Abstract
Isothermal and non-isothermal crystallization kinetics of poly- l-lactide (PLLA) were studied in order to analyse the effect of crystalline and amorphous morphology on hydrolytic degradation. A modification of the nucleation/growing mechanism was observed in both isothermal and non-isothermal analysis. Samples isothermally crystallized at T c<110°C showed a higher fraction of amorphous phase which does not relax at T g. Lower and decreasing values of this ’rigid-amorphous phase’ fraction were detected at higher crystallization temperatures ( T c>110°C). The effect of hydrolytic degradation on the amorphous and crystalline phases depends upon the initial morphology developed during the isothermal crystallization. The larger crystals developed at T c=130°C are more resistant to erosion compared to the less perfect and smaller crystals developed at higher levels of undercooling ( T c=90°C).
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