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Start Over Author "Dubois, Philippe" Search Limiters Peer Reviewed Topic crystallization Topic polylactic acid Publisher universidad simon bolivar, departmento de ciencia de los materiales

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1 results on '"Dubois, Philippe"'

1. ESTUDIO DE LA INFLUENCIA DEL PESO MOLECULAR EN LA FORMACIÓN Y CRISTALIZACIÓN DE ESTEREOCOMPLEJOS BASADOS EN POLI(ÁCIDO LÁCTICO).

Author

Da Silva, Edgar, Michell, Rose Mary, Müller, Alejandro J., and Dubois, Philippe

Subjects
*POLYLACTIC acid, *MOLECULAR weights, *CRYSTALLIZATION, *THERMAL properties, *DIFFERENTIAL scanning calorimetry, *GLASS transition temperature
Abstract

The influence of the molecular weight on the formation and crystallization of PLA stereocomplexes was studied. Equimolar mixtures were prepared from poly (l-lactic acid) (PLLA) and poly (d-lactic acid) (PDLA) in solution. The thermal properties were studied by differential scanning calorimetry (DSC) and compared with the corresponding PLA homopolymers. The melting temperatures of the samples of PLLA / PDLA were higher compared to the homopolymers, indicating the formation of a more stable crystalline structure characteristic of stereocomplexes. It was also found that the stereocomplexes crystallize faster than homopolymers. Moreover it was found that upon increasing the molecular weight of the homopolymers, glass transition temperatures and melting were increased and the crystallization kinetics exhibited a complex trend. [ABSTRACT FROM AUTHOR]

Published
2014

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