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Thermodynamics of mixing of ethylene oxide oligomers with different end groups in tetrachloromethane: theoretical treatment

✍ Scribed by Killmann, Erwin ;Cordt, Frank ;Möller, Friedrich

Publisher
Wiley (John Wiley & Sons)
Year
1992
Weight
394 KB
Volume
1
Category
Article
ISSN
1018-5054

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✦ Synopsis

Abstract

In a previous paper we reported the enthalpies of mixing of oligomers of ethylene oxide with different end groups in tetrachloromethane. This paper shows the applicability of the modified theoretical treatment, based on a quasichemical equilibrium of the contacting segmental surfaces originated from Huggins, to our experimental results. The experimental data of ethylene oxide oligomers with methoxy end groups can be described with the energy parameter Δε~αβ~, the equilibrium constant K~αβ~ and the surface ratio r~σ~ assuming a chemically uniform surface of the oligomer in CCI~4~. Ethylene oxides with strong polar OH end groups can be treated successfully with an extended version of the theory with two additional parameters K and ΔΔε for systems containing three different kinds of chemical units.

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Thermodynamics of mixing of propylene ox
Thermodynamics of mixing of propylene oxide oligomers with different end groups and of statistical and block cooligomers of ethylene oxide and propylene oxide in tetrachloromethane
✍ Erwin Killmann; Frank Cordt; Friedrich Möller; Helmut Zellner 📂 Article 📅 1995 🏛 John Wiley and Sons 🌐 English ⚖ 704 KB

Mixing enthalpies and Gibbs energies of liquid propylene oxide oligomers with hydroxyl and methoxy end groups and of block and statistical cooligomers of ethylene oxide and propylene oxide in tetrachloromethane are obtained by microcalorimetry and vapour pressure measurements. The thermodynamic exce