O-chloranil initiated polymerization of pyrrole in presence of N-vinylcarbazole and some properties of the polymer

✍ Scribed by Mukul Biswas; Anindita Roy

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 561 KB
• Volume: 31
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(95)00033-x

✦ Synopsis

The polymerization of a mixture of N-vinylcarbazole (NVC) and pyrrole (PY) by 0-chloranil in toluene yields an insoluble black polymer P(PY-NVC) which exhibits properties distinct from PPY or PNVC. The inclusion of either monomer moieties in P(PY-NVC) has been endorsed by IR spectroscopy. Kinetics of PPY-OCA homopolymerization and of PY-NVC-OCA copolymerization have been elucidated. TGA reveals the stability order as PNVC > P(PY-NVC) > PPY. DSC analyses reveal a single inflection for P(PY-NVC) around (198-202°C) and for PPY and PNVC around 180 and 228°C respectively. PPY exhibits a high dielectric constant (-350) at 10 Hz while P(PY-NVC) or PNVC exhibit values (_ II) and (-5) respectively-the dielectric constant falling consistently with increasing frequency as does the dielectric loss parameter also-suggesting interfacial polarization. P(PY-NVC) shows maximum d.c. conductivity of 3.5 x lO-h ohm-' cm-' depending on [PY]/[NVC] mole ratio. For PPY, the conductivity is in the range (10~'~10-5)ohm~' cm-' and the conductivity in all these polymers is dependent on the concentrations of the monomers, O-CA and runs parallel to the trend in conversion.