In literatures montmorillonite’s organic modification usually use one-step intercalation method

we developed a two-step intercalation method by using two different organic salts continuously．After eomparing the effects of one-step method and two-step method

we found that the effect of two-step intercalation method was much better than that of one-step method．The nanocomposites were prepared bysuspension polymerization of methyl methacrylate(MMA)containing intercalated montmorillonite

and the resuIts of their FT-IR

XRD and SEM studies proved that the montmorillonite was effectively swollen or exfoliated Adding montmorillonite could affect the process of suspension polymerization．We found that the conversion of monomer was lowered

the shape of polymer granules was changed to be irregular

and granules’diameter was enlarged．DSC

solvency experiment and strain experiment showed that adding montmorillonite may improve the properties of PMMA because of polymer’s cross-linking by montmorillonite．The best weight content of montmorillonite was about 3％．