Novel alkenyl substituted cyclophosphazenes for the synthesis of thermally stable polymers

The synthesis of some new alkenyl substituted tetrachlorocyclophosphazenes is discussed. The reaction of acetyl chloride with hydridocyclophosphazene yielded a vinylacetate derivative or a carbon-bridged bicyclophosphazene. Elimination reactions with (NPCl2)(2)NP(Pr-i)C(CH3)(2)OSO2CH3 yielded a propene derivative and an ANSA compound. X-ray structures of the bicyclophosphazene and ANSA compound are presented. The vinylacetate and propene derivatives did not homopolymerize under radical conditions. Copolymerization with styrene resulted in polymers with a maximum incorporation of 17 mol% for the vinylacetate derivative and 18 mol% for the propene derivative. In TGA studies high char yields up to 64 wt% were observed for the home- and copolymers of the vinylbenzyl substituted tetrachlorocyclophosphazene. XPS studies showed the residue to contain P, N and C