Expansion distribution of basal spacing of the silicate layers in polyaniline/Na+-montmorillonite nanocomposites monitored with X-ray diffraction

Polyaniline/Na+-montmorillonite (Na+-MMT) nanocomposites synthesized by in- situ intercalative polymerization of aniline into Na+-MMT are reported. The expansion distribution of basal spacing of the silicate layers upon the in crease of the amount of aniline relative to Na+-MMT is, for the first time, estimated from the square of the full-width at half-maximum (FWHM2) of XRD patterns. According to the FT-IR frequency shift of the C-N stretching vib ration, the change in the basal spacing of the silicate layers is closely r elated to the degree of hydrogen bonding between polyaniline and the silica te basal surface in a confined geometry.