ABSTRACT:A novel aromatic diamine 2,3-di(3-aminophenyl)quinoxaline (DAPQ) was prepared from benzil through three steps. New aromatic polyamides were synthesized by the direct polycondensation of DAPQ and several aromatic dicarboxylic acids. The polyamides were obtained almost quantitatively. The inherent viscosities ranged from 0.49 to 0.56dl g-1 .The glass transition temperatures (T.s) of the polyamides ranged from 258 to 291 °C, and the temperatures at 10% weight loss (Td 10 s) ranged between 515 and 546°C. Novel aromatic polyimides were synthesized by the ring-opening polyaddition of several aromatic tetracarboxylic dianhydrides to DAPQ, followed by thermal cyclodehydration. The polyamic acids indicated the inherent viscosities of 0.28-1.13 dlg-1 . T.s of the polyimides ranged between 263 and 298°C, and Td 10s were above 550°C. The polyamides and polyimides were soluble in several organic solvents such as m-cresol.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.