Document Detail


Typical diffusion behaviour in packaging polymers - application to functional barriers.
MedLine Citation:
PMID:  16449064     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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 degrees 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.
Authors:
Patrice Dole; Alexandre E Feigenbaum; Carlos De La Cruz; Sara Pastorelli; Perfecto Paseiro; Thomas Hankemeier; Yiannis Voulzatis; Susana Aucejo; Philippe Saillard; Costas Papaspyrides
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Food additives and contaminants     Volume:  23     ISSN:  0265-203X     ISO Abbreviation:  Food Addit Contam     Publication Date:  2006 Feb 
Date Detail:
Created Date:  2006-02-01     Completed Date:  2006-06-26     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8500474     Medline TA:  Food Addit Contam     Country:  England    
Other Details:
Languages:  eng     Pagination:  202-11     Citation Subset:  IM    
Affiliation:
INRA SquAlE, Reims, France.
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MeSH Terms
Descriptor/Qualifier:
Acrylic Resins
Conservation of Natural Resources
Food Contamination*
Food Packaging / methods*
Molecular Weight
Nylons
Plastics
Polyenes
Polyethylene Terephthalates
Polymers / chemistry*
Polystyrenes
Polyvinyl Chloride
Polyvinyls
Reference Values
Chemical
Reg. No./Substance:
0/Acrylic Resins; 0/Nylons; 0/Plastics; 0/Polyenes; 0/Polyethylene Terephthalates; 0/Polymers; 0/Polystyrenes; 0/Polyvinyls; 24937-78-8/ethylenevinylacetate copolymer; 25014-41-9/polyacrylonitrile; 25067-34-9/ethylene-vinyl alcohol copolymer; 83136-87-2/PL 732; 9002-86-2/Polyvinyl Chloride

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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