Abstract
Polymeric membranes exhibit an inverse relation between O 2/N 2 selectivity and O 2 permeability. O 2 carriers can be used to cross this selectivity barrier. O 2/N 2 selectivity was increased by incorporating oxygen-binding cobalt complexes into glassy polymers. The O 2 carriers have been incorporated both by blending with the polymer and by attaching to the polymeric backbone as pendent groups. Polymers with O 2 carriers as pendent groups showed better O 2/N 2 selectivities. The improved selectivity results from facilitation of O 2 and inhibition of N 2 transport. Oxygen selectivity increases with increasing content of the cobalt complex and decreasing O 2 partial pressure. The O 2 transport in these polymers has been interpreted using the dual-mode model. O 2 bound to carrier site diffuses slowly but has very high solubility coefficient. These membranes have a life time problem. O 2 selectivity decreases with increasing O 2 exposure time. More stable O 2 carriers are required to make these membranes commercially viable.
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