ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Dielectric relaxation of butyl acrylate—alcohol mixtures using time domain reflectometry

K. Dharmalingam, K. Ramachandran, P. Sivagurunathan, B. Prabhakar Undre, P. W. Khirade, and S. C. Mehrotra

Department of Physics, Annamalai University, Annamalai Nagar, 608 002, Tamilnadu, India

E-mail: mukdhar97@rediffmail.com

Received: 30 June 2006  Revised: 6 August 2006  Accepted: 7 September 2006

Abstract: Dielectric relaxation measurements of butyl acrylate—alcohol mixtures at different concentrations and temperatures within the frequency range of 10 MHz to 10 GHz have been carried out using time domain reflectometry. Parameters such as the static permittivity, dielectric relaxation time, the Kirkwood correlation factor, the excess inverse relaxation time, and thermodynamic functions were determined and discussed to yield information on the molecular structure and dynamics of the mixture. The value of the dielectric properties decreases with increasing butyl acrylate concentration in alcohol and systematically varies with the length of alcohol alkyl chain. Negative values of the excess inverse relaxation time found for all concentrations and at all temperatures studied may indicate that the effective dipoles rotate slowly.

Keywords: dielectric relaxation properties - time domain reflectometry - liquid—liquid mixtures - thermodynamic functions

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-007-0037-0

Chemical Papers 61 (4) 300–307 (2007)