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Title: Microwave dielectric relaxation study of poly (methyl methacrylate) and polysulphone in dilute solutions
Authors: Tanwar, A
Gupta, K K
Singh, P J
Vijay, Y K
Keywords: Dielectric relaxation
Poly (methyl methacrylate)
Dipole-dipole interaction
Issue Date: Jul-2006
Publisher: CSIR
IPC CodeG01R27/26
Abstract: Dielectric relaxation studies of poly (methyl methacrylate) in dilute solutions of benzene and 1,4-dioxane and polysulphone in dilute solutions of 1,4-dioxane have been carried out at 8.92 GHz and temperatures 30, 40, 50, 60ºC, respectively. Average relaxation time τ 0, and relaxation times corresponding to group rotation τ(1) , segmental motion τ(2) and dipole moment  have been determined. The results have been interpreted by the internal and hindered rotation of ester group and sulphone unit for PMMA and polysulphone, respectively. The study reveals the existence of both, the intramolecular and overall orientations in PMMA and polysulphone. Thermodynamic parameters, viz. free energy, enthalpy and entropy of activation have been calculated using the dielectric data. Thermodynamic parameters indicate existence of cooperative orientation in the molecule resulting from the dipole-dipole interaction.
Page(s): 548-553
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.44(07) [July 2006]

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