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Polymers 2018, 10(9), 1011; https://doi.org/10.3390/polym10091011

High Pressure Treatment for Improving Water Vapour Barrier Properties of Poly(lactic acid)/Ag Nanocomposite Films

1
Institute of Yunnan Food Safety, Kunming University of Science and Technology, Kunming 650550, China
2
State Key Laboratory of Oral Diseases, Sichuan University, Chengdu 610041, China
3
College of Food Sciences and Engineering, South China University of Technology, Guangzhou 510640, China
*
Author to whom correspondence should be addressed.
Received: 7 July 2018 / Revised: 9 August 2018 / Accepted: 7 September 2018 / Published: 11 September 2018
(This article belongs to the Special Issue Polymers for Packaging Applications)
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Abstract

Effects of high pressure treatment (0, 200 and 400 MPa) on water vapour barrier, microstructure, thermal, and mechanical properties of poly (lactic acid) (PLA)/Ag nanocomposite films were investigated. The migration behavior of nano-Ag from the nanocomposite films in the presence of 50% (v/v) ethanol as a food simulant was also studied. The water vapour barrier properties increased as pressure was applied to film-forming solutions. High pressure treatment enhanced the mutual effect between PLA and nanoparticles, leading to a more compact network structure in PLA/Ag nanocomposite films. Furthermore, PLA/Ag nanocomposite films treated by high pressure were significantly affected by microstructure, thermal, and mechanical properties when, compared with untreated samples. High pressure treatment at 200 to 400 MPa significantly (p < 0.05) reduced the migration of nano-Ag from the films. Overall, high pressure treatment on film-forming solutions showed potential in improving the functional properties of nanocomposite films, especially in relation to water vapour barrier properties. View Full-Text
Keywords: poly (lactic acid); nano-Ag; high pressure; water vapour barrier property; migration poly (lactic acid); nano-Ag; high pressure; water vapour barrier property; migration
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Chi, H.; Xue, J.; Zhang, C.; Chen, H.; Li, L.; Qin, Y. High Pressure Treatment for Improving Water Vapour Barrier Properties of Poly(lactic acid)/Ag Nanocomposite Films. Polymers 2018, 10, 1011.

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