Mass transfer of a penetrant plasticizer/simple gas mixture in a block copolymer

Mass transfer of a penetrant plasticizer/simple gas mixture in block copoly mers with a flexible fragment and rigid fragment, the latter containing act ive groups that enter into donor-acceptor relation with the penetrant plast icizer, was investigated for the case of the systems comprising a mixture o f SO2-N-2/polyether (polyester) urethanes or polyether (polyester) urethane urea, polyarylate siloxanes having a block structure. Permeation of SO2 an d N-2 in the block copolymers has been found to proceed through various fra gments of polymer macromolecules. (C) 2000 Elsevier Science B.V. All rights reserved.