Anion exchanging polyimides - contg quaternary ammonium groups for ion exchange membranes in electrodialysis

摘要

Polymers or copolymers are of formula (where R = an organic gp; Ar = an aromatic grp; R'R" and R"' are aliphatic or araliphatic gps; X circled negative an anion; x = 1-4; n = an aliphatic, alcyclic or homo-or hetero-cyclic-aromatic gp. The polymers may be used in high electric fields in electrodialysis.