A novel elastomeric polyurethane／montmorillonite nanocomposite based on poly(propylene glycol)

4

4′-diphenylmethane diisocynate and 1

4-butanediol was synthesized by intercalative polymerization technology．Octadecylamine was used as swelling agents to treat Na- montmorillonite and form organomontmorillonite through ion exchange. Nanoscale dispersing of clay in the nanocomposite was analyzed by X-ray diffraction and Molau experiment．At the same time

X-ray diffraction result showed that the intercalated nanocomposites were formed Hydrogen bonding in the hard segments of the synthesized polyurethane／montmorillonite nanocomposite was found to decrease with the increasing amount of montmorillonite

but reached a minimum at 5 wt％ montmorillonite concentration

as was evidenced by FTIR studies．DMA and DSC results showed that the glass transition temperature was reduced with increasing of montmorillonite concentration．Introducing 3％ organomontmorillonite in the composites resulted in a 45％ increase in the tensile strength and a 35％ increase in the elongation as compared to thoee of pure PU．