Thermodynamic Properties of Polyphenylquinoxaline in the Temperature Range of T → 0 to 570 K

The thermodynamic properties of amorphous polyphenylquinoxaline in the temperature range of 6 to 570 K are studied via precision adiabatic vacuum calorimetry and differential scanning calorimetry. The thermodynamic characteristics of glass transition are determined. Standard thermodynamic functions...

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Bibliographic Details
Published in:Russian Journal of Physical Chemistry A 2018-02, Vol.92 (2), p.226-231
Main Authors: Smirnova, N. N., Markin, A. V., Samosudova, Ya. S., Bykova, T. A., Shifrina, Z. B., Serkova, E. S., Kuchkina, N. V.
Format: Article
Language:English
Subjects:
Adiabatic flow
Chemical Thermodynamics and Thermochemistry
Chemistry
Chemistry and Materials Science
Entropy of formation
Fractals
Heat measurement
Physical Chemistry
Specific heat
Thermodynamic properties
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Summary:The thermodynamic properties of amorphous polyphenylquinoxaline in the temperature range of 6 to 570 K are studied via precision adiabatic vacuum calorimetry and differential scanning calorimetry. The thermodynamic characteristics of glass transition are determined. Standard thermodynamic functions C ° p , H °( T ) − H °(0), S °( Т ) − S °(0), and G °( T ) − H °(0) in the range of T → 0 to 570 K and the standard entropy of formation at T = 298.15 K are calculated. The low-temperature ( T ≤ 50 K) heat capacity is analyzed using a multifractal model for the processing of heat capacity, fractal dimension D values are determined, and conclusions on the topological structure of the compound are drawn.
ISSN:0036-0244
1531-863X
DOI:10.1134/S0036024418020206