Thermogravimetric investigation of two classes of block coplymers based on poly(lactic-glycolic acid)and poly(ε-caprolactone) or poly(ethylene glycol)

摘要

The thermogravimetric analysis(TGA)of two classes of multi-block copolymers based on poly(D,L-lactic-glycolic acid)(PLGA) and diol-terminated poly(ε-caprolactone)(PCDT)or poly(ethylene glycol(PEG)segments is reported. These materials, having the structure of poly(ester-carbonate)s, were synthesized by a chain extension reaction. The influence of the length of PCDT or PEG segments and of the molar ratio of D,L-lactic acid(LA)and glycolic acid(GA)residues on thermal stability in air and nitrogen atmosphere has been investigated.