(1) School of Materials Science and Engineering, Seoul National University, 151-742 Seoul, Korea
Abstract:
Polystyrene/layered silicate nanocomposites were prepared by melt intercalation. To examine the distribution of the clay in
polymer matrix, small angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) were used. Intercalated nanocomposites
were obtained and their rheological properties were investigated. Microcellular nanocomposite foams were produced by using
a supercritical fluid. As clay contents increased, the cell size decreased and the cell density increased. It was found that
layered silicates could operate as heterogeneous nucleation sites. As the saturation pressure increased and the saturation
temperature decreased, the cell size decreased and the cell density increased. Microcellular foams have different morphology
depending upon the dispersion state of nanoclays.