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IJEMS Vol.15(4) [August 2008] >


Title: Studies on dielectric properties of a conducting polymer nanocomposite system
Authors: Mohapatra, Saumya R
Thakur, Awalendra K
Choudhary, R N P
Keywords: Nanocomposite
Dielectric spectroscopy
Tangent loss
Dipole-segmental relaxation
Issue Date: Aug-2008
Publisher: CSIR
Abstract: Dielectric analysis of ion conducting solid polymer nanocomposite has been investigated as a function of temperature and frequency. Effect of clay concentration in changing the dielectric relaxation behaviour of polymer salt complex film is clearly visible, observed in terms of changes in polymer chain relaxation and dipolar contribution due to ion pairs. An enhancement in relative permittivity by 2 orders of magnitude has been recorded at room temperature in nanocomposite films controlled predominantly by clay concentration. Almost similar behaviour has been observed after crystalline to amorphous phase transition temperature at T ≥70°C for both polymer salt complex and nanocomposite films irrespective of clay concentration. A lowering of relaxation time, attributed to relaxing dipoles, with clay concentration suggests faster ion dynamics in nanocomposite films.
Page(s): 347-351
ISSN: 0971-4588
Source: IJEMS Vol.15(4) [August 2008]

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