Permeation of vapors through polymers at low temperature and elevated pressures | Zendy

Henley Ernest J. | Zendy; Santos Marcos Luiz Dos | Zendy

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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

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.

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