Dielectric characterization and thermodynamic analysis of iso-propyl acetate and Iso-amyl acetate with dimethyl sulphoxide binary mixtures using time domain reflectometry

• Investigated the dielectric properties and molecular interactions of isopropyl acetate (IPAc) and isoamyl acetate (IAA) with dimethyl sulfoxide (DMSO) binary mixtures using Time Domain Reflectometry (TDR) over 10 MHz–30 GHz. • Determined static dielectric constant (ε₀) and relaxation time (τ) by fitting complex permittivity spectra to the Cole–Davidson model with least squares fitting. • Evaluated molecular interactions and dielectric relaxation through Bruggeman factor, Kirkwood correlation factor, excess permittivity, and thermodynamic parameters. • Revealed structural differences and molecular interactions influenced by chain length and concentration, providing insights into dipole orientation and mixture behavior.