Volumes of mixing and theP
* effect: Part II. Mixtures of alkanes with liquids of different internal pressures |
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Authors: | Miguel Costas Donald Patterson |
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Institution: | (1) McGill University, Otto Maass Chemistry Building, Montreal, Quebec |
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Abstract: | The Flory theory of solution thermodynamics is used to predict exess volumes for systems containing a series of n-alkanes mixed with liquids of higher P* parameter and internal pressure, i.e., cyclopentane, cyclohexane, carbon tetrachloride, benzene and dioxane as well as of lower P*, i.e., decamethyltetrasiloxane. Trends of V
E
, e.g. changes of sign with alkane carbon number are well predicted and indicate the importance of the P* contribution in V
E
. Mixtures of hexane isomers with liquids of much higher P* typically have large excess enthalpies through zero as an S-shaped curve against composition which is negative on the side of the high P* component. This behaviour is interpreted as arising from increasingly large negative P* contributions in V
E
. |
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Keywords: | Excess volume Prigogine Flory internal pressure normal alkanes hexane isomers cycloalkanes dioxane |
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