Study of barrier properties and chemical resistance of recycled PET coated with amorphous carbon through a plasma enhanced chemical vapour deposition (PECVD) process
Authors: Cruz, S. A.1; Zanin, M.1; Nerin, C.2; De Moraes, M. A. B.3
Source: Food Additives and Contaminants, Volume 23, Number 1, Number 1/January 2006 , pp. 100-106(7)
Publisher: Taylor and Francis Ltd
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Abstract:
Many studies have been carried out in order to make bottle-to-bottle recycling feasible. The problem is that residual contaminants in recycled plastic intended for food packaging could be a risk to public health. One option is to use a layer of virgin material, named functional barrier, which prevents the contaminants migration process. This paper shows the feasibility of using polyethylene terephthalate (PET) recycled for food packaging employing a functional barrier made from hydrogen amorphous carbon film deposited by Plasma Enhanced Chemical Vapour Deposition (PECVD) process. PET samples were deliberately contaminated with a series of surrogates using a FDA protocol. After that, PET samples were coated with approximately 600 and 1200 Angstrons thickness of amorphous carbon film. Then, the migration tests using as food simulants: water, 10% ethanol, 3% acetic acid, and isooctane were applied to the sample in order to check the chemical resistance of the new coated material. After the tests, the liquid extracts were analysed using a solid-phase microextraction device (SPME) coupled to GC-MS.Keywords: PET; recycling; food packaging; migration; plasma; CG-MS; functional barrier
Document Type: Research article
DOI: 10.1080/02652030500384064
Affiliations: 1: Department of Materials Engineering/Universidade Federal de São Carlos, São Carlos, Brasil 2: Department of Analytical Chemistry, University of Zaragoza, Zaragoza, Spain 3: Physics Institute/ Universidade Estadual de Campinas, Cidade Universitaria Zeferino Vaz, Brasil
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