| The latex obtained by emulsifier-free emulsion polymerization show good adhesion and water-resistant properties and characterized by having a narrow size distribution and clear surface. They had been applied widely in biological system.In the paper polymer nanomaterial was synthesized in a sealed container with solvothermal method which is usually used to prepare inorganic nanomaterial, it is easy to perform the experiment and control required condition, monomer and solvent can not vaporize and environment is protested.Solvothermal method was combined with emulsifier-free emulsion polymerization to prepare PMMA-St copolymer nanoparticles of average particle diameters about 31nm with KPS as initiator. The conversion was followed gravimertrically at different stage during reaction and nanoparticle was characterized with TEM,IR and H1-NMR. The effects of amount of acetone, MMA/St proportion, the concentration of KPS and temperature on the polymerization rate, the average particle size and the particle distribution as well as the test of stability of latex were investigated systematically. The mechanism of emulsifier-free emulsion polymerization with solvothermal method was discussed .The major result showed:1) The results indicated that with increasing the temperature, the average particle size decreased first, and then increased and reached a minimum at 90?С. With increasing the volume proportion of acetone, the average particle size decreased remarkably and the stability of latex increased obviously.
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