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Diffusion of saturated hydrocarbons in low density polyethylene (LDPE) films
Author(s) -
Asfour AbdulFattah A.,
Saleem M.,
Kee D. De,
Harrison B. H.
Publication year - 1989
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1989.070380808
Subject(s) - penetrant (biochemical) , low density polyethylene , heptane , decane , polyethylene , octane , materials science , desorption , thermodynamics , hydrocarbon , volume (thermodynamics) , diffusion , analytical chemistry (journal) , chemistry , polymer chemistry , organic chemistry , composite material , physics , adsorption
The diffusion coefficients at zero penetrant concentration, D 0 , of n ‐heptane, n ‐heptane, n ‐octane, n ‐decane, and 2,2,4‐trimethylpentane (TMP) in LDPE were obtained in the range of 25–50°C, using the desorption method. The dependence of D 0 on the size and shape of the penetrant is reported. It was found that D 0 decreases with increasing penetrant molecule size. The activation energies of diffusion in the temperature range of 25–50°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.