Polyphosphazenes are hybrid inorganic-organic polymers composed of a backbone containing alternative phosphorus and nitrogen atoms with two(usually organic)side groups linked to each phosphorus atom.Various properties can be obtained due to the high flexibility in molecular design of polyphosphazene chemistry.Biocompatibility,biodegrability and functionalization are among the key factors in determining the applications of biodegradable polyphosphazenes in biomedical fields.In this paper,functional polyphosp...