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Diffusion of saturated hydrocarbons in low density polyethylene (LDPE) films

✍ Scribed by Abdul-Fattah A. Asfour; M. Saleem; D. De Kee; B. H. Harrison

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
624 KB
Volume
38
Category
Article
ISSN
0021-8995

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✦ Synopsis

Synopsis

The diffusion coefficients at zero penetrant concentration, Do, of n-hexane, n-heptane, noctane, n-decane, and 2,2,4-trimethylpentane (TMP) in LDPE were obtained in the range of 25-50Β°C, using the desorption method. The dependence of D, on the size and shape of the penetrant is reported. I t was found that Do decreases with increasing penetrant molecule size. The activation energies of diffusion in the temperature range of 25-50Β°C increase with increasing penetrant molecule size and are independent of temperature. The results are interpreted in terms of the free volume theory and semiquantitative estimates of the free volume parameters are reported.

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