Über N-(isothiocyanatoacylamino)carbonsäuren und ihre kondensationspolymerisation zu copolyamiden mit alternierender sequenz

N-Isothiocyanatoacylamino carboxylic acids are crystalline monomers, which were prepared from ω-isothiocyanato carboxylic acid chlorides and various aliphatic or aromatic amino carboxylic acids. Their condensation polymerization to copolyamides was investigated under various conditions. At reaction temperatures ≤200°C exclusively copolyamides with an alternating sequence were formed, whereas at 250°C amide exchange reactions brought about copolyamides with short homologous blocks. The sequence analysis was achieved by ¹H-NMR- or by ¹³C-NMR-spectroscopy. The average molecular weights of all copolyamides were found to be in the range of 5–10000.