Interfacial synthesis of bisphenol A tetrachlorocyclotriphosphazene from bisphenol A and hexachlorocyclotriphosphazene

Thin cyclomatrix polyphosphazene films: interfacial polymerization of hexachlorocyclotriphosphazene with aromatic biphenols

“…[19][20][21] Interestingly, IP has been successfully employed in the preparation of several HCCP-based molecules. Thompson et al 22 achieved selective di-substitution of HCCP with bisphenol A, yielding di(bisphenol A)-tetrachlorocyclotriphosphazene. Chen-Yang et al 23 prepared mono-through hexa-substituted ( phenoxy)cyclotriphosphazenes by interfacial condensation of HCCP with phenol.…”

Preparation of a cyclotriphosphazene microsphere bearing a phosphaphenanthrene structure towards fire-safety and mechanical enhancement for epoxy and its aramid fiber composite

“…30,31 Another chemical shift at around 27 ppm was caused by the different spatial configuration of DOPO. The results from 31 P NMR confirmed that the Cl atom was substituted by the DOPO conjugated structure.…”

“…28,29 Different from the 31 P NMR spectrum of HCCP with only chemical shift at À0.4 ppm, there were two obvious signals at 25.0 ppm and 6.3 ppm in the 31 P NMR spectrum of EHP, which were assigned to the phosphaphenanthrene and cyclotriphosphazene structure, respectively. 30,31 Another chemical shift at around 27 ppm was caused by the different spatial configuration of DOPO. The results from 31 P NMR confirmed that the Cl atom was substituted by the DOPO conjugated structure.…”

“…12 Hexachlorocyclotriphosphazene (HCCP) is a heterocyclic ring (PQN) structure consisting of phosphorus and nitrogen atoms, which is conducive to promoting the flame-retardant effect in the condensed phase. 13,14 Furthermore, the six chemically active chlorine atoms of HCCP can be easily substituted by other functional groups via nucleophilic reactions, 15,16 and some derivatives have been prepared to investigate the effect on epoxy resin. For example, HCCP was used to modify lignin to enhance the barrier effect of epoxy composites, 17 and 58.9% and 63.1% reduction were observed in heat and smoke release processes, respectively.…”