Sorption and transport of gases in miscible poly(methyl acrylate)/poly(epichlorohydrin) blends

✍ Scribed by J. S. Chiou; J. W. Barlow; D. R. Paul

• Publisher: John Wiley and Sons
• Year: 1985
• Tongue: English
• Weight: 716 KB
• Volume: 30
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1985.070300322

✦ Synopsis

The sorption and the transport of He, Ar, N,, CH,, and COP in miscible poly(methy1 acry-lateXPMA)/poly(epichlorohydrinKPECH) blends from 1 to 20 atm at 350C are reported. For He, Ar, N2, and CH,, the permeabilities and the diffusion time lags are independent of the upstream pressure, if the compaction effect resulting from compression of the polymer membrane onto the supporting medium is eliminated. The permeability of C02 increases with upstream pressure but solubility follows a simple Henry's law behavior. For all five gases, the dependence of solubility, diffusion coefficient, and permeability on blend composition are compared with theoretical mixing rules with the conclusion that both the interaction energy density and the excess activation energy for gas diffusion in the blends are near zero. The fact that the specific volumes of the blends exactly follow linear additivity also confirms that only very weak interactions exist between PMA and PECH.