Phase Diagram and Growth Behaviour of Durene–resorcinol System |
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Authors: | Rai U S Pandey P |
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Institution: | (1) Chemistry Department, Banaras Hindu University, Varanasi, 221 005 (U. P.), India |
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Abstract: | Phase diagram of durene–resorcinol system, determined by the thaw-melt method, shows the formation of a monotectic (0.109
mole fraction of durene) and an eutectic (0.964 mole fraction of durene) with a large liquid miscibility gap in the region
from 0.109 to 0.964 mole fraction of durene. The eutectic, monotectic and consolute temperatures are 78.4, 107.8 and 165.0°C,
respectively. The growth behaviour studied by measuring the linear velocity of crystallization (v) in a capillary at different undercoolings (ΔT) suggests that the data obey the Hillig–Turnbull equation,v=u(ΔT)n, where u and n are constants depending on the nature of materials involved. From the values of enthalpy of fusion of the pure components,
the eutectic and the monotectic determined by the DSC method using Mettler DSC-4000 system, entropy of fusion, enthalpy of
mixing, Jackson’sroughness parameter, size of the critical nucleus interfacial energy and excess thermodynamic functions were
calculated. The microstructures of the eutectic, and the monotectic, determined by the Leitz Laborlux D optical microscope
show their characteristic features.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | growth kinetics organic monotectic phase-diagram thermochemistry |
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