Surface modified clay/polypropylene (PP) nanocomposites: Effect on physico-mechanical, thermal and morphological properties

Polypropylene/surface modified clay nanocomposites were prepared by melt intercalation in twin-screw extruder followed by blown film extrusion. The effects of organically modified clay on the physical, mechanical, thermal and morphological properties of the prepared nanocomposites were studied. The results showed that 95% enhancement in tensile strength and 152% increase in tensile modulus was observed. TGA analysis in inert atmosphere showed an 87 C marked increase in the thermal degradation temperature. The DSC curve showed the melting point was increased 4 degrees C in presence of clay in the matrix owing to the fact that the filler acts as reinforcing effect. The dynamic mechanical analysis (DMA) results showed improvement in storage modulus from 9.76 x 10(3) to 1.12 x 10(4) MPa with the incorporation of organically modified clay and thus enhanced its stiffness. The morphology of the nanocomposites was further studied using scanning electron microscopy (SEM). The X-ray diffraction (XRD) and transmission electron microscopy (TEM) which confirmed the exfoliation structure of the nanocomposites. (C) 2008 Elsevier Ltd. All rights reserved.