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Biodegradable nanocomposite blown films based on poly(lactic acid) containing silver-loaded kaolinite: A route to controlling moisture barrier property and silver ion release with a prediction of extended shelf life of dried longan
Affiliation:1. Polymer Research Laboratory, Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;2. Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;3. Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;4. National Metal and Materials Technology Center, National Science and Technology Development Agency, Pathumthani 12120, Thailand;1. National Engineering Research Center of Engineering Plastics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China;2. University of Chinese Academy of Sciences, 100049, PR China;1. Department of Metallurgical and Materials Engineering Department, Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University, 34469, Maslak, Istanbul, Turkey;2. Center for High Performance Polymer and Composite Systems (CREPEC), Chemical Engineering Department, Polytechnique Montreal, Montreal, Quebec, H3T 1J4, Canada;3. CREPEC, Chemical Engineering Department, McGill University, Montreal, Quebec, H3A 2B2, Canada;1. Polymer Research Laboratory, Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;2. Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;3. Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
Abstract:Novel biodegradable nanocomposite blown films based on compatibilized poly(lactic acid)-poly(butylene adipate-co-terephthalate) blend are fabricated for use as a model package for dried longan. Silver-loaded kaolinite (AgKT) dispersing in the polymer matrix in intercalated-exfoliated fashion functions as an excellent property improver of the blend. The emphasis of this paper is enhancement of film moisture barrier property by inducing polymer crystallization coupled with formation of AgKT tortuous path. Additionally, controlled silver release which provides long-term antibacterial activity is attributed to AgKT's layered structure. The amount of released silver ions herein also complies with migration levels specified by the standard for food-contact plastic packages. Dried longan shelf lives as eventually predicted by experimental moisture sorption isotherm and by Peleg model are almost identical (∼308 days) for the nanocomposite films being over two folds of that obtained from the compatibilized blend package at ambient condition.
Keywords:Polymer-clay nanocomposite  Barrier properties  Shelf life prediction
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