TY - JOUR
T1 - Thermodynamic aspects of the glass transition in liquids and plastic crystals
AU - Angell, Charles
N1 - Funding Information:
The assistance of Hemlata Senapati in assembling and analyzing data for organic liquids, and in providing new experimental data for trialpha naphthyl benzene and squalane, is gratefully acknowledged. This work has been supported by the National Science Foundation under solid State Chemistry Grant No. DMR8744945.
PY - 1991/1/1
Y1 - 1991/1/1
N2 - We outline the basic phenomena characterizing the glass transition, highlighting the intimate association of thermodynamic changes and relaxation times, and the limits set by the Kauzmann entropy crises. The relation between the Kauzmann temperature and the glass transition temperature is examined in relation to the strong and fragile classification of liquids, and a consistency between the parameters of the normalized Vogel-Fulcher equation and the purely thermodynamic Kauzmann temperature is demonstrated. The separate roles of kinetic and thermodynamic factors in establishing the strong and fragile pattern are analyzed and the apparently anomalous position of the alcohols in the scheme is accounted for in these terms. Finally, the different types of excess heat capacity functions observed in different classes of glasses are reviewed, and some correlations with molecular structure are attempted.
AB - We outline the basic phenomena characterizing the glass transition, highlighting the intimate association of thermodynamic changes and relaxation times, and the limits set by the Kauzmann entropy crises. The relation between the Kauzmann temperature and the glass transition temperature is examined in relation to the strong and fragile classification of liquids, and a consistency between the parameters of the normalized Vogel-Fulcher equation and the purely thermodynamic Kauzmann temperature is demonstrated. The separate roles of kinetic and thermodynamic factors in establishing the strong and fragile pattern are analyzed and the apparently anomalous position of the alcohols in the scheme is accounted for in these terms. Finally, the different types of excess heat capacity functions observed in different classes of glasses are reviewed, and some correlations with molecular structure are attempted.
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U2 - 10.1351/pac199163101387
DO - 10.1351/pac199163101387
M3 - Article
AN - SCOPUS:0040007032
SN - 0033-4545
VL - 63
SP - 1387
EP - 1392
JO - Pure and Applied Chemistry
JF - Pure and Applied Chemistry
IS - 10
ER -