Apparent molal volumes and adiabatic compressibilities of ethylene glycol derivatives in water at 5, 25, and 45°C |
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| Authors: | Shigeharu Harada Toshio Nakajima Tsuyoshi Komatsu Tsurutaro Nakagawa |
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| Institution: | (1) Department of Polymer Science, Faculty of Science, Hokkaido University, 060 Sapporo, Japan |
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| Abstract: | Density and ultrasonic velocity measurements were made on a series of dilute equeous solutions of H(OCH
2
CH
2
)nOH, CH
3
(OCH
2
CH
2
)nOCH
3
, H(CH
2
)nOCH
2
CH
2
OH (n=1–4), and poly(ethylene glycol) at 5, 25, and 45°C. The additivity of the limiting partial molal volumes (
) and adiabatic compressibilities (
) for CH
2
and CH
2
CH
2
O groups was tested by using the observed
and
values of the solutes. The
and
values of the CH
3
, CH
2
, CH
2
CH
2
O, and CH
2
OH groups were estimated and discussed in relation to hydration effects. The
and
values of alkoxyethanols calculated on the basis of the additivity of the group partial molal quantities were in good agreement with the observed values. The behavior of the limiting partial molal isothermal compressibility of alkoxyethanols was similar to that of the adiabatic compressibility. |
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| Keywords: | Apparent molal volume apparent molal adiabatic compressibility additivity ethylene glycol derivatives solute-solvent interactions isothermal compressibility |
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