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mpact of ZnO nanoparticle morphology on relaxation and transport properties of PLA nanocomposites

Article dans une revue avec comité de lecture
Author
LIZUNDIA, Erlantz
GUINAULT, Alain
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
VILAS, Jose Luis
DOMENEK, Sandra
419361 Université Paris-Saclay
549820 Ingénierie, Procédés, Aliments [GENIAL]

URI
http://hdl.handle.net/10985/14635
DOI
10.1016/j.polymertesting.2019.02.009
Date
2019
Journal
Polymer Testing

Abstract

In this work we study the effect of zinc oxide (ZnO) nanoparticle morphology and concentration on the resulting relaxation and transport properties of polylactide (PLA) nanocomposites. Films containing spherical and rod-shaped ZnO nanoparticles were incorporated into an amorphous polylactide (PLA) matrix through a solvent-precipitation and compression moulding method. Morphological analyses carried out by scanning electron microscopy (SEM) together with ultraviolet–visible (UV-Vis) spectroscopy and thermogravimetric analysis (TGA). Results indicate a much better distribution of rod-shaped ZnO within PLA matrix. Relaxation experiments reveal faster physical aging kinetics of PLA in presence ZnO nanoparticles notwithstanding their shape, suggesting the presence of non-interacting surfaces between the amorphous PLA matrix and the ZnO nanoparticles. Interestingly, both helium and oxygen permeability remained stable or increase upon nanoparticle addition, and anisole sorption kinetics showed faster mass transport in the nanocomposites, suggesting that the low interfacial adhesion between PLA and ZnO brings supplementary voids to the material increasing mass transport. Overall, the experimental findings here reported provide a deeper understanding on the influence of metal oxide nanoparticle morphology on the resulting relaxation and gas transport properties of amorphous polymeric nanocomposites.

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