Nanofillers in polymeric matrix: a study on silica reinforced PA6

The study was carried out on nanocomposites consisting of nanoscopic silica fillers embedded in polyamide 6. Various composite systems were prepared t hrough in situ polymerisation, with different elementary particle diameters and filler contents as variables. The morphological investigation demonstrated the non influence of the parti cle presence on the crystalline phase of such composites. The introduction of filler leads to an obvious reinforcement of the matrix elastic modulus: the observed increase depends on the modulus difference be tween the various phases present, the filler content and its dispersion sta te. In the same way, the yield point, in both compressive and tensile tests , is found to be sensitive to the latter parameters. Complementary experiments enable to suggest possible local events leading t o the rupture of these composite systems. (C) 2001 Elsevier Science Ltd. Al l rights reserved.