Preparation and Characterization of Poly(ethylene glycol)/Poly(L-lacticacid) Copolyesters via Direct Melt Polycondensation

Copolyesters consisting of poly(ethylene glycol) (PEG) and L-lactic acid (LA) were synthesized in presence of H3PO4 as catalyst. Five samples were prepared by changing the molar ratio of PEG/LA. The chemical compositions of these copolyesters were characterized by H-NMR, FTIR and the molecular weight and its distribution were measured by gel permeation chromatography. The results show that samples with 1:1 and 1:5 (PEG/LA) molar ratios may offer greater potential for application as polyol in synthesis of polyurethane

کلیدواژه ها:

L-lactic acid ، Polyethylene glycol ، Copolyester ، Biodegradable