Poly(phenylene)-based anion exchange membrane
A poly(phenylene) compound of copolymers that can be prepared with either random or multiblock structures where a first polymer has a repeat unit with a structure of four sequentially connected phenyl rings with a total of 2 pendant phenyl groups and 4 pendant tolyl groups and the second polymer has a repeat unit with a structure of four sequentially connected phenyl rings with a total of 6 pendant phenyl groups. The second polymer has chemical groups attached to some of the pendant phenyl groups selected from CH 3 , CH 2 Br, and CH 2 N(CH 3 ) 3 Br groups. When at least one group is CH 2 N(CH 3 ) 3 Br, the material functions as an anion exchange membrane.
1. A poly(phenylene) material, comprising:
a poly(phenylene) compound represented by the structure
consisting essentially of a first polymer with m repeating units with 7≦m≦20 and a second polymer with n repeating units with 6≦n≦18, said first polymer having a structure with 4 phenyl rings having 6 pendant phenyl groups and said second polymer having a structure with 4 phenyl rings having 2 pendant phenyl groups and 4 pendant tolyl groups, and each R group can be a group selected from R═CH 3 , CH 2 Br, and CH 2 N(CH 3 ) 3 Br.
2. The poly(phenylene) material of claim 1 where at least one R group is CH 2 N(CH 3 ) 3 Br and the material functions as an anionic exchange membrane.
3. The poly(phenylene) material of claim 2 wherein the material has an ion exchange capacity between 0.9 and 1.5 meq/g.
4. The poly(phenylene) material of claim 1 wherein m=n.