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Open AccessArticle

The Performance Changes and Migration Behavior of PLA/Nano-TiO2 Composite Film by High-Pressure Treatment in Ethanol Solution

1
Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650550, China
2
School of Energy and Environment Science, Yunnan Normal University, Kunming 650550, China
3
Institute of Agriculture and Food Engineering, Kunming University of Science and Technology, Kunming 650550, China
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(2), 471; https://doi.org/10.3390/polym12020471
Received: 17 January 2020 / Revised: 13 February 2020 / Accepted: 15 February 2020 / Published: 18 February 2020
(This article belongs to the Special Issue Advanced biodegradable Polymers and composites for Food Packaging)
To study the relationship between performance changes and nanoparticles migration of the composite film at different migration stages, the poly (lactic acid) (PLA)/nano-TiO2 composite film treated by high pressure was immersed in 50% (v/v) ethanol solution for 45 days at 40 °C, and the film characteristics and migration behavior were analyzed. The results showed that the migration of the composite film with the highest loading of nano-TiO2 (20 wt. %) in alcoholic food simulated solution was far less than 10 mg/kg during the 45-day migration process. Although with the increase of migration time, the micro-morphology of composite film became rougher, the crystallinity decreased and the gas permeability increased, but the internal crystal structure of the composite film remained basically unchanged. The PLA/nano-TiO2 composite films treated by high pressure treatment were relatively stable, and had good performance and migration behavior in alcoholic food simulated solution, the nanocomposite film after high pressure treatment could be used to reduce nano-TiO2 particle migration and subsequently reduce human exposure as the packaging film for the packaging of alcoholic food, which provide a theoretical basis for the applications of high pressure treatment of PLA/nano-TiO2 composite films in food packaging material and broaden its application prospects. View Full-Text
Keywords: poly (lactic acid); nano-TiO2; high pressure treatment; migration poly (lactic acid); nano-TiO2; high pressure treatment; migration
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MDPI and ACS Style

Tang, Z.; Fan, F.; Fan, C.; Jiang, K.; Qin, Y. The Performance Changes and Migration Behavior of PLA/Nano-TiO2 Composite Film by High-Pressure Treatment in Ethanol Solution. Polymers 2020, 12, 471.

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