Chemistry and Characterization of Binary Organic Eutectics

Abstract

Phase diagrams of benzil with each of naphthalene, β-naphthol and p-chloronitrobenzene show the formation of simple eutectics. The growth velocity (v) data studied at different undercoolings (ΔT) by measuring the rate of movement of interface in a capillary obey the Hillig-Turnbull equation, v = u(ΔT)n, where u and n are constants depending on the nature of materials involved. Using enthalpy of fusion values, obtained by the DSC method, enthalpy of mixing, interfacial energy, entropy of fusion, excess thermodynamic functions and radius of the critical nucleus were calculated. Microstructural investigations give characteristic features of the eutectics.