Nanocomposites were prepared by a simple technique of emulsion polymerization using VC monomer and Na + montmorillonite. The nano structure of the composites was studied with the aid of X ray diffraction and t ransmission electron microscopy,and the mechanical and thermal properties of th e composites were also tested. The results showed that the silicate layers were delam inated or partially exfoliated in the PVC matrix. The impact strength of the mat erial with 2 1% MMT was almost two times as high as that of pure PVC, while the tensi le strength decreased little. However, the mechanical strength of the composites began to decrease with further increasing the amount of MMT. The TGA resul ts showed that the temperature,at which a 50% weight loss of the composites occurred,was higher than that of pure PVC. The vicat softening temperatures of composites were enhanced with increasing MMT content.
