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The Study of Mechanisms of Charge Production in Pure and Sensitized Polymer Films

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Author Affiliations

  • 1Department of Physics, Govt. College Khategaon, Dist. Dewas, MP, INDIA
  • 2Dept. of PG Studies and Research in Physics and Electronics, RD University, Jabalpur, MP, INDIA

Res. J. Recent Sci., Volume 1, Issue (ISC-2011), Pages 238-243, (2012)

Abstract

The mechanisms of charge production in pure and malachite green sensitized Polyvinyl chloride (PVC) samples have been studiedby short circuit thermally stimulated depolarization current (TSDC) measurement and ultraviolet spectroscopy (U.V.) studies. Thesamples were prepared by the casting from solution technique whose thickness measured around 30µm. The samples weresandwiched between similar aluminum electrodes and polarized at temperature 105oC with polarizing fields 20, 30, 40 and50kV/cm. Two peaks current maximum found around at 63±8 and138±7°C for pure, 06 and 7.5% sensitized PVC samples, while forhigher concentration (i.e.10 and 15%) one peak was measured around ˜65oC in positive direction and the other peak around˜140oC in the negative direction. The TSDC spectra have been used to calculate activation energy by initial rise method .Thecalculated activation energies are 0.389-0.719ev for pure PVC and 0.298-1.09ev for sensitized PVC samples. The magnitude ofpeak current increases with polarizing field and temperature, dipolar, space charge and charge transfer complexes mechanismsmay be responsible for this nature. In the case of UV spectra no band appears in pure PVC however the addition of malachitegreen, gives rise four absorption bands around 260, 310, 440, and 630nm.The average effect has been observed in the intensity ofthird (400-450nm) and fourth bands (550-700nm). The formation of charge transfer complexes is evidenced in the UV-visibleabsorption spectra by the appearance and change in the intensity of absorption bands.

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