANG Xiong-Fa, NI Xu-Feng, SHEN Zhi-Quan . Ring-opening Polymerization of ε-Caprolactone Catalyzed by Rare Earth Chloride[J]. Chem. J. Chinese Universities, 2005, 26(10): 1966.

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Ring-opening Polymerization of ε-Caprolactone Catalyzed by Rare Earth Chloride

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