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Typical diffusion behaviour in packaging polymers - Application to functional barriers

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Author: Dole, P. · Feigenbaum, A.E. · Cruz, C. de la · Pastorelli, S. · Paseiro, P. · Hankemeier, T. · Voulzatis, Y. · Aucejo, S. · Saillard, P. · Papaspyrides, C.
Type:article
Date:2006
Institution: TNO Kwaliteit van Leven
Source:Food Additives and Contaminants, 2, 23, 202-211
Identifier: 239119
doi: doi:10.1080/02652030500373661
Keywords: Packaging · Analytical research · Packaging · Activation energy · Diffusion coefficient · Functional barrier · Migration · Packaging · Polymer · Recycling · Surrogates · ethylene vinyl acetate copolymer · ethylene vinyl alcohol copolymer · glass · plastic · polyacrylonitrile · polyamide · polyethylene terephthalate · polymer · polyolefin · polystyrene · polyvinylchloride · rubber · vinylidene chloride · article · controlled study · diffusion · diffusion coefficient · energy · food contamination · food packaging · molecular weight · prediction · priority journal · recycling · reference value · temperature · Acrylic Resins · Conservation of Natural Resources · Food Contamination · Food Packaging · Molecular Weight · Nylons · Plastics · Polyenes · Polyethylene Terephthalates · Polymers · Polystyrenes · Polyvinyl Chloride · Polyvinyls · Reference Values

Abstract

When plastics are collected for recycling, possibly contaminated articles might be recycled into food packaging, and thus the contaminants might subsequently migrate into the food. Multilayer functional barriers may be used to delay and to reduce such migration. The contribution of the work reported here is to establish reference values (at 40°C) of diffusion coefficients and of activation energies to predict the functional barrier efficiency of a broad range of polymers (polyolefins, polystyrene, polyamide, PVC, PET, PVDC, [ethylene vinyl alcohol copolymer], polyacrylonitrile and [ethylene vinyl acetate copolymer]). Diffusion coefficients (D) and activation energies (Ea) were measured and were compiled together with literature data. This allowed identification of new trends for the log D=f(molecular weight) relationships. The slopes were a function of the barrier efficiency of the polymer and temperature. The apparent activation energy of diffusion displayed two domains of variation with molecular weight (M). For low M (gases), there was little variation of Ea. Focusing on larger molecules, high barrier polymers displayed a larger dependence of Ea with M. The apparent activation energy decreased with T. These results suggest a discontinuity between rubbery and glassy polymers. © 2006 Taylor & Francis. Chemicals / CAS: ethylene vinyl acetate copolymer, 24937-78-8; ethylene vinyl alcohol copolymer, 25067-34-9; polyacrylonitrile, 25014-41-9, 63231-45-8; polyamide, 63428-83-1; polyethylene terephthalate, 25038-59-9, 9003-68-3; polystyrene, 9003-53-6; polyvinylchloride, 9002-86-2; rubber, 9006-04-6; vinylidene chloride, 25323-30-2, 75-35-4; Acrylic Resins; ethylene-vinyl alcohol copolymer, 25067-34-9; ethylenevinylacetate copolymer, 24937-78-8; Nylons; PL 732, 83136-87-2; Plastics; polyacrylonitrile, 25014-41-9; Polyenes; Polyethylene Terephthalates; Polymers; Polystyrenes; Polyvinyl Chloride, 9002-86-2; Polyvinyls