Poly(methyl methacrylate) and polystyrene/clay nanocomposites prepared by in-situ polymerization

Poly(methyl methacrylate) (PMMA) and polystyrene (PS)/clay nanocomposites w ere prepared via in-situ bulk polymerization. The compatibility of the init iator and monomer with the clay surface was found to profoundly affect the clay dispersion. By using a surfactant containing a polymerizable group to modify the clay surface, exfoliated PMMA and PS/clay nanocomposites were sy nthesized. The clay dispersion was quantified by both X-ray diffraction (XR D) and transmission electron microscopy (TEM). The dimension stability of n anocomposites was studied and related to both nanoscale (layer separation) and mesoscale (long-range distribution) clay dispersion.