1610687-69-8Relevant articles and documents
Synthesis and characterization of soluble and thermally stable poly(ether-imide-urea)s
Toiserkani, Hojjat
, p. 631 - 638 (2014)
Two series of new modified poly(ether-imide-urea)s, POa-P Oc and PSa-PSc, with benzoxazole or benzothiazole pendent groups were successfully synthesized by diphenyl azidophosphate (DPAP)-activated one-pot polyaddition reaction of two bis(imide-dicarboxylic acid)s, 2-[3,5-bis(4-trimellitimidophenoxy)phenyl] benzoxazole (1O) or 2-[3,5-bis(4-trimellitimidophenoxy)phenyl] benzothiazole (1S) with various kinds of aromatic diamines a-c. In this direct method, the polymers were prepared by polyaddition reactions of the in situ-formed diisocyanate with the aromatic diamines. For comparative purposes, reference poly(ether-imide-urea)s, PRa-PRc, were also prepared by reacting a bis(imide-dicarboxylic acid) lacking pendent groups, namely, 3,5-bis(4-trimellitimidophenoxy)benzene (2) with the same diamines under similar conditions. Characterization of polymers was accomplished by inherent viscosity measurements, FTIR, 1H NMR spectroscopy and thermogravimetry. The polymers were obtained in quantitative yields with inherent viscosities between 0.19 and 0.37 dL g-1. The solubilities of modified poly(ether-imide-urea)s in common organic solvents as well as their thermal stability were enhanced compared to these of the corresponding unmodified poly(etherimide-urea)s. The glass-transition temperature, 10% weight loss temperature, and char yields at 800°C were, respectively, 7-28, 14-38°C, and 3-7% higher than those of the reference polymers in nitrogen atmosphere.
