On the Glass Transition Phenomenon of Isopentane
- 1 March 1968
- journal article
- Published by Oxford University Press (OUP) in Bulletin of the Chemical Society of Japan
- Vol. 41 (3) , 593-600
- https://doi.org/10.1246/bcsj.41.593
Abstract
Heat capacity measurement of isopentane was carried out for crystalline, liquid, glassy, and supercooled liquid states in the temperature region between 13 and 300°K. The glass transition phenomenon of isopentane was found around 65°K with drastic heat capacity change of 68.20 J/mol degK. This glass transition phenomenon is tentatively interpreted in terms of the Adam and Gibbs theory. The value of Tg⁄T2, the ratio of glass transition temperature Tg, and the temperature of disappearance of the configurational entropy of the supercooled liquid T2, for isopentane was found to be 1.30 which is concordant with the value cited by Adam and Gibbs. The residual entropy at absolute zero of the glassy isopentane was shown to be 14.06 J/mol degK. In addition the irreversible production of entropy during the glass transition intervals was found to be 0.08 J/mol degK. It is concluded that the neglect of the irreversible production of entropy leads no significant error in determing the residual entropy.This publication has 14 references indexed in Scilit:
- On the Temperature Dependence of Cooperative Relaxation Properties in Glass-Forming LiquidsThe Journal of Chemical Physics, 1965
- An Automatic Adiabatic Calorimeter for Low Temperatures. The Heat Capacity of Standard Benzoic AcidBulletin of the Chemical Society of Japan, 1965
- Some Thermodynamic Aspects of the Glass Transition: Free Volume, Entropy, and Enthalpy TheoriesThe Journal of Chemical Physics, 1963
- Concerning Reconstructive Transformation and Formation of GlassThe Journal of Chemical Physics, 1958
- Ultrasonic Studies of Saturated Hydrocarbons at Low TemperaturesThe Journal of Chemical Physics, 1956
- The irreversible approach to equilibrium in glassesProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1953
- Thermal Data. XVI. The Heat Capacity and Entropy of Isopentane. The Absence of a Reported AnomalyJournal of the American Chemical Society, 1943
- The Heat Capacity and Entropy, Heats of Fusion and Vaporization and the Vapor Pressures of IsopentaneJournal of the American Chemical Society, 1942
- THERMAL DATA ON ORGANIC COMPOUNDS. VI. THE HEAT CAPACITIES, ENTROPIES AND FREE ENERGIES OF SOME SATURATED, NON-BENZENOID HYDROCARBONS1Journal of the American Chemical Society, 1930
- THE THIRD LAW OF THERMODYNAMICS. EVIDENCE FROM THE SPECIFIC HEATS OF GLYCEROL THAT THE ENTROPY OF A GLASS EXCEEDS THAT OF A CRYSTAL AT THE ABSOLUTE ZEROJournal of the American Chemical Society, 1923