期刊
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
卷 101, 期 12, 页码 4925-4933出版社
WILEY
DOI: 10.1002/jsfa.11136
关键词
poly(lactic acid); nano‐ ZnO; ultrahigh pressure; crystallinity; barrier property
资金
- National Natural Science Foundation of China [32060569, 21576126]
- National Key R & D Program of China [2016YFD0400203]
- National Student Innovation and Entrepreneurship Training Program of China [201810674013]
Ultra-high-pressure treatment significantly improved the crystallinity, strength, and barrier properties of PLA/ZnO nanocomposite films by promoting the interaction between nano-ZnO and the PLA matrix. This technique has great potential in producing food packaging films with ideal functions.
BACKGROUND Our living environment is being increasingly polluted by petroleum-based plastics and there is an increasing demand for biodegradable food packaging. In this study, the effect of various ultrahigh-pressure (UHP) treatments (0, 200 and 400 MPa) on the microstructure and thermal, barrier and mechanical properties of poly(lactic acid) (PLA)/ZnO nanocomposite films was studied. RESULTS The film-forming solution was processed using UHP technology. The crystallinity, strength and stiffness of the composite film after UHP treatment increased. In addition, barrier property analysis showed that the UHP treatment significantly (P < 0.05) reduced the oxygen permeability and water vapor permeability (WVP) coefficient of the PLA/ZnO nanocomposite film. Furthermore, the WVP value of the film treated at 400 MPa (50 g kg(-1) nano-ZnO content) was the lowest and reduced by 47.3% compared with that of pure PLA film. The improvement in these properties might be due to the interaction between nano-ZnO and PLA matrix promoted by UHP treatment. CONCLUSIONS Therefore, the application of UHP technology on the film-forming solution could improve the crystallinity and functional properties of the nanocomposite film, and has great potential in the production of food packaging films with ideal functions. (c) 2021 Society of Chemical Industry
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