| Polypropylene is one of the popular plastics with preferable synthetical properties. Its defect of upper brittleness at low temperature restricts the further application of polypropylene. Lots of research on enhancing the touphness and intensity of polypropylene have been reported, such as mixing with elastomer and being filled in rigid inorganic particles,etc. These two methods of modifying polypropylene cannot increase the touphness and intensity simultaneously. In recent years, the hybrids based on polypropylene and inorganic clay minerals consisting of layered silicates have attracted great interest. The degree of modification was less than expectation value, however. A 'two-step' method that mixed matrix with mother material, which prepared by the method of in-situ graft-intercalation, was introduced successfully in preparing polypropylene/montmorillonite nanocomposites (PCM) in this paper. The tensile strength of PCM achieved 42. 41 MPa and the maximum value of toughness strength was 10. 50kJ/m2. The structural charactristics and crystallization behavior of the composites were studied by means of XRD, FT-IR, DSC, SEM and capillarirheometer. The results indicated that the melting temperature and heat-resistant capability of modified PP were increased. Furthermore, the montmorillonite (MMT) possessed obvious nucleation effect on the crystallization process of ?-PP, thus with added qualities of MMT, the mechanic properties of PCM material were enhanced as while increasing content of P -PP and decreasing dimension of a crystal. Meanwhile, the viscosity of PCM composites which is pseudoplastical was less than PP matrix. Process performance of PCMincreased to some extent with increasing content of MMT.
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