THE NEMATIC-ISOTROPIC TRANSITION AT HIGH PRESSURES I : THE P-V-T EQUATION OF STATEReportar como inadecuado




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Abstract : We report the results of high pressure thermodynamic measurements on three nematics and one cholesteric in the vicinities of their clearing transitions. We focus in particular on the variation with temperature of the volume discontinuity, compressibility, and transition density. Significant correlations are found between the variations of these parameters with temperature and the degree of end chain flexibility present in each molecule. These trends are shown to be in agreement with the results of theoretical calculations for semiflexible molecules. The variation of the transition density can be accounted for by involving repulsive forces only.





Autor: P. Keyes W. Daniels

Fuente: https://hal.archives-ouvertes.fr/



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