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Nano-Silver/Polymer Composites Synthesized Synchronously in situ Emulsion Polymerization Ultrasonically

XIONG Jin-yu,XU Guo-cai(School of Chemical Engineering,Anhui University of Science and Technology,Huainan 232001,China)  
Silver-polymethyl methacrylate nanocomposites were successfully synthesized in the emulsion containing methyl methacrylate monomers and silver salt but neither initiator nor reductant contained in situ by ultrasonic radiating.The resultant Ag/PMMA nanocomposites were characterized by IR,HRTEM and TEM,and the results showed that nano-silver as core within the composites particles was uniform,polycrystalline and high order crystalline,and that there existed some degree of interaction between silver particles and polymer matrix.The effects of the experimental conditions on the final conversion of monomer were also researched.The interesting phenomenon was found that the polymerization was promoted by silver clusters,and the polymerization of monomer didn't occur without silver nitrate.The polymerization of monomer procreated easily in the presence of silver nitrate and the monomer conversion increased with silver nitrate increasing below its critical concentration.The thermal analysis results of the composites particles showed that decomposition of PMMA as shell within the composites particles was promoted by nano-silvers so that its decomposition temperature was ahead.
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