Chemistry of Binary and Ternary Organic Eutectics

Abstract

Abstract With a view to elucidate the chemistry of binary and ternary organic eutectics, we measured phase diagrams, undercooling and linear velocity of crystallization of molten mixtures of α naphthol-m aminophenol, α naphthol-phenathrene, β naphthol-phenanthrene, β naphthol-m aminophenol, α naphthol-β naphthol-catechol, α naphthol-catechol-naphthalene, α naphthol-β naphthol-phenanthrene and α naphthol-β naphthol-m aminophenol systems. Microscopic studies and heat of fusion measurements were made to investigate the characteristics of the eutectics. The heats of fusion data do not obey the mixture law. The excess thermodynamic functions such as gE,hE and SE were also computed for the binary systems. Microscopic studies showed that freshly precipitated eutectics have different characteristics as compared to parent components. The growth rates are analyzed using the current theories of crystallization and a mechanism of growth has been proposed for the binary and ternary eutectics.