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Effect of crystallization on barrier properties of formulated polylactide

Article dans une revue avec comité de lecture
Author
COURGNEAU, Cécile
135726 Ingénierie Procédés Aliments [GENIAL]
DOMENEK, Sandra
135726 Ingénierie Procédés Aliments [GENIAL]
LEBOSSÉ, Régis
GUINAULT, Alain
213743 Propriétés et architectures des alliages et mélanges [P2AM]
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
AVÉROUS, Luc
DUCRUET, Violette
135726 Ingénierie Procédés Aliments [GENIAL]

URI
http://hdl.handle.net/10985/10042
DOI
10.1002/pi.3167
Date
2012
Journal
Polymer International

Abstract

Polylactide (PLA), a biodegradable polymer obtained from biomass, was formulated with a nucleating agent, talc, and a plasticizer, acetyl tributyl citrate, and cold crystallized in α and α′ form. The barrier properties of crystallized PLA were investigated as a function of the formulation and the crystalline form, thanks to three molecules with increasing polymer interactions, i.e. helium, oxygen and ethyl acetate (EA). Contrary to expectation, the oxygen diffusion coefficient in neat and formulated PLA did not decrease with crystallization. Even an increase of the diffusion coefficient was noticed for the most interacting probe, EA, in formulated PLA. Conditioning of neat and formulated PLA in an atmosphere containing EA vapour caused a modification of the material structure by plasticization and induced crystallization even at small EA activities. The plasticizing effect caused the glass transition temperature Tg to shift to below ambient temperature. In the case of neat PLA induced crystallization in solely the α form was obtained, and in the case of formulated PLA a blend of α and α′ forms was observed. Copyright © 2011 Society of Chemical Industry

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