Sorption and Transport of Gases in Miscible Poly(Methyl Acrylate)/ Poly(Epichlorohydrin) Blends,
TEXAS UNIV AT AUSTIN
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The sorption and the transport of He, Ar, N2, CH4, and CO2 in miscible polymethyl acrylatePMApolyepichlorohydrinPECH blends from 1 to 20 atm at 35 C are reported. For He, Ar, N2, and CH4, the permeabilities and the diffusion times 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 CO2 increases with upstream pressure but solubility follows a simple Henrys 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.
- Physical Chemistry