Synthesis and spectroscopic studies of cyclo- and polyphosphazenes

The problems of synthesis, identification and determination of purity degre e of chlorocyclophosphazenes are very important. These compounds are substr ates of the synthesis of poly(diorgano)phosphazenes, the class of polymeric materials having wide application in many fields of technique and medicine . Poly(diorgano)phosphazenes are synthesized in the substitution reaction i nvolving the chlorine atom replacement in a poly(dichloro)phosphazene by a suitable group assuring desirable properties of a synthesized polymer (e.g. flexibility at low temperature, fastness to oils, biodegradability, etc.). To synthesize poly(dichloro)phosphazene, a hexachlorocyclotriphosphazene p urified by sublimation, crystallization and distillation was used. Usually the molecular mass and solubility of the obtained polymer depend on its deg ree of purity. For the determination of this property of hexachlorocyclotri phosphazene, IR spectrophotometry and P-31 NMR spectroscopy were used. (C) 2000 Elsevier Science Ltd. All rights reserved.