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Thermal study of glass transitions in binary systems of simple hydrocarbons

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Abstract

Glass transition phenomena of four binary systems composed of simple hydrocarbons were studied by means of the differential thermal analysis (DTA). For all the systems, a definite glass transition was observed and a monotonous relation between the glass transition temperature (T g) and composition (x) was obtained. The composition dependence ofT g was analyzed in terms of the entropy theory based on the regular solution model. The theoretical prediction could not reproduce our results other than (1-butene)x(1-pentene)1−x system. This disagreement is considered to be due to deviations of the present systems from the regular solution, and the accompanying excess configurational entropy Sc E was estimated as a function of composition. Extraordinarily large values of S Ec ? were obtained for (propene)x(propane)1−x and (propene)inx(1-pentene)1−x systems.

Zusammenfassung

Mittels DTA wurden Glasumwandlungserscheinungen von vier binären Systemen aus einfachen Kohlenwasserstoffen untersucht. Für alle Systeme wurde eine definitive Glasumwandlung beobachtet, wobei man eine monotone Beziehung zwischen der Glasumwandlungstemperatur (T g) und der Zusammensetzung (x) erhielt. Die Konzentrationsabhängigkeit vonT g wurde hinsichtlich der Entropietheorie auf der Grundlage des regulären Lösungsmodelles analysiert. Die Prognose konnte die Resultate nicht reproduzieren, nur das System (1-Buten)x(1-Penten)1−x. Diese Diskrepanz wird mit der Abweichung der Systeme von einer regulären Lösung erklärt und die zusätzliche Konfigurationsentropie Sc E wurde als Funktion der Konzentration geschätzt. Außerordentlich hohe Werte für 5c E wurden bei den Systemen (Propen)x(Propan)1−x und (Propen)x(Penten)1−x erhalten.

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Author notes

  1. K. Takeda

    Present address: Naruto University of Education, Takashima, Naruto-cho, Naruto-shi, 772, Tokushima, Japan

Authors and Affiliations

  1. Department of Chemistry and Microcalorimetry Research Center, Faculty of Science, Osaka University, Toyonaka, 560, Osaka, Japan

    K. Takeda, O. Yamamuro & H. Suga

Authors
  1. K. Takeda
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  2. O. Yamamuro
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  3. H. Suga
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Contribution No. 54 from the Microcalorimetry Research Center

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Takeda, K., Yamamuro, O. & Suga, H. Thermal study of glass transitions in binary systems of simple hydrocarbons. Journal of Thermal Analysis 38, 1847–1860 (1992). https://doi.org/10.1007/BF01974679

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