The enhancement on thermal stability and charring–forming capability of nitration group

to obtain a novel charring agent, hexaphenoxy-cyclotriphosphazene (hctp) was designed to be nitrified hexaphenoxy-cyclotriphosphazene (n-hctp) by one step of nitration. then the charring capability and thermal degradation behaviors of hctp and n-hctp were extensively investigated with the thermogravimetric analysis (tg) under pure nitrogen and air, respectively. tg results showed that nitration made the char residue yield of n-hctp increase from 0 to 40% under nitrogen. and the effects of nitration made the char residue yield of n-hctp increase from 0 to 2.3% under air. meanwhile, tg was used to show the effect of nitration in inducing charring of acrylonitrile–butadiene–styrene under nitrogen. with 30% addition of n-hctp, the char residual yield increased from 0.9 to 22%. then tg/ftir was used to research their gaseous products and their releasing intensity during decomposition. the tg/ftir showed that the nitration made the decomposition of n-hctp completely different from that of hctp.