Abstract
A poly(N-vinylcarbazole) (PNVC)–formalin (FO) resin (PNVC-FO) was prepared via copolycondensation between N-vinylcarbazole (NVC) and FO in the presence of dry HCl gas in toluene medium at 110°C. A highly conducting composite of PNVC-FO resin with nanodimensional acetylene black (AB) was prepared by carrying out the polycondensation reaction in presence of a suspension of acetylene black (AB) in toluene. The inclusion of PNVC in the PNVC-FO-AB composite was confirmed by FT-IR analysis. Scanning electron microscopic analyses of PNVC-FO resin and PNVC-FO-AB composite revealed formation of spherical particles and aggregates of irregular shapes respectively. Thermogravimetric analyses revealed the overall stability order as: AB > PNVC-FO-AB composite > PNVC-FO resin > PNVC homopolymer. In sharp contrast to PNVC and PNVC-FO resin, which were both nonconducting (10−12 to 10−16 S/cm), the conductivity of the composites reached values between 0.75 S/cm and 6.54 S/cm corresponding to AB loading of 28–49 wt % respectively. Temperature versus conductivity studies revealed an initial increase in conductivity upto 200°C and current–voltage characteristics of the PNVC-FO-AB composite showed a linear trend consistent with Ohmic behavior. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 3837–3843, 2007
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