HIGHLY OXYGEN PERMSELECTIVE MEMBRANE OF COBALT-COMPLEXED POLYAZOMETHINE CONTAINING TRIDENTATE LIGAND AND OLIGOSILOXANE IN THE REPEATING PAIRS OF THE MAIN-CHAIN
T. Aoki et al., HIGHLY OXYGEN PERMSELECTIVE MEMBRANE OF COBALT-COMPLEXED POLYAZOMETHINE CONTAINING TRIDENTATE LIGAND AND OLIGOSILOXANE IN THE REPEATING PAIRS OF THE MAIN-CHAIN, Polymer Journal, 28(2), 1996, pp. 106-112
Four new polyazomethines containing a tridentate ligand and different
length of oligosiloxane in the repeating pairs were synthesized and co
balt(II) salt was added to the polymer to yield a cobalt(II)-complexed
membrane. Oxygen permselectivities of the cobalt(II)-complexed membra
nes at one atm pressure difference were excellent: oxygen permeability
coefficient (P-O2) = 1.1 - 2.9 x 10(-8)cm(3)(STP). cm . cm(-2). s(-1)
. cmHg(-1), oxygen separation factor (alpha = P-O2/P-N2) = 3.4 - 4.0,
which were very close to those on the upper boundary line reported in
the literature [L. M. Robeson, J. Membrane Sci., 62, 165 (1991)]. Sinc
e P-O2 increased with decrease in the upstream pressure and P-N2 was i
ndependent, a cobalt(II)-complex in the membrane is shown to function
as a fixed oxygen carrier.