Dielectric relaxation studies. II. Phenolic Mannich bases in dilute solution

摘要

The dielectric relaxation processes in phenolic Mannich bases have been investigated by measuring the dielectric permittivity and loss in dilute solutions of benzene at three different microwave frequencies at 30deg;, 45deg;, and 60thinsp;deg;C. Results are analyzed in terms of Colendash;Cole arc plots and two distinct relaxation times. The results establish the intramolecular hydrogen bonding of the ndash;OH group. The overall molecular relaxation appears to be the predominant mechanism in these substituted phenols. Activation parameters have been calculated assuming dielectric relaxation to be an Eyringhyphen;type rate process.