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Title: Dielectric relaxation studies of polyvinylpyrrolidone (PVP) and polyvinylbutyral (PVB) in benzene solutions at microwave frequency
Authors: Rawat, A
Mahavar, H K
Tanwar, A
Singh, P J
Keywords: Dielectric relaxation;Binary mixture;Dipole moment;Distribution parameter;Polyvinylpyrrolidone;Polyvinylbutyral
Issue Date: Sep-2014
Publisher: NISCAIR-CSIR, India
Abstract: Microwave dielectric relaxation measurements on polyvinylpyrrolidone (PVP), polyvinylbutyral (PVB) and their binary mixture have been done in dilute solutions of benzene at 9.015 GHz at 303K temperature. The heterogeneous molecular interactions and intra-molecular rotations of these polymers in dilute solutions have been studied by comparing the evaluated values of average relaxation time (τ0), relaxation times corresponding to overall molecular rotation (τ1) and intra-molecular rotation (τ2). The values of different dielectric parameters namely; static permittivity (є0), dielectric constant (є'), dielectric loss (є") and optical permittivity (є) have been determined for five different mole fractions of PVP-PVB. The dipole moment (μ) and free energy of activation ∆Fє were also calculated. It is observed that the value of μ decreases, whereas ∆Fє increases with the increase of mole fraction of PVP in the mixture. The higher values of the distribution parameter (α) indicate that besides the overall rotation, there is a large contribution of segmental reorientation and group rotation to the relaxation processes.
Page(s): 632-636
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.52(09) [September 2014]

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