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Durability of poly(dimethylsiloxane) when exposed to chlorine gas
Author(s) -
Eikeland M. S.,
Hägg M.B.,
Brook M. A.,
OttØy M.,
Lindbråthen A.
Publication year - 2002
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.10878
Subject(s) - permeation , membrane , chlorine , gas separation , polymer chemistry , materials science , chemical engineering , polymer , permeability (electromagnetism) , durability , chemistry , composite material , organic chemistry , biochemistry , engineering
Highly crosslinked poly(dimethylsiloxane) (PDMS) is discussed as an alternative membrane material for the gas separation of highly concentrated chlorine gas (90–95 vol %) and oxygen, due to an initial high permeation for Cl 2 and a high selectivity of Cl 2 /O 2 . It was found that the separation properties of the PDMS membrane change over time upon exposure to aggressive chlorine gas; the flux will go down, and the material may even degrade if not appropriately prepared and protected. The PDMS was exposed to chlorine gas over 4 weeks in a glass chamber at both 30 and 60°C and analysed by (FTIR). The membranes were exposed to chlorine gas in a permeation cell with measurements of the permeability of N 2 , O 2 , and Cl 2 at regular intervals. The temperature range for the permeation measurements was 30–100°C, and the pressure difference over the membrane was ca. 2 bar. The time of exposure in the permeation cell was several weeks. The absorption of N 2 , O 2 , and Cl 2 in the PDMS at temperatures in the same range was also measured. This article discusses the durability of the highly crosslinked PDMS membrane following chlorine exposure. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 2458–2470, 2002