DOI: 10.1246/bcsj.46.3020. Calorimetric Study of the Glassy State. VIII. Heat Capacity and Relaxational Phenomena of Isopropylbenzene

Calorimetric Study of the Glassy State. VIII. Heat Capacity and Relaxational Phenomena of Isopropylbenzene

10.1246/bcsj.46.3020

Crossref journal-article

Oxford University Press (OUP)

Bulletin of the Chemical Society of Japan (286)

Abstract

Abstract The heat capacities of isopropylbenzene were measured with an adiabatic calorimeter for the crystal from 14 to 177.13 K (Tm), for the glassy state from 14 to around 126 K (glass transition temperature: Tg) and for the liquid from Tg to 313 K, with a sample of 99.93% purity. The heat and entropy of fusion were found to be 7326 J mol−1 and 41.36 J K−1 mol−1, respectively. Based on these data, a set of thermodynamic functions are tabulated at rounded temperatures. In addition to the primary glass transition phenomenon, a secondary enthalpy relaxation as well as a step-like heat capacity anomaly was observed at around 70 K. These facts were discussed in correlation with the β-relaxation already observed by dielectric measurement. Gonfigurational entropies of the supercooled liquid and of the glassy state were calculated to investigate a relation with relaxational properties. The agreement is found between the temperatures where catastrophe occurs in viscosity (T0), and where the configurational entropy vanishes (T2). Finally, a kind of heat capacity break observed in the liquid state is discussed against the view that this behavior is compatible with a third-order thermodynamic transition.

Bibliography

Kishimoto, K., Suga, H., & Seki, S. (1973). Calorimetric Study of the Glassy State. VIII. Heat Capacity and Relaxational Phenomena of Isopropylbenzene. Bulletin of the Chemical Society of Japan, 46(10), 3020â3031.

Authors 3

Koji Kishimoto (first)
Hiroshi Suga (additional)
Syûzô Seki (additional)

References 40 Referenced 87

Dates

Type	When
Created	19 years, 1 month ago (July 19, 2006, 10:06 p.m.)
Deposited	1 year, 7 months ago (Jan. 17, 2024, 1:28 p.m.)
Indexed	1 month, 1 week ago (July 23, 2025, 9 a.m.)
Issued	51 years, 11 months ago (Oct. 1, 1973)
Published	51 years, 11 months ago (Oct. 1, 1973)
Published Online	19 years, 5 months ago (March 27, 2006)
Published Print	51 years, 11 months ago (Oct. 1, 1973)

Funders 0

None

BibTeX

@article{Kishimoto_1973, title={Calorimetric Study of the Glassy State. VIII. Heat Capacity and Relaxational Phenomena of Isopropylbenzene}, volume={46}, ISSN={1348-0634}, url={http://dx.doi.org/10.1246/bcsj.46.3020}, DOI={10.1246/bcsj.46.3020}, number={10}, journal={Bulletin of the Chemical Society of Japan}, publisher={Oxford University Press (OUP)}, author={Kishimoto, Koji and Suga, Hiroshi and Seki, Syûzô}, year={1973}, month=oct, pages={3020–3031} }

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