Acoustical study on interaction of thymol-guanidine-formaldehyde copolymer resin with polar protic and aprotic solvents

The various proportions of Thymol-guanidine hydrochloride-formaldehyde copolymer resins have been synthesized by the condensation polymerization of reacting monomers i.e. thymol, guanidine hydrochloride and formaldehyde using microwave irradiation technique. The synthesized copolymer resins have bee...

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Bibliographic Details
Published in:Journal of molecular liquids 2016-10, Vol.222, p.225-232
Main Authors: Kukade, S.D., Singh, S.K., Naik, R.R., Bawankar, S.V.
Format: Article
Language:English
Subjects:
Copolymer resin
Guanidine
Solute-solvent interaction
Thymol
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Summary:The various proportions of Thymol-guanidine hydrochloride-formaldehyde copolymer resins have been synthesized by the condensation polymerization of reacting monomers i.e. thymol, guanidine hydrochloride and formaldehyde using microwave irradiation technique. The synthesized copolymer resins have been characterized by spectral methods viz. UV–visible, IR, 1H NMR and 13C NMR spectroscopy. The ultrasonic velocity, density and viscosity of these copolymer resins in different solvents at 303K have been measured. Based on the data obtained, various acoustical parameters like adiabatic compressibility, intermolecular free length, acoustic impedance, relaxation time and Gibb's free energy have been calculated. The result has been discussed on the basis of various types of solute-solvent interactions present between various ratios of copolymer resin with different solvent system. The increasing trends of ultrasonic velocity in different solvents is in the order: DMSO>DMF>1,4-dioxane>n-butyl alcohol>ethyl alcohol, which indicates the strong intermolecular interactions of synthesized copolymer resin with DMSO and 1,4-dioxane due to strong hydrogen bonding. [Display omitted] •Condensation polymerization of thymol-guanidine hydrochloride-formaldehyde.•TGF resins synthesized by microwave irradiation technique.•Ultrasonic velocity in different solvents: DMSO>DMF>1,4-dioxane>n-butanol>ethanol.•Strong intermolecular interactions of synthesized copolymer resin with DMSO.•Copolymer form stronger interaction in polar aprotic solvents than in polar protic.
ISSN:0167-7322
1873-3166
DOI:10.1016/j.molliq.2016.07.059