Structure, gas-barrier properties and overall migration of poly(lactic acid) films coated with hydrogenated amorphous carbon layers

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Title: Structure, gas-barrier properties and overall migration of poly(lactic acid) films coated with hydrogenated amorphous carbon layers
Authors: Mattioli, Samantha | Peltzer, Mercedes Ana | Fortunati, Elena | Armentano, Ilaria | Jiménez, Alfonso | Kenny, José María
Research Group/s: Análisis de Polímeros y Nanomateriales
Center, Department or Service: Universidad de Alicante. Departamento de Química Analítica, Nutrición y Bromatología
Keywords: Hydrogenated amorphous carbon | Poly(lactic acid) films | Food packaging
Knowledge Area: Química Analítica
Issue Date: Nov-2013
Publisher: Elsevier
Citation: Carbon. 2013, 63: 274-282. doi:10.1016/j.carbon.2013.06.080
Abstract: Hydrogenated amorphous carbon (a-C:H) films were grown on a poly(lactic acid) (PLA) substrate by means of a radiofrequency plasma-enhanced chemical vapour deposition (rf-PECVD) technique with different deposition times (5, 20 and 40 min). The main goal of this treatment was to increase the barrier properties of PLA, maintaining its original transparency and colour as well as controlling interactions with food simulants for packaging applications. Morphological, chemical, and mechanical properties of PLA/a-C:H systems were evaluated while permeability and overall migration tests were performed in order to determine the effect of the plasma treatment on the gas-barrier properties of PLA films and their application in food packaging. Morphological results suggested a good adhesion of the deposited layers onto the polymer surface and the samples treated for 5 and 20 min only slightly darkened the PLA film. X-ray photoelectron spectroscopy revealed that the structural properties of the carbon layer deposited onto the PLA film depend on the exposure time. PLA/a-C:H system treated for 5 min showed the highest barrier properties, while none of the studied samples exceeded the migration limit established by the current legislation, suggesting the suitability of these materials in packaging applications.
Sponsor: Authors gratefully acknowledge the financial support from the National Consortium of Materials Science and Technology (INSTM) and Spanish Ministry of Economy and Competiveness (MAT2011-28648-C02-01).
ISSN: 0008-6223 (Print) | 1873-3891 (Online)
DOI: 10.1016/j.carbon.2013.06.080
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
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Appears in Collections:INV - NANOBIOPOL - Artículos de Revistas

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