Dielectric Relaxation Studies of Alkyl Methacrylate–Phenol Mixtures by Time Domain Reflectometry
Dielectric relaxation studies of alkyl methacrylate (methyl methacrylate, ethyl methacrylate and butyl methacrylate) mixtures with phenol derivatives (p-cresol, p-chlorophenol and 2,4-dichlorophenol) have been carried out using a time domain reflectometry (TDR) technique in the frequency range 10MHzto 20 GHz at 293 K. Static permittivities (εo), relative permittivities at high frequency (ε∞) and relaxation times (τ) were found through dielectric measurements for different concentrations of each system. The Kirkwood correlation factor and the excess inverse relaxation time were determined and they yield information on the molecular interactions occurring in the systems. The values of the static permittivity and the relaxation time increase with an increase in the percentage of phenol in the mixtures.
KEYWORDS: Dielectric relaxation, time domain reflectometry, phenol derivatives, alkyl methacrylates.