RT Journal Article
T1 Diffusional characteristics of coextruded linear low-density polyethylenes prepared from different conditions of processing
A1 García Villaluenga, Juan Pedro
A1 Seoane Rodríguez, Benjamín
A1 Compañ, V.
AB The permeability and diffusivity of oxygen, carbon dioxide, nitrogen, and helium have been obtained for a range of linear low density polyethylene (LLDPE) films prepared from the same raw materials but with different processing conditions. The measurements were carried out by means of a permeation technique over the temperature interval where the alpha-relaxation processes were observed in earlier studies. The temperature dependence of the permeability and diffusion coefficients of gases shows 2 well-differentiated regions in all films. The break temperature of these regions is approximately located at the same temperature as the alpha-relaxation takes place. Both the permeability and their temperature dependence do not show a noticeable influence on the processing conditions. The effect of processing conditions on the diffusivity seems to be more complex. Differences are observed for different films in the diffusion coefficients, in the case of oxygen, and in their change with the temperature, which is particularly marked in the case of carbon dioxide. Fujita's free volume model has been applied to diffusivity data in order to study the influence of films microstructure in gas permeation properties through them.
SN 0021-8995
YR 1998
FD 1998-10-03
LK https://hdl.handle.net/20.500.14352/58982
UL https://hdl.handle.net/20.500.14352/58982
LA eng
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NO © 1998 John Wiley & Sons, Inc. Contract grant sponsors: DGICYT and Fundación Caixa-Castelló; contract grant numbers: PB95-0134-C02 and P1B95-04, respectively.
NO DGICYT
NO Fundación Caixa- Castelló
DS Docta Complutense
RD 29 abr 2024