A free radical polymerization mechanism for ultrasonically irradiated emulsion polymerization was proposed . ( 2 ) ultrasonically irradiated encapsulating emulsion polymerization was first used to prepare polymer / inorganic nanoparticles composites 二、采用超声辐照包裹乳液聚合法制备了长期稳定的、聚合物包裹无机纳米粒子的胶乳体系,处理后得到聚合物/无机纳米粒子复合材料。