Thermal oxidative stability and effect of water on gas transport and mechanical properties in PA6-EVOH films (Articolo in rivista)

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  • Thermal oxidative stability and effect of water on gas transport and mechanical properties in PA6-EVOH films (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1002/polb.21095 (literal)
Alternative label
  • P. Cerruti, P. Laurienzo, M. Malinconico, C. Carfagna (2007)
    Thermal oxidative stability and effect of water on gas transport and mechanical properties in PA6-EVOH films
    in Journal of polymer science. Part B, Polymer physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • P. Cerruti, P. Laurienzo, M. Malinconico, C. Carfagna (literal)
Pagina inizio
  • 840 (literal)
Pagina fine
  • 849 (literal)
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  • 45 (literal)
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  • No. Citazione=0; Autocitazione=0; Motore utilizzato per le citazioni=Google Scholar. (literal)
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  • 7 (literal)
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  • ISI Web of Science (WOS) (literal)
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  • CNR (literal)
Titolo
  • Thermal oxidative stability and effect of water on gas transport and mechanical properties in PA6-EVOH films (literal)
Abstract
  • The thermal oxidative stability and the effect of water on gas transport and mech. properties of blends of polyamide 6 (PA6) with ethylene-co-vinyl alc. (EVOH) and EVOH modified with carboxyl groups (EVOH-COOH) have been investigated. The presence of EVOH reduces water vapor and oxygen gas permeability of polyamide, as well as small amts. of EVOH-COOH further improve barrier properties, esp. to oxygen. This has been explained in terms of improved interactions of the blend constituents in the amorphous phase, due to ionic linkages between the polyamide amino groups and the carboxyls of modified EVOH. The permeation to gases was found to increase with the amt. of sorbed water. The morphol. of the samples was found to have an effect on barrier properties, as the presence of EVOH causes the PA6 a cryst. form to increase, lowering the permeability to oxygen and water vapor. Mech. properties are strongly affected by water sorption, as tensile modulus and strength decrease with increasing water content. Chemiluminescence (CL), IR spectroscopy (FTIR), and tensile test were employed in order to assess the correlation between chem. compn. and the thermal oxidative stability of the films aged at 110 in air. CL expts. suggest that the presence of EVOH and EVOH-COOH efficiently inhibits the formation of peroxidized species during the processing, and increases the thermal oxidative stability of the films. IR spectroscopy showed a build-up of carbonyl absorption in the range 1700-1780 cm-1, due to the formation of oxidn. products, which is greater in the case of the pure polymer. Tensile tests on films revealed a redn. in ductility as a result of ageing for neat PA6, whereas in comparison the blends exhibit a far better long-term stability. (literal)
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