Silver-poly(4-vinylpyridine)(Ag-P4VP)hybrid microgels were synthesized by γ-irradiation and surfactant-free emulsion polymerization in a single step．The effects of dose rate and the concentrations of isopropanol

silver ion

N

N’-methylenebisacrylamide(Bis)and 4-vinylpyridine(4-VP)on the hybrid micmgels were studied in detail via transmission electron microscopy(TEM)

powder X—ray diffraction(XRD) or dynamic light scattering(DIS)．The results indicated that the size of Ag nanoparticles in the hybrid microgels increased with the increase of Ag+ or Bis concentration and with the decrease of dose rate or isopropanol concentration．When the dose rate Was decreased

the phase state of AS nanoparticles was gradually transformed from amorphous state to cubic crystalline state．Although the variety of the P4VP microgels’size was more coinplex

it could also be easily adjusted by the above—mentioned conditions．