Abstract
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 30°, 45°, and 60 °C. Results are analyzed in terms of Cole–Cole arc plots and two distinct relaxation times. The results establish the intramolecular hydrogen bonding of the –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 Eyring‐type rate process.
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