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

POLYMER

卷:108

Article

Nassar, Samira Fernandes¹  Guinault, Alain²  Delpouve, Nicolas³  Divry, Veronique¹  Ducruet, Violette¹  Sollogoub, Cyrille²  Domenek, Sandra¹ 

[1] Univ Paris Saclay, UMR Ingn Proc Aliments, AgroParisTech, INRA, 1 Ave Olympiades, F-91300 Massy, France

[2] CNAM, CNRS, Arts & Metiers ParisTech, PIMM,UMR 8006, 151 Bd Hop, F-75013 Paris, France

[3] UNIROUEN, Normandie Univ, LECAP, F-76000 Rouen, France

关键词: PLA;    poly(lactic acid);    Crystallization;    Amorphous phase;    Permeability;    Rigid amorphous fraction;    Cooperative rearranging region;    PLA polymorphism;   

DOI  :  10.1016/j.polymer.2016.11.047

来源: Elsevier

【 摘 要 】

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 a-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. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

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