Abstract
AbstractDiarylacetylene monomers (1b−f) containing siloxy and either naphthyl, fluorenyl, or biphenyl groups were polymerized with TaCl5–n‐Bu4Sn catalyst, and 1b, 1c, and 1f provided high molecular weight polymers. Free‐standing membranes of polymers 2b, 2c, and 2f were fabricated by casting from toluene solution. Desilylation of these polymer membranes was carried out with trifluoroacetic acid to afford poly (diarylacetylenes) membranes having hydroxy groups (3b and 3c). According to thermogravimetric analysis (TGA), both siloxy‐containing and hydroxy‐containing polymers exhibited high thermal stability, and the onset temperatures of weight loss in air were ∼370 °C and ∼430 °C, respectively. The CO2 permeability coefficients of these membranes were in the range of 65–640 barrers. The points of 3b and 3c in the PCO2 versus PCO2/PCH4 plot were located above Robeson's upper bound. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 4487–4495, 2007
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