Relaxation phenomena of acrylic esters and phenols in dilute solution of CCl₄ under static and high frequency electric field

Double relaxation times τ₂ and τ₁ due to whole molecular rotation and the flexible parts of the binary (jk) polar mixture of p-cresol, p-chlorophenol, 2,4 dichlorophenol and p-bromophenol with methyl methacrylate (MMA) or ethyl methacrylate (EMA) were estimated under 9.37 GHZ electric field dissolved in dilute CCl₄ solution at 35°C using high frequency susceptibility data χ_ijk's for different weight fractions w_jk's. Six systems out of eight exhibit τ₂, τ₁; c₂, c₁ and μ₂, μ₁, respectively. The estimatedτ₂'s and μ₂'s agree well with the measured and reported values indicating the whole rotation of binary polar mixture under high frequency electric field. Solute-solute and solute-solvent molecular formation through H-bonding are ascertained from μ_av – x_j curves for 0.5 mole fraction x_j of acrylic ester. The associational aspects are taken into consideration in μ_theo from the stand point of inductive, mesomeric and electromeric effects within the polar groups of the molecules. Static μ₀'s are calculated and compared with the reported values also. (author)