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Permeability of silicone polymers to hydrogen
Author(s) -
Bhide B. D.,
Stern S. A.
Publication year - 1991
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.1991.070420904
Subject(s) - polymer , permeation , permeability (electromagnetism) , silicone , membrane , polymer chemistry , materials science , side chain , activation energy , hydrogen bond , chemistry , organic chemistry , composite material , molecule , biochemistry
Permeability coefficients, P̄ , for H 2 in 10 different types of silicone polymer membranes were measured in the temperature range of 10.0–55.0°C and at pressures up to 100 psig (∼6.8 atm). The values of P̄ decrease slightly with increasing Δ p , the pressure difference across the membranes. The permeability of silicone polymers to H 2 increases with an increase in temperature; the values of the energy of activation for permeation are in the range of 1.4–4.3 kcal/mol. The substitution of different functional groups in the backbone and side chains of silicone polymers has similar effects on the permeability of the polymers to H 2 as observed in earlier studies with other light gases. P̄ for H 2 decreases with an increase in the bulkiness of the substituted functional groups. The substitution of SiO bonds with stiffer SiC bonds in the backbone chains also results in a considerable decrease in permeability.