Polymer\Ag composite microspheres produced by water-in-oil-in-water emulsion polymerization and their application for a preservative

Nanosized Ag particles were entrapped successfully in multihollow porous poly(methyl methacrylate) (PMMA) microspheres by water-in-oil-in-water emulsion polymerization. The structure of the PMMA\ g microspheres prepared was characterized by scanning electron Amicroscopy and X-ray powder diffraction analysis. It was found that the Ag nanoparticles Awere impregnated in the inner voids of the microspheres and they had a face-centered cubic structure. In the preservation test, the PMMA\Ag microspheres showed a powerful antibacterial performance, indicating that the Ag ions released effectively through the Ananosized pore channel of the PMMA wall