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

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概要

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• The heat capacities of isopropylbenzene were measured with an adiabatic calorimeter for the crystal from 14 to 177.13 K (<I>T</I><SUB>m</SUB>), for the glassy state from 14 to around 126 K (glass transition temperature: <I>T</I><SUB>g</SUB>) and for the liquid from <I>T</I><SUB>g</SUB> to 313 K, with a sample of 99.93% purity. The heat and entropy of fusion were found to be 7326 J mol<SUP>−1</SUP> and 41.36 J K<SUP>−1</SUP> mol<SUP>−1</SUP>, 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 (<I>T</I><SUB>0</SUB>), and where the configurational entropy vanishes (<I>T</I><SUB>2</SUB>). 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.

• 公益社団法人 日本化学会の論文

著者

• Kishimoto Koji

  Department Of Oral And Maxillofacial Surgery Biopathological Science Okayama University Graduate Sch

• Seki Syuzo

  Department Of Chemistry Faculity Of Science Osaka University

• Suga Hiroshi

  Department of Chemistry and Chemical Thermodynamics Laboratory, Faculty of Science, Osaka University

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