Studies on Glass. XI. Some Thermodynamic Relations of Glassy and Alpha-Crystalline Glucose

被引：44

作者：

Parks, George S. ^{[1
]}

Snyder, Loilor J. ^{[1
]}

Cattoir, Francis R. ^{[1
]}

机构：

[1] Stanford Univ, Dept Chem, Stanford, CA 94305 USA

来源：

JOURNAL OF CHEMICAL PHYSICS | 1934年 / 2卷 / 09期

关键词：

D O I：

10.1063/1.1749540

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Although the properties of a glass depend to some extent upon its thermal history, the view is expressed that fairly satisfactory thermodynamic data can be obtained for well-annealed glasses. In the present study the difference between the heat contents of glucose glass and alpha-crystals has been determined calorimetrically at 20 degrees C and with the aid of this result the corresponding differences in entropy and free energy have also been computed. The value for this last quantity is Delta F-293(o)=1670 cal. per mol. Solubility measurements have been made for glucose alpha-crystals and glass in methyl, ethyl and isopropyl alcohols at 20 degrees. The free energy values thereby obtained for the conversion of alpha-crystals into glassy glucose are in good agreement with the preceding value derived from the thermal data.

引用

页数：4