Physical Chemistry of Organic Eutectics

Author： Rai U.   Rai R.  

Publisher： Springer Publishing Company

ISSN： 1388-6150

Source： Journal of Thermal Analysis and Calorimetry, Vol.53, Iss.3, 1998-09, pp. : 883-893

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Abstract

Phase diagrams of urea-α-naphthol and urea-benzoic acid systems, determined by the thaw-melt method, show the formation of simple eutectic in each case. The growth velocity data, determined at different undercooling (∆T) by observing the rate of movement of interface in a capillary, obey the Hillig-Turnbull equation, v=u(∆T)n, where u and n are constants depending on the nature of the materials. Using enthalpy of fusion, undercooling (∆T) and melting point data, entropy of fusion, interfacial energy, enthalpy of mixing, critical radius size and excess thermodynamic functions were calculated. The microstructural investigations give characteristic features of the eutectics.

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