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Dielectric Characteristics of Poly(N-Vinylcarbazole) and Its Nanocomposites with ZnO and Acetylene Black
Materials Chemistry and Physics (2010)
  • Debanjana Ghosh, Presidency College
  • Pinki Saha Sardar, Presidency College
  • Mukul Biswas, Presidency College
  • Anup Mondal, Bengal Engineering and Science University
  • Nillohit Mukherjee, Bengal Engineering and Science University
Abstract
Dielectric constant and dielectric loss parameters of poly(N-vinylcarbazole) homopolymer and several nanocomposites of poly(N-vinylcarbazole) with ZnO were studied as a function of frequency. In the low frequency range (0–20 kHz) the dielectric constant values of the base polymer varied from ∼30 to ∼2, and the same for the composite varied from 8500 to 2000 (4.54), 5000 to 1000 (2.63) and 2000 to 500 (1.17), the figures in parenthesis denoting the ratio of ZnO:PNVC in the nanocomposites. Likewise, dielectric loss parameters were found to be (7–10 × 10−3) for the homopolymer and 4.0, 2.5 and 1.25 for the three PNVC–ZnO composites respectively. Notably, a mechanical mixture of ZnO and PNVC (1.17) exhibited much lower dielectric constant (400–25) and loss parameters (0.14–0.065). These features imply polarization was differently affected depending on factors such as grain size and grain-boundary interfaces being formed in these systems. Tan δ–temperature variation for the composites revealed the occurrence of a maximum between 60 and 70 °C. These features signified dipole group loss in the composite. Dielectric constant of a conducting nanocomposite of poly(N-vinylcarbazole) with acetylene black revealed very low negative value tending to zero at high frequency.
Keywords
  • Poly(N-vinylcarbazole),
  • ZnO,
  • Acetylene black,
  • Nanocomposites,
  • Dielectrics properties,
  • Polarization
Disciplines
Publication Date
May 14, 2010
DOI
10.1016/j.matchemphys.2010.04.019
Citation Information
Debanjana Ghosh, Pinki Saha Sardar, Mukul Biswas, Anup Mondal, et al.. "Dielectric Characteristics of Poly(N-Vinylcarbazole) and Its Nanocomposites with ZnO and Acetylene Black" Materials Chemistry and Physics Vol. 123 Iss. 1 (2010) p. 9 - 12
Available at: http://works.bepress.com/debanjana-ghosh/15/