S. Chin et al., STEADY-STATE PERMEATION OF CARBON-DIOXIDE THROUGH A MISCIBLE, GLASSY POLYMER BLEND, Journal of polymer science. Part B, Polymer physics, 34(16), 1996, pp. 2689-2699
Steady-state permeation measurements are reported for carbon dioxide (
CO2) through quenched, amorphous films of a miscible blend of poly(but
ylene terephthalate) (PBT) and a random copolyester of bisphenol-A and
iso/terephthalate acids (PAr). Permeabilities were determined at 35 d
egrees C on blends with up to 60 wt % PBT and for CO2 pressures up to
300 psi (2.06 MPa). At a fixed blend composition, the permeability, (P
) over bar, decays with driving pressure, p, as described by dual-mode
models for gas transport in glassy polymers. From regression fits of
the data to dual-mode model predictions for (P) over bar(p), high- and
low-pressure limiting permeabilities are determined. These decrease w
ith PBT content in a manner indicating strong, favorable energetic int
eractions between the PBT and PAr components in the blend. (C) 1996 Jo
hn Wiley & Sons, Inc.