THERMAL-STABILITY, MORPHOLOGICAL, DIELECTRIC, AND CONDUCTIVITY CHARACTERISTICS OF PYRROLE MODIFIED POLY-N-VINYL CARBAZOLE

N-vinyl-Carbazole (NVC) has been polymerized in the presence of pyrrole (PY) by anhydrous ferric chloride. The copolymer has been characterized by IR Spectroscopy. Thermal stability of P(PY-NVC) is intermediate between that of PNVC and PPY, respectively. DSC reveals a single glass transition break at 180-200-degrees-C for P (PY-NVC), which is higher than the T(g) for polypyrrole (approximately 165-degrees-C), but is lower than that for PNVC (approximately 227-degrees-C). The XRD analysis reveals PPY to be totally amorphous and shows the percent crystallinity for P (PY-NVC) to be less than that of PNVC. Dielectric constants of the polymers follow the trend: PPY > P (PY-NVC) > PNVC, and fall sharply with the applied frequency to a limiting value. The polymers are characterized by a broad dielectric relaxation. DC conductivity is dependent on temperature and FeCl3/polymer mole ratio and at a particular temperature follows the trend: PPY > P (PY-NVC) > PNVC. (C) 1993 John Wiley & Sons, Inc.