In recent years

the hybrids based on organic polymers and inorganic clay minerals consisting of layered silicates have attracted great interest from both scientific and industry fields

since they exhibit dramatic increases in their mechanical and thermal properties synergistically derived from the two components.In this paper the in-situ graft-intercalation method has been introduced successfully in preparing polypropylene/montmorillonite nanocomposites (PPMNC).The spaces of silicate layers of montmorillonite in the composites were investigated by using X-ray diffractometer.It was found that the space of the layers increased form1.9nm up to about 4nm.The dynamic mechanical properties of PPMNCs were also studied The results showed that the ynamic storage modulus of PPMNCs was higher than that of PP

as high as 2 times

especially at temperatures above 80℃.