Synthesis And Study Of Polyphosphazenes And Their Derivatives

Inorganic polymers and their substitutes with a backbone of alternating phosphorus and nitrogen atoms, known as polyphosphazenes, include cyclophophazenes and linear polyphosphazenes. Cyclophophazenes often exhibit excellent fire retardancy and linear polyphosphazenes are used in different areas widely. Due to the special structure, polyphosphazenes can exhibit excellent properties.In this paper, the following research work have been carried out.This study began with the fundamental material of polyphosphazenes -hexachlorocyclotriphosphazene, by analyzing the influential factors , hexachlorocyclotriphosphazene was successfully synthesized. The structure and composition of the product were confirmed by FT-IR, 31P-NMR and monitoring the melt point.The direct substitution of hexachlorocyclotriphosphazene was studied. Tri(o-phenylenediamine)cyclotriphosphazene, tri(o-phenylenedihydroxyl)cyclotri-phosphazene and hexaisopropoxycyclotriphosphazene were successfully synthesized. The structure of products were characterized by FT-IR, 1H-NMR, 31P-NMR, DSC and TG.Poly(dichlorophosphazene) was synthesized by using the method of direct solid polymerization with the use of hexachlorocyclotriphosphazene. The structure of poly(dichlorophosphazene) was characterized and confirmed by FT-IR and 31P-NMR.By nucleophilic reaction, the paper produced the corresponding substitutes-polydi(a-naphthyloxy)phosphazene with poly(dichlorophosphazene). The structure of polydi(a-naphthyloxy)phosphazene was characterized by FT-IR, 31P-NMR, 31P-NMR and GPC.Tri(o-phenylenedihydroxyl)cyclotriphosphazene and polydi(a-naphthyloxy) phosphazene were used as flame-retardants to modify polyurethane. The temperature of decomposition and residue of polyurethane were analysized by TG curve.