Viscoelastic studies of some phenols from dielectric measurements

Authors: Ayachit, Narasimha H.¹; Sannaninganavar, F. M.²; Deshpande, D. K.³

Source: Physics and Chemistry of Liquids, Volume 45, Number 3, June 2007 , pp. 359-368(10)

Publisher: Taylor and Francis Ltd

Abstract:

The variation of dielectric relaxation time with the viscosity of the medium is being exploited in drawing certain quantitative conclusions regarding molecular motion and intermolecular forces in liquids, liquid mixtures, dilute solutions and multi-component polar solutes in dilute solution. With no perfect empirical or theoretical equation in place for the variation of dielectric relaxation time with viscosity, the experimental investigations on different systems only can give an insight. In the present study the results of dielectric measurements carried out on pure samples of o-ethyl phenol, 2-n-butylphenol, 4-n-butylphenol, and 2,6-butylphenol in dilute solutions in different mixed solvents (benzene + paraffin) and on binary mixtures (1 : 1) of p-2-n-butylphenol + 4-n-butylphenol and p-bromonitrobenzene + 2,6-butylphenol, are reported. For comparison, the results on p-bromonitrobenzene + m-bromonitrobenzene as an example of mixture of non-associative liquids was also carried out and the results are presented. Different parameters determined using these dielectric measurements are also presented using different models and these studies indicate that the dielectric behavior at microwave frequencies favor the concept of dynamic viscosity and a single viscoelastic relaxation time for the system under study.

Keywords: Dielectric relaxation; Viscosity; Viscoelastic models; Phenols; Dynamic viscosity; High frequency rigidity modulus; Associative type liquids; Non-associative type liquids

Document Type: Research article

DOI: http://dx.doi.org/10.1080/00319100600847622

Affiliations: 1: Department of Physics, SDM College of Engg. and Tech. Dharwad, Karnataka, India 2: Department of Physics & BCA, Karnataka Science College, Dharwad, Karnataka, India 3: Department of Physics, Karnataka University, Dharwad, Karnataka, India

Publication date: 2007-06-01

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