Collect. Czech. Chem. Commun. 1994, 59, 2000-2004

DieneN-(2,4,6-Tribromophenyl)maleimide Copolymer Membranes for Pervaporation of Ethanol-Water Mixtures

Jan Lokaj, Miroslav Bleha and Jana Kovářová

Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 162 06 Prague 6, Czech Republic


Alternating copolymers of butadiene or isoprene with N-(2,4,6-tribromophenyl)maleimide and the copolymer of chloroprene containing 42.7 mole % N-(2,4,6-tribromophenyl)maleimide structure units were synthesized by radical copolymerization. Along with copolymerization, the Diels-Alder addition of comonomers proceeded. DSC revealed some crosslinking of the copolymers occurring even at room temperature. Homogeneous membranes were prepared from the copolymers by solution casting and tested in pervaporation of variously concentrated aqueous ethanol. Separation factors of the membranes related to the preferentially transported water increased with increasing content of ethanol in solutions to be separated. In contrast to hydrophilic maleimide groups, the incorporated diene units lowered separation efficiency due to their affinity to ethanol.