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Polymerization of N-Vinylcarbazole (NVC) by Tungsten Blues (WB) and Evaluation of a Conducting PNVC-WB Nanocomposite Isolated from the System
Journal of Applied Polymer Science (2010)
  • Debanjana Ghosh, Presidency University
  • Mukul Biswas, Presidency College
Abstract
Tungsten oxide and tungsten blues (WB) prepared by reducing the former with stannous chloride were capable of initiating the bulk polymerization of N-vinylcarbazole (NVC) at the melting temperature of the latter (65°C). The polymerizations were initiated by a η2-type of complex formation involving π-clouds of vinyl group and the available d-orbitals of W6+ ions. A composite of PNVC with WB was isolated and characterized. Formation of PNVC and its incorporation in the composite was confirmed by FTIR, NMR, and UV absorption spectroscopic studies. Scanning electron micrographic analyses of PNVC-WB composite revealed the presence of close packed aggregates comprising particles of average sizes between 100–200nm range. TGA revealed the thermogravimmetric stability trend as WB > PNVC-WB > PNVC. Dc conductivities of PNVC-WB nanocomposite were found to depend on the WB : PNVC weight ratio in the composite and varied from 3.5 × 10−4 (weight ratio 26) to 3 × 10−2 S/cm (weight ratio 100) at room temperature. The threshold WB : PNVC weight ratio for the manifestation of conductivity in the composite was around 25 under the experimental condition of this study.
Keywords
  • N-vinylcarbazole,
  • NVC,
  • Polymer science,
  • Polymerization
Disciplines
Publication Date
March 29, 2010
DOI
10.1002/app.31859
Citation Information
Debanjana Ghosh and Mukul Biswas. "Polymerization of N-Vinylcarbazole (NVC) by Tungsten Blues (WB) and Evaluation of a Conducting PNVC-WB Nanocomposite Isolated from the System" Journal of Applied Polymer Science Vol. 117 Iss. 3 (2010) p. 1371 - 1377
Available at: http://works.bepress.com/debanjana-ghosh/16/