| Because of its many particular properties in optics, acoustics, electricity, magnetics, heat, catalysis, mechanics, chemical activity , etc, and its great potential high technology applied prospects, nanoparticles have become one of the quite popular suject in materials reserch fields. Inorganic-organic nanocomposites summarize the characteristics of inorganic material, organic material and nanomaterial,so they have new applications in many fields such as electronics , chemistry , catalyst , mechanics , biochemistry , etc. Silver halide which has good light sensitivity was widely used in photochromic materials and photographic emulsions. In this thesis ,AgBr hydrosol was prepared by NaBr (aqueous solution of certain concentration) titrating AgNO3 (aqueous solution of certain concentration) and AgNO3 titrating NaBr. The effect factors to AgBr hydrosol were discussed and analysed. For the first time ,AgBr organosol was obtained by using oleic acid to extract and modify the AgBr nanoparticles in hydrosol. And the optimum molar ratio of oleic acid to AgBr nanoparticles was found. AgBr nanoparticles, modified by oleic acid were mixed with MMA. After polymerization was carried out, the polymeric photochromic material was synthesized. The prepared samples were deeply investigated by XRD,ED,TEM,SEM ,etc.
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