Hexachlorocyclotriphosphazene and poly(dichlorophosphazene) react with the sodium salt of ethyl p-hydroxybenzoate to give small molecule cyclic and high polymeric phosphazenes with aryloxy ester side groups; reaction of these compounds with potassium tert-butoxide brings about complete hydrolysis of...http://www.google.fr/patents/US5053451?utm_source=gb-gplus-shareBrevet US5053451 - Ionically cross-linkable polyphosphazene: poly(bis(carboxylatophenoxy) phosphazene) and its hydrogels and membranes
