ISSN (e): 2250 – 3005 || Volume, 08 || Issue, 9|| Sepetember – 2018 || International Journal of Computational Engineering Research (IJCER) www.ijceronline.com Open Access Journal Page 56 Dielectric Relaxation And Molecular Interactions Study Of Glymes In Aqueous Solutions Using TDR Technique J B Shinde 1 , K S Kanse 1 , D N Rander 1 , Y S Joshi 2* , A C Kumbharkhane 3 1 Department of Physics, Lal Bahadur Shastri Mahavidyalaya, Dharmabad Dist. Nanded, MS, India 2 Department of Electronics, Lal Bahadur Shastri Mahavidyalaya, Dharmabad Dist. Nanded, MS, India 3 School of Physical Sciences, Swami Ramanand Teerth Marathwada University, Nanded, MS, India Corresponding Author: J B Shinde --------------------------------------------------------------------------------------------------------------------------------------- Date of Submission: 01-10-2018 Date of acceptance: 13-10-2018 --------------------------------------------------------------------------------------------------------------------------------------- I. INTRODUCTION: Glymes viz. ethylene glycol dimethyl ether (EGDME) and diethylene glycol dimethyl ether (DEGDME) are saturated non-cyclic polyethers without any other functional group. These are completely miscible in water [1]. The chemical composition of EGDME (monoglyme) is C 4 H 10 O 2 and that of DEGDME (diglyme) is C 6 H 14 O 3 . Glymes are usually stable, less toxic, environment caring than general laboratory solvents and have both hydrophilic and hydrophobic characters. Glymes have wide applications in laboratory such as organic synthesis, electrochemistry, biocatalysis, materials, Chemical Vapor Deposition (CVD) and industrial applications such as cleaning products, inks, adhesives, coatings, batteries, electronics, absorption refrigeration, heat pumps as well as pharmaceutical formulations etc [1]. Water is a strong hydrogen bonding liquid which shows highly cooperative phenomenon [2]. Therefore, the dielectric relaxation study of glymes in aqueous solutions will be interesting and useful in various applications. In literature, there is a little experimental data available regarding dielectric properties of glymes [1-6]. Iglesias et.al. have measured the permittivities and densities of glymes with n-heptane. In which, excess permittivity and its behavior with temperature and that of excess molar volume were discussed in detail [3]. Buchner et. al. studied the excess molar volumes over the whole composition range of open-chain and cyclic ethylene glycol ethers in aqueous solutions [2]. Smith et. al. extensively studied conformational, translational, rotational dynamics and thermodynamic properties of glymes in aqueous solutions through molecular dynamics simulations [7-11]. The study reveals strong hydrogen bonding interactions of glymes in aqueous solutions. The dipole-dipole interactions among the glymes – water discussed in terms of hydrophilic and hydrophobic conformers. In our previous work, the dielectric dispersions of EGDME and DEGDME with aqueous solutions were studied at low frequency range of 20 Hz to 2 MHz using Precision LCR meter [6]. In this frequency range, it is not possible to explain the dielectric relaxation process of these binary mixtures. In order to study the relaxation process among the binary mixtures of EGDME and DEGDME with water, the dielectric measurements have been carried out in the high frequency range of 10 MHz to 30 GHz using time domain technique. The dielectric parameters are evaluated using non linear least square method. Molecular interactions among the EGDME, DEGDME with water molecules have been discussed using parameters such as Excess dielectric permittivity, Kirkwood correlation factor and Bruggeman Factor. ABSTRACT: The dielectric measurement of glymes viz. Ethylene glycol dimethyl ether (EGDME) and diethylene glycol dimethyl ether (DEGDME) in aqueous solutions have been carried out in the frequency range of 10 MHz to 30 GHz using time domain technique. The measurements have been done over whole composition range of glymes and water, at temperatures 25 °C, 15 °C and 5 °C. The dielectric parameters for these glymes – water mixture have been evaluated using non linear least square method. Molecular interactions among the EGDME, DEGDME with water molecules have been discussed using parameters such as Excess dielectric permittivity, Kirkwood correlation factor and Bruggeman Factor. Keywords: TDR, Glymes, Excess dielectric permittivity, Kirkwood correlation factor, Bruggeman factor.