Dielectric properties of solution-grown-undoped and acrylic-acid-doped ethyl cellulose

Dielectric capacities and losses were measured, in the temperature (50–170°C) and frequency (01–100 kHz range), for undoped and acrylic acid (AA) doped ethyl cellulose (EC) films (thickness about 20 μm) with progressive increase in the concentration of dopant in the polymer matrix. The variation of...

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Bibliographic Details
Published in:Bulletin of materials science 2000-02, Vol.23 (1), p.17-21
Main Authors: Khare, P. K., Jain, Sandeep K.
Format: Article
Language:English
Subjects:
Acrylic acid
Chain mobility
Charge transfer
Dielectric loss
Dielectric properties
Dielectrics
Dopants
Ethyl cellulose
Film thickness
Glass
Glass transition temperature
Molecular motion
Polymers
Thermal expansion
Thickness
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Summary:Dielectric capacities and losses were measured, in the temperature (50–170°C) and frequency (01–100 kHz range), for undoped and acrylic acid (AA) doped ethyl cellulose (EC) films (thickness about 20 μm) with progressive increase in the concentration of dopant in the polymer matrix. The variation of capacity with temperature is attributed to thermal expansion in the lower temperature region to the orientation of dipolar molecules in the neighbourhood of glass transition temperature (Tg) and random thermal motion of molecules aboveTg. The dielectric losses exhibit a broad peak. Doping with AA is found to affect the magnitude and position of the peak. AA is found to have a two-fold action. Firstly, it enhances the chain mobility and secondly, it increases the dielectric loss by forming charge transfer complexes.
ISSN:0250-4707
0973-7669
DOI:10.1007/BF02708605