Collect. Czech. Chem. Commun. 1993, 58, 252-258

Determination of Diffusion Coefficient of Carbon Dioxide in Polyethylene by the Method of Moments

Jan Jirásek and Milan Šípek

Department of Physical Chemistry, Prague Institute of Chemical Technology, 166 28 Prague 6, Czech Republic


By using the method of moments, the values of diffusion coefficients of carbon dioxide in high-pressure polyethylene of two different thicknesses were determined at 25 °C. The values of diffusion coefficients determined with the accuracy of about ±3% are in good agreement both with the values obtained by the optimization method, and with the published values determined on the basis of asymptotic solutions of diffusion equations.