| abstract |
A polymer comprising at least one unit of the formula (1) wherein T 1 is a carbon atom or a nitrogen atom, T 2 is a carbon atom if T 1 is a nitrogen atom, or is a nitrogen atom if T 1 is a carbon atom,r is 1, 2, 3 or 4, s is 1, 2, 3, or 4, M 1 is preferably selected from the group consisting of M 2 is preferably The polymers are prepared by reacting monomers (1a) with monomers (2a) H 2 N-[-M 1 -]r -NH 2 (1a) OHC-[-M 2 -]s -CHO (2a) or the step of reacting monomers (1b) with monomers (2b) OHC-[-M 1 -]r -CHO (1b) H 2 N-[-M 2 -]s -NH 2 (2b). |