Poly (methyl methacrylate)/vermiculite PMMA/VMT nanoeomposites were synthesized by emulsion polymerizations in aqueous dispersions containing vermiculite which were modified by methacryloyloxyethyl trimethyl ammonium chloride (DMC) The structure of the nanocomposite was investigated by XRD
FT-IR
DSC and TGA.The results shows that exfoliate structures of vermiculite exist in the PMMA/VMT nanocomposites.ThelTilal decomposition temperature and glass transition temperature of PMMA/VMT nanocomposites have been improved at lower VMT contents(≤1.0 wt%).The reaction rate of polymerization decreased with adding vermiculite modified by DMC.The viscosity average molecular weiight of PMMA/VMT nanocomposites has been in creased.