Effect of temperature and solvents on ultrasonic velocity and thermodynamic parameters of cyclohexane-1,1-diylbis(2-methyl-4,1-phenylene)dibenzoate solutions
| Main Authors: | Chirag Patel, Dhaduk Bhavin, P. H. Parsania |
|---|---|
| Format: | Article Journal |
| Bahasa: | eng |
| Terbitan: |
, 2015
|
| Subjects: | |
| Online Access: |
https://zenodo.org/record/5701757 |
Daftar Isi:
- Polymer Chemistry Division, Department of Chemistry, Saurashtra University, Rajkot-360 005, Gujarat, India E-mail : patel87chirag@gmail.com, dhaduk.bhavin@ymail.com, phparsania22@gmail.com, phparsania@aol.com Fax : 91-281-25777633 Manuscript received online 12 November 2014, accepted 13 January 2015 The present work describes physico-chemical parameters of cyclohexane-1,1-diylbis(2-methy l-4,1- phenylene)dibenzoate (MBCBZ). The density (ρ), viscosity (ɳ) and ultrasonic speed (U) of pure solvents : 1,4-dioxane (DO), chloroform (CF), ethyl acetate (EA), tetrahydrofuran (THF) and MBCBZ solutions of different concentrations were investigated at four different temperatures : 298, 303, 308 and 313 K to understand the effect of solvents on molecular interactions. Various acoustical and thermodynamic parameters such as ultrasonic speed (U), adiabatic compressibility (κs ), Rao’s molar sound function (Rm), specific acoustical impedance (Z), van der Waals constant (b), internal pressure (π), viscous relaxation time ( τ), free volume (Vf ), intermolecular free path length (Lf ) and classical absorption coefficient (α/f2 )cl have been determined and correlated with concentration (C). A fairly good to excellent correlation between a given parameter and concentration is observed. Studied acoustical and thermodynamic parameters indicated existence of strong molecular interactions in the solutions. Gibb’s free energy of activation (ΔG*) is found to be both concentration and temperature dependent. Both enthalpy of activation (ΔH*) and entropy of activation (ΔS*) are found to be concentration dependent.