Author(s):
Ravi Kant and M. Fahim

Abstract:
The present paper reports the dielectric behaviour of high molecular weight water soluble polyvinyl alcohol (PVA) system doped with a dicarboxylic acid (succinic acid). Doped PVA samples were synthesized in the laboratory using solution casting method by keeping an optimum concentration of succinic acid (30 wt%) in PVA solution. These samples were characterised for their structural behaviour using FT-IR and XRD while frequency and temperature dependent dielectric properties were measured using Agilent LCR meter. It was observed that dielectric permittivity () of 30wt% acid doped PVA significantly increased compared to undoped PVA. This was attributed to the increase in the amorphous regions with acid doping that facilitated the orientations of dipoles. At all frequencies, room temperature dielectric properties ( and ) of both undoped and doped samples showed a frequency dispersive behaviour. FT-IR and XRD analyses confirmed the increase in amorphous regions in doped samples compared to undoped semi-crystalline PVA.

Pages: 649-656

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