N-vinylcarbazole (NVC) was polymerized by 13X zeolite alone in melt (65 degrees C) or in toluene (110 degrees C) and a poly(N-vinylcarbazole) (PNVC)-13X composite was isolated. Composites of polypyrrole (PPY) and polyaniline(PANI) with 13X zeolite were prepared via polymerization of the respective monomers in the presence of dispersion of 13X zeolite in water (CuCl2 oxidant) and in CHCl3 (FeCl3 oxidant) at an ambient temperature. The composites were characterized by Fourier transform infrared analyses. Scanning electron microscopic analyses of various composites indicated the formation of lumpy aggregates of irregular sizes distinct from the morphology of unmodified 13X zeolite. X-ray diffraction analysis revealed some typical differences between the various composites, depending upon the nature of the polymer incorporated. Thermogravimetric analyses revealed the stability order as: 13X-zeolite > polymer-13X-zeolite > polymer. PNVC-13X composite was essentially a nonconductor, while PPY-13X and PANI-13X composites showed direct current conductivity in the order of 10(-4) S/cm in either system. However, the conductivity of PNVC-13X composite could be improved to 10(-5) and 10(-6) S/cm by loading PPY and PANI, respectively. (c) 2006 Wiley Periodicals, Inc.