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Dilation of substituted polycarbonates caused by high-pressure carbon dioxide sorption

✍ Scribed by G. K. Fleming; W. J. Koros

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
867 KB
Volume
28
Category
Article
ISSN
0887-6266

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✦ Synopsis

Abstract

Mass sorption/desorption and volume dilation/consolidation measurements are reported for tetramethyl and hexafluoro polycarbonate samples in the presence of carbon dioxide pressures up to 900 psia at 35°C. These results are combined with previous results for bisphenol‐A‐polycarbonate. The combined sorption and volume dilation measurements are used to analyze the thermodynamics of the three gas‐polymer systems, and the partial specific volumes of carbon dioxide and the polymer are reported as functions of sorption level. Desorption and subsequent resorption measurements with the substituted polycarbonates show large and long‐lived hysteretic effects similar to those seen with standard bisphenol‐A‐polycarbonate. Finally, assumptions inherent in the dual‐mode model are shown to provide a satisfactory description of the volume dilation behavior for the substituted polymers.

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