Journal ArticleDOI
Heat Capacity and Thermodynamic Properties of o‐Terphenyl Crystal, Glass, and Liquid
S. S. Chang,A. B. Bestul +1 more
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In this article, the authors measured the heat capacity of oterphenyl with an adiabatic calorimeter for the crystal from 2°K to Tm (329.35°K) and for the liquid from Tg to 360°K, on a sample with less than 0.005 mole % impurity.Abstract:
The heat capacity of o‐terphenyl has been measured with an adiabatic calorimeter for the crystal from 2°K to Tm (329.35°K), for the glasses from 2°K to Tg (around 240°K) and for the liquid from Tg to 360°K, on a sample with less than 0.005 mole % impurity. The heat of fusion and the entropy of fusion are 17 191 J mole−1 and 52.20 J°K−1· mole−1, respectively. The residual entropy of the glasses at 0°K is about 15 J°K−1· mole−1. Above 170°K, the heat capacity of the o‐terphenyl crystal is nearly proportional to the temperature to within 1%. Configurational entropy of the supercooled liquid, estimated from the result of this investigation, is used to relate the relaxation properties of glass‐forming liquids according to the theory of Adam and Gibbs. Good agreement is found for both viscosity and NMR correlation frequency data.read more
Citations
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Liquid-glass transition, a free-volume approach
Morrel H. Cohen,Gary S. Grest +1 more
TL;DR: In this paper, a theory of the underlying metastable phase, the amorphous phase, is developed, which is useful for describing the behavior of the viscosity of dense liquids and glasses.
Journal ArticleDOI
Reference materials for calorimetry and differential thermal analysis
TL;DR: The reference materials for calorimetry and differential thermal analysis as discussed by the authors are applicable to a wide range of scientific and technological research fields involving physical, chemical, and biological processes, and they can be found in the ICTAC working group "thermochemistry" during 1997-1998.
Journal ArticleDOI
Models of the glass transition
TL;DR: A general survey of glass transition phenomena and concepts is presented in an introductory section as discussed by the authors, and the physical significance of computer simulations of glass transitions in simple liquids and the question of a hidden phase transition underlying an observed glass transition are examined critically.
Journal ArticleDOI
The melting behavior of organic materials confined in porous solids
TL;DR: In this paper, the authors measured the solid-liquid phase transition temperatures and heats of fusion ΔH f of nonpolar organic solids confined in the pores of controlled pore glasses by differential scanning calorimetry.
Journal ArticleDOI
Dynamics of glass-forming liquids. V. On the link between molecular dynamics and configurational entropy
Ranko Richert,Charles Angell +1 more
TL;DR: In this paper, the authors compare dielectric relaxation τ(T) data of several low molecular weight glass-forming liquids with the predictions of the Adam-Gibbs theory using experimental data for the configurational entropy Sc(T).
References
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Journal ArticleDOI
The Temperature Dependence of Relaxation Mechanisms in Amorphous Polymers and Other Glass-Forming Liquids
Journal ArticleDOI
On the Temperature Dependence of Cooperative Relaxation Properties in Glass‐Forming Liquids
Gerold Adam,Julian H. Gibbs +1 more
TL;DR: In this paper, a molecularkinetic theory was proposed to explain the temperature dependence of relaxation behavior in glass-forming liquids in terms of the temperature variation of the size of the cooperatively rearranging region.
Journal ArticleDOI
Calorimetric Study of the Glassy State. IV. Heat Capacities of Glassy Water and Cubic Ice
TL;DR: In this paper, the glass transition phenomenon was found near 135°K with the sudden change of the heat capacity amounting to 35 J/(mol°K) and the drastic crystallization with the exothermic effect which amounts to 1.64 kJ/mol was then followed at this temperature.
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Study of the change in specific heat of monomeric and polymeric glasses during the glass transition
Journal ArticleDOI
Glass Transition in o‐Terphenyl
R. J. Greet,D. Turnbull +1 more
TL;DR: In this paper, it was shown that oterphenyl undergoes a glass transition in the vicinity of −30°C, which is about 60°C higher than that predicted by correlations applicable to simple molecular glass formers and the viscosity of the undercooled liquid was measured over the temperature range 20° to −16°C.
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