Effect of dopant and clay on nanocomposites of polyaniline (PAN) intercalated into Na+-montmorillonite (N+-MMT)

The nanocomposites of polyaniline (PAN) and Na+-montmorilionite (Na+- MMT) were synthesized by emulsion polymerization using dodecylbenzenesulfonic ac id (DBSA) or camphorsulfonic acid (CSA) as dopant and emulsifier. In the X- ray diffraction patterns of the systems, we observed that the layer of cond ucting PAN-DBSA or PAN-CSA between the clay layers was in nanoscale layers (< 10 Angstrom). The temperature dependence of dc conductivity [sigma (dc)( T)] for the nanocomposites followed a quasi-one dimensional (1D) variable r ange hopping (VRH) model. The sigma (dc)(T) varied with the dopant used and the molar ratio. From temperature dependent EPR experiments, we obtained t he magnetic susceptibility and the line width of the system. The Na+-MMT cl ay layer plays important role for interchain interaction of the system. The effects of dopant and the layer of Na+-MMT on charge transport and structu re are discussed.