Abstract
Three ways have been studied for the preparation of phosphazene–metal oxide hybrids in which the phosphazene units were covalently linked to the metal through P–O–M bonds, condensation between hexachlorocyclotriphosphazene and metal alkoxides (Si, Ti), between hexaalkoxycyclotriphosphazene and metal chloride, and between the two chlorides in the presence of ether. Nonhydrolytic condensation between tetrachlorosilane or titanium chloride and hexaalkoxycyclotriphosphazene is the best way for the preparation of covalently linked cyclotriphosphazene–metal oxide hybrids. The composition of the hybrids can be controlled by using a mixture of alkoxyphosphazene, metal chloride and metal alkoxide when the metal is titanium or aluminium. This mode of condensation has been applied to polyphosphazene.
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