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Biodegradable PLA/PBS multinanolayer membrane with enhanced barrier performances

Type
Articles dans des revues avec comité de lecture
Author
MESSIN, Tiphaine
301288 Institut national des sciences appliquées Rouen Normandie [INSA Rouen Normandie]
MARAIS, Stéphane
301288 Institut national des sciences appliquées Rouen Normandie [INSA Rouen Normandie]
FOLLAIN, Nadège
301288 Institut national des sciences appliquées Rouen Normandie [INSA Rouen Normandie]
GUINAULT, Alain
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
GAUCHER, Valérie
1002334 Unité Matériaux et Transformations - UMR 8207 [UMET]
DELPOUVE, Nicolas
300318 Université de Rouen Normandie [UNIROUEN]
SOLLOGOUB, Cyrille
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]

URI
http://hdl.handle.net/10985/18382
DOI
10.1016/j.memsci.2019.117777
Date
2020
Journal
Journal of Membrane Science

Abstract

Polyester multilayer membranes with more than 2000 alternating layers of poly(lactic acid) (PLA) and poly(butylene succinate) (PBS) were successfully prepared via a nanolayer coextrusion process equipped with a multiplying-element device. This process allows to make films consisting of very thin layers of polymers and in which a confinement effect of the semicrystalline polymer can be induced at point to significantly improve its physical properties. In this work, a homogeneous multinanolayer film of PLA/PBS was obtained without defaults or delamination, while the two polymers are immiscible. Continuous and homogeneous ultrathin layers of PBS (~45 nm) were obtained and the resulting confined structure of PBS led to an improvement of its barrier performances until 30% for oxygen, 40% for water and 70% for carbon dioxide. This improvement was explained by a decrease of the solubility coefficient and surprisingly not by the diffusion coefficient. This result was attributed to a slight orientation of the crystals in the extrusion direction and to the probable presence of an interphase between the layers of PLA and PBS.

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