Journal
EUROPEAN POLYMER JOURNAL
Volume 36, Issue 5, Pages 901-908Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0014-3057(99)00155-X
Keywords
poly(lactic-glycolic acid); PLGA; diol-terminated poly(epsilon-caprolactone); block copolymers; bioerodible polymers; thermal properties; dynamic-mechanical properties
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The results of differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and dynamic-mechanical thermal analysis (DMTA) investigations performed on a new class of multi-block copolymers based on poly(D,L-lactic-glycolic acid) (PLGA) and diol-terminated poly(epsilon-caprolactone) (PCDT) segments are reported. The synthesis and molecular weight characterisation of these materials, having a structure of poly(ester-carbonate)s, were described in a recent paper. In the present work the influence of the length of PCDT segments and of the molar ratio between the D,L-lactic acid (LA) and glycolic acid (GA) residues on thermal stability, degree of crystallinity and glass transition temperature (T-g) has been investigated. Materials completely amorphous or having variable degrees of crystallinity have been obtained modulating the above parameters. The TGA traces run under nitrogen atmosphere exhibit two degradation processes that can be ascribed to the PLGA and PCDT segments, respectively. In addition, the thermal-stability increases with the LA content in the PLGA blocks. (C) 2000 Elsevier Science Ltd. All rights reserved.
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