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Permeability of silicone polymers to ammonia and hydrogen sulfide
Author(s) -
Stern S. A.,
Bhide B. D.
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.1989.070381114
Subject(s) - polymer , silicone , hydrogen sulfide , permeability (electromagnetism) , polymer chemistry , ammonia , materials science , sulfide , hydrogen bond , nitrogen , chemistry , membrane , organic chemistry , composite material , molecule , sulfur , biochemistry
Permeability coefficients, P̄, for NH 3 AND H 2 S in 11 different types of silicone membranes were measured in the temperature range from 10.0 to 55.0°C and at pressures up to 115 psig (∼ 7.8 atm). The values of P̄ for NH 3 and H 2 S in different silicone polymers decrease considerably as the bulkiness of the functional groups in the side and backbone chains of these polymers increases. the substitution of SiO bonds with stifer SiC bonds in the backbone chains also results in a considerable decrease in gas permeability. the values of P̄ for NH 3 and H 2 S increse exponentially with incresing δ p , the pressure difference across the membrancs. The temperature dependence of NH 3 and H 2 S varies greatly: P̄ can increase, decrease, or pass through a minimum with increasing temperature, depending on the nature of the silicone polymer. The temperature dependence of P̄ is also affected in some cases by Δ p . The permeability behavior of silicone polymers to NH 3 and H 2 S is compared with that to other penetrant gases, and the factors which might affect this behavior are discussed.