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Sorption and diffusion of carbon dioxide in single-phase polystyrene/poly(vinylmethylether) blends

✍ Scribed by A. Mokdad; A. Dubault; L. Monnerie

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
575 KB
Volume
34
Category
Article
ISSN
0887-6266

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✦ Synopsis

The sorption and transport properties of C 0 2 in miscible PS/PVME blends at 20Β°C are reported as a function of pressure from 1 to 15 atm. The complex shape of isotherms for glassy blends and the concentration-dependent diffusion coefficient for rubbery blends reveal a plasticization by sorbed COP. The significant depression in Tg has to be taken into account in the analysis of the sorption data. Diffusion coefficient for CO, passes through a minimum when plotted against the blend composition. Such a behavior can be quantitatively related to the negative volume mixing of the PS/PVME system in the framework of the theories based on unoccupied volume.

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