H. Kumazawa et al., PERMEATION OF CARBON-DIOXIDE IN GLASSY POLY(ETHER IMIDE) AND POLY(ETHER ETHER KETONE) MEMBRANES, Journal of membrane science, 93(1), 1994, pp. 53-59
Sorption equilibria and permeation rates for CO2, O2 and N2 in poly(et
her imide) (PEI) membrane which has a glass-transition temperature of
216-degrees-C and in poly(ether ether ketone) (PEEK) (a typical crysta
lline polymer, crystallinity=0.4) membrane, whose glass-transition tem
perature is 143-degrees-C, were measured at 25, 30 and 40-degrees-C an
d at pressures up to 3 MPa. The pressure dependence of the mean permea
bility coefficients of PEEK membrane to 02 and CO2 obeyed the conventi
onal dual-mode mobility model, whereas that of PEI membrane to CO2 did
not follow the conventional dual-mode mobility model. A modified dual
-mode mobility model which takes into account four kinds of diffusive
movements was satisfactorily used to simulate the pressure dependence.