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Permeation of vapors through polymers at low temperature and elevated pressures
Author(s) -
Henley Ernest J.,
Santos Marcos Luiz Dos
Publication year - 1967
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690130615
Subject(s) - endothermic process , permeation , exothermic reaction , propane , atmospheric temperature range , polyethylene , polymer , intermolecular force , chemistry , thermodynamics , activation energy , ethylene , polymer chemistry , chemical engineering , materials science , adsorption , organic chemistry , membrane , molecule , catalysis , biochemistry , physics , engineering
Abstract The permeation of propane, propylene, ethane, and ethylene through 0.0051‐cm. thick polyethylene films was measured at temperatures between 25° and −30°C. Plots of P vs. 1/ T for C 3 H 8 , C 3 H 6 , and C 2 H 6 were saucer shaped, the activation energies changing from positive (endothermic) to negative (exothermic) over a narrow temperature range. This change is attributed to a plasticization‐condensation phenomenon and a change in intermolecular potentials.