Polypropylene copolymer (co-PP)/silicon dioxide (SiO2) nanocomposites were prepared by melt extrusion in a twin-screw extruder. The isothermal crystallization behaviour of co-PP/SiO2 composites was investigated by differential scanning calorimetry. The SiO2 restricted the mobility of the co-PP molecular chains and retarded the crystallization of the co-PP component in the co-PP/SiO2 composites. A small amount of SiO2 (3 phr) could increase the tensile strength and elongation at break of the co-PP/SiO2 composites, and a high loading of SiO2 could decrease the tensile strength and elongation at break. Results of thermogravimetric analysis indicated that a small amount of SiO2 could greatly improve the thermal stability.
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