Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 139, Issue -, Pages 85-93Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2019.07.151
Keywords
PLA; Nano-TiO2; Migration
Funding
- Open Project Program of State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science & Technology, China [SKLFNS-KF-201815]
- Tianjin Natural Science Foundation, China [18JCYBJC43700]
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The poly(lactic acid) (PLA)/nano-TiO2 composite films with different nano-TiO2 loading (0 wt%, 1 wt%, 5 wt%, 10 wt%, 15 wt%, and 20 wt%) were prepared and contacted with 50% (v/v) ethanol solution as food simulant to study the behavior of nano-TiO2 migration. The structural changes and intermolecular interactions were determined by scanning electron microscopy (SEM), X-ray diffraction (XRD), and differential scanning calorimetry (DSC). The migration amount increased with the increase of initial nano-TiO2 content. SEM images demonstrated that the microstructure of PLA nanocomposite films became rougher as exposure to ethanol solution in a few days. XRD spectra indicated that a decrease in the intensity of specific diffraction peak occurred as the decrease in nano-TiO2 content of PLA nanocomposite films during exposure to ethanol simulant. DSC analysis confirmed that the higher crystallinity percentage obtained during the different degradation times. The reasonable food packaging application of the nano-TiO2 composite films with restrained nano-TiO2 migration could be accomplished by controlling the nano-TiO2 loading. (C) 2019 Elsevier B.V. All rights reserved.
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