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Gas permeability of deformed polyethylene films
Author(s) -
Yasuda H.,
Peterlin A.
Publication year - 1974
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.1974.070180218
Subject(s) - tortuosity , sorption , thermal diffusivity , materials science , permeability (electromagnetism) , polyethylene , composite material , volume fraction , porosity , drop (telecommunication) , volume (thermodynamics) , thermodynamics , chemistry , adsorption , organic chemistry , biochemistry , telecommunications , physics , membrane , computer science
Low‐density polyethylene films strained up to 35% exhibit an initial increase of diffusivity and permeability which soon reach a maximum and subsequently drop to steadily decreasing values below those of the unstrained starting material. The sorption steadily increases and seems to approach a plateau. The maximum and the subsequent decrease are probably caused by significant, recoverable plastic deformation which seems to depress the tortuosity factor but not the free volume, as one concludes from the opposite trend of diffusion and sorption. Permanently deformed drawn or rolled films on the strain range from 0.5 through 3.0 exhibit a continuous decrease of diffusivity and permeability with an almost constant reduction of sorption. This postulates a decrease in free volume and a steadily decreasing tortuosity factor as a consequence of the gradually increasing fraction of the new, practically impermeable fibrous structure.