Synthesis and Thermal Properties of High Residual Poly(Cyclotriphosphazene-Aryl Amide) at High Temperature

Hexachlorocyclotriphosphazene was reacted by nucleophilic substitution with nucleophilic sodium phenate and 4,4'-diaminodiphenyl ether to synthetize 2,4- bis4'-(4''-aminophenoxy)phenylamino tetraphenoxyl cyclotriphosphazene (AOPPZ). Then AOPPZ and paraphthaloyl chloride were polymerized to a novel poly(cyclotriphosphazene-aryl amide) (POPA). The chemical structures of AOPPZ and POPA were characterized by Fourier transform infrared and nuclear magnetic resonance. Results show that the existences of phenoxy substituent structures were proved on AOPPZ and POPA, and six Cl atoms on cyclotriphosphazene ring were replaced completely. Polyamide structure was also founded in the main chain of POPA. The initial decomposition temperature of AOPPZ was round 200 ℃, and its solid residual amount was 56.4wt % at 600 ℃, but POPA initial decomposition temperature was 220 ℃, the maximum degradation rate at 355 ℃, and 55.6wt % of POPA remained at 600 ℃.