Elaboration of hybrid organic-inorganic nanoparticles by heterogeneous polymerization technology arouse highly interest all over the world because of both the direct application in paint

water-borne adhesive

coating formulations and the potential application in bio—technology field．A new type of organic—inorganic hybrid materials synthesized by the monomers containing alkoxysilane and vinyl groups is highly evaluated because it improves the chemical bonding between the organic and the inorganic components．However

it is seldom used to synthesis nanoparticles because the hydrolysis and condensation of alkoxysilane groups are hardly controlled in heterogeneous polymerization．In this paper

the mechanism of the emulsion copolymerization of 3-trimethoxysilylpropyl methacrylate (MPS)and styrene is studied．The mechanisms of particle morphology and microstructure formation at different conditions are analyzed by following the resultant of hydrolysis using GC

particle size and its distribution by DIS

and the characterization of the morphology of the latex and the microstructure of the polymer with transmission electron microscopy(TEM)

infrared(IR)and solid—state NMR．It is found that the processes are carried out with different mechanism at various operating conditions

and the bydrolysis and condensation rates in the media and the partitioning of MPS are the most important parameters．