6533b7d9fe1ef96bd126d4fe

RESEARCH PRODUCT

Investigations of polymerizable multilayers as gas separation membranes

subject

description

Abstract Polymerizable Langmuir—Blodgett (LB) multilayers of several diacetylenic amphiphiles were investigated on gas-permeable, polymeric supports. Macroscopically homogeneous multilayer films of hexacosa-10,12-diynoic acid and pentacosa-10,12-diyne phosphonate could be built up on polypropylene and polytetrafluoroethylene materials. As shown by scanning electron microscopy, the microscopic homogeneity of the built-up multilayers was mainly controlled by the surface structure of the support material, whereas the chemical nature of the support and photopolymerization of the layers did not affect the high order of the films. Such LB multilayers deposited on porous support materials are able to reduce CH4 flow markedly when compared to uncoated materials. As monomeric and polymerized multilayers show the same gas permeability, the necessary stabilization of the multilayers by polymerization can be achieved without loss of quality of the coating. Thus, polymerizable LB composite membranes may be well suited for gas separation.