Modified styrene‐isoprene‐styrene block copolymer membranes complexed with cobalt‐containing schiff's bases for oxygen permeation

The grafting of 4‐vinylpyridine (VP) and 1‐vinylimidazole (VIm) onto styrene‐isoprene‐styrene (SIS) triblock copolymer by radiation‐induced graft copolymerization was studied. The effect of grafting degree on gas permeability of membranes made of grafted copolymers was investigated. The complex formation of the modified SIS (SIS‐g‐VP or SIS‐g‐VIm) with cobalt‐containing Schiff's bases (CoS) in chloroform solution was studied. Facilitated transport of molecular oxygen in modified SIS membranes containing CoS as fixed carrier of oxygen, and oxygen permeability in modified SIS membranes due to the oxygen binding ability to CoS was observed. Mechanism of oxygen transport across the SIS‐g‐VP‐CoS and SIS‐g‐VIm‐CoS membrane is discussed.