Acylation of terminal amino groups in the synthesis of poly-m-phenyleneisophthalamide

Conclusions The reaction between terminal amino groups and dimethylacetamide in acid reaction solutions of PMPIA oligomers (or polymer) at elevated temperatures (80–90°C) has been investigated. The process takes place quantitatively and is catalyzed by the presence of hydrogen chloride. Similar relationships were obtained with m-phenylenediamine.The occurrence of the acylaton reaction via decomposition of dimethylacetamide has been confirmed by polarographic analysis of the accumulation of dimethylamine in the system and by potentiometric titration of the consumption of hydrogen chloride in binding up the dimethylamine which is liberated.Translated from Khimicheskie Volokna, No. 5, pp. 26–27. September–October, 1987.