Some Polyamides, Polyesters, and Polyurethanes Containing AZO Groups

摘要

The paper discusses the synthesis of theN,N,#x2032;-azobis(formamidopropionic) acid (AFP), along with some characteristics determined from NMR spectrum, differential thermal analysis, and DSC. The behavior of AFP acid#x2014;as well as of its analogue,N,N#x2032;-azobis(formamidoacetic) acid (AFA)#x2014;has been studied in the reaction with aromatic diamine and with bis(glycol)terephthalate, leading to azopolymers of the azopolyamide, or azopolyester, type. On employingN,N#x2032;-bis(#x3B2;-hydroxyethyl) azobis-formamide (HEAF) as the azo bifunctional compound in the reaction with diphenylmethane diisocyanate, a polyurethane possessing azo groups was obtained. The structure of the azopolymers has been spectroscopically confirmed.