For the synthesis of a ladder polyamide, 4,6-diaminoisophthalic acid-type monomers were synthesized and their polymerization was studied. Although the polymerization of the A2- and B2-type monomers with a base afforded small molecular weight-products, the polymerization of the AB-type monomer gave higher molecular weight-products. Analysis of the products by means of matrix-assisted laser desorption ionization time-of-flight mass spectrometry revealed that they were composed of polymers and oligomers with linear and cyclic structure.
- Akihiro Yokoyama
- Makoto Karasawa
- Tsutomu Yokozawa
