Journal
POLYMERS
Volume 12, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/polym12071611
Keywords
montmorillonite; intercalation reaction; starch film; barrier mechanism
Categories
Funding
- Basic Ability Improvement Project of Young and Middle-Aged Teachers in Guangxi Colleges and Universities, 2020 [2020KY01012]
- Nanning Scientific Research and Technological Development Plan Project [20195215]
- Guangxi Key Laboratory of Clean Pulp Papermaking and Pollution Control [ZR201806-6]
- Guangxi Science and Technology Project (Guangxi Science) [AB18221126]
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In this study, we investigated the barrier properties of a montmorillonite-reinforced biomass material, starch. Organically modified montmorillonite materials were prepared from natural montmorillonite by reacting it with dodecyl trimethyl ammonium chloride, dodecyl dimethyl benzyl ammonium chloride or octadecyl trimethyl ammonium chloride under ultrasonic conditions. The composite starch films incorporated with these organically modified montmorillonite samples were characterized by scanning electron microscopy, transmission electron microscopy, infrared spectroscopy and X-ray diffraction. The results showed that the introduction of montmorillonite decreases the transmittance of the composite film by 10% in the visible region and significantly inhibits UV-light transmittance. The decomposition temperature of the composite film ranges from 200 to 500 degrees C, with a weight loss rate of 80%. The distance between the montmorillonite layers increases from 0.14 nm in the non-magnetized state to 1.49 nm after magnetization. The oxygen permeability of the starch film modified by organic montmorillonite (0.067 cm(3)/m(2)center dot d) is lower than that of the montmorillonite starch film without magnetization (0.097cm(3)/m(2)center dot d). The oxygen barrier capacity is close to zero. Particularly in the ordered magnetic montmorillonite starch composite film, the oxygen barrier ability is the best. Therefore, modified montmorillonite could serve as an excellent reinforcing agent for cassava starch films and effectively improve the oxygen barrier performance of the films.
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