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Multi-scale analysis of the impact of polylactide morphology on gas barrier properties

Article dans une revue avec comité de lecture
Author
FERNANDES NASSAR, Samira
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
GUINAULT, Alain
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
DELPOUVE, Nicolas
300318 Université de Rouen Normandie [UNIROUEN]
DIVRY, Véronique
135726 Ingénierie Procédés Aliments [GENIAL]
DUCRUET, Violette
135726 Ingénierie Procédés Aliments [GENIAL]
SOLLOGOUB, Cyrille
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
DOMENEK, Sandra
135726 Ingénierie Procédés Aliments [GENIAL]

URI
http://hdl.handle.net/10985/11598
DOI
10.1016/j.polymer.2016.11.047
Date
2017
Journal
Polymer

Abstract

Semicrystalline polylactide (PLA) films with controlled morphology were produced by thermal crystallization to optimize the oxygen barrier properties. The crystalline morphology of PLA at the scales of the lamella and the spherulite was investigated and the mobile amorphous phase dynamics were studied. The crystalline morphology had a negligible impact on the oxygen diffusion coefficient. The occurrence of a rigid amorphous fraction (RAF) in the amorphous phase due to its insufficient decoupling from the crystalline phase provided an accelerated pathway for diffusion, though. As a conclusion, for reaching optimal barrier properties, semicrystalline PLA should be pre-nucleated and rapidly crystallized from the glass in the α-polymorph in the aim to reach a high crystallinity degree and decoupling of the amorphous and the crystalline phase. These recommendations can benefit to industry for the optimization of PLA annealing treatments.

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