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Diffusional characteristics of coextruded linear low-density polyethylenes prepared from different conditions of processing

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García Villaluenga, Juan Pedro and Seoane Rodríguez, Benjamín and Compañ, V. (1998) Diffusional characteristics of coextruded linear low-density polyethylenes prepared from different conditions of processing. Journal of applied polymer science, 70 (1). pp. 23-37. ISSN 0021-8995

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Official URL: http://dx.doi.org/10.1002/(SICI)1097-4628(19981003)70:1<23::AID-APP5>3.0.CO;2-W




Abstract

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.


Item Type:Article
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© 1998 John Wiley & Sons, Inc. Contract grant sponsors: DGICYT and Fundación Caixa-Castelló; contract grant numbers: PB95-0134-C02 and P1B95-04, respectively.

Uncontrolled Keywords:Gas Permeation, LLDPE Films, Diffusion
Subjects:Sciences > Physics > Thermodynamics
ID Code:24971
Deposited On:08 Apr 2014 10:24
Last Modified:05 Nov 2015 16:46

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