Using hexachlorocyclotriphosphazene (HCCP ) and 4

4′-sulfonyldiphenol (BPS ) as comonomers

triethylamine(TEA)as acid-acceptor

and polystyrene(PS)microspheres prepared through dispersion polymerization as template

PS/polyphosphazene(core/shell)composite microspheres were firstly prepared at room temperature.The as-prepared composite microspheres were then etched with tetrahydrofuran to remove PS core materials

and hollow polyphosphazene microspheres were successfully obtained.The morphology and structure of the hollow microspheres were characterized by FTIR

EA

SEM and TEM.Results showed that the hollow polyphosphazene microspheres possessed highly cross-linked chemical structure.The hollow core size of the hollow microspheres was depended on the diameter of as-used PS template

and the shell thickness could be controlled by adjusting the mass ratio of PS to comonomers.In addition

the formation mechanism of the hollow polyphosphazene microspheres was proposed.