Molecular association of alkyl methacrylates and alcohols in non-polar solvents: Dielectric study

Dielectric Relaxation Studies of Primary Alcohols and Alkyl Methacrylates

Dielectric relaxation studies of alkyl (methyl, ethyl, and butyl) methacrylates with primary alcohols (1-propanol, 1-pentanol, 1-heptanol, and 1-octanol) at 9.84 GHz have been studied in benzene at 298 K. The results show that the most likely association between alcohol and ester is 1 : 1 complex through the free hydroxyl group of the alcohol and the carbonyl group of ester and the alkyl chain-length of both the alcohols and esters plays an important role in the determination of the strength of hydrogen bond (O–H:O=C) formed. Comparative study of free energy of activation for the dielectric relaxation and viscous flow suggest the fact that the process of viscous flow involves greater interference by neighbors than does dielectric relaxation, as the latter takes place by rotation only whereas the viscous flow involves both the rotational and translational forms of motion.

Molecular interactions in alcohol-ethyl methacrylate mixtures

Molecular interaction between alcohols (1-propanol, 1-butanol, s-butanol, t-butanol, 1-pentanol, 1-heptanol, 1-octanol and 1-decanol) with ethyl methacrylate has been studied in n-heptane, CCl(4) and benzene at 298K using FTIR spectroscopic and dielectric methods. The result obtained from both the methods indicates only the existence of most likely 1:1 complex formation between the alcohol and ethyl methacrylate in these systems. The alkyl chain length of alcohol and the solvent used play a significant role in the strength of hydrogen bond (O-H:O=C) determined on the basis of spectral and dielectric parameters.

Dielectric relaxation of butyl acrylate—alcohol mixtures using time domain reflectometry

Dielectric relaxation measurements of butyl acrylate—alcohol mixtures at different concentrations and temperatures within the frequency range of 10 MHz to 10 GHz have been carried out using time domain reflectometry. Parameters such as the static permittivity, dielectric relaxation time, the Kirkwood correlation factor, the excess inverse relaxation time, and thermodynamic functions were determined and discussed to yield information on the molecular structure and dynamics of the mixture. The value of the dielectric properties decreases with increasing butyl acrylate concentration in alcohol and systematically varies with the length of alcohol alkyl chain. Negative values of the excess inverse relaxation time found for all concentrations and at all temperatures studied may indicate that the effective dipoles rotate slowly.