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Heat capacities and volumes of transfer of cholesteryl oleyl carbonate into various solvents

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Abstract

Heat capacities ΔC p and volumes ΔV have been obtained at 25°C for the transfer of cholesteryl oleyl carbonate (ChOC) from a reference solvent, the highly-branched alkane 2,2,4,4,6,8,8-heptamethylnonane into various solvents. These include normal, branched, and cyclic alkanes as well as the pure cholesteric ChOC. ΔV and most ΔC p are associated with the change of environmental free volume during the transfer process and are predicted by the Prigogine-Flory theory. However, for n-alkane solvents with more than twelve carbons, ΔC p is large, positive, and unattributable to free volume changes. It is consistent with a restriction of alkane segmental motion by the ChOC. The same mechanism has been proposed to explain an antiplasticization effect of ChOC on transitions in polymers.

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Author notes

  1. D. D. Deshpande

    Present address: Department of Chemistry, Indian Institute of Technology, Powai, Bombay, India

Authors and Affiliations

  1. Otto Maass Chemistry Building, McGill University, 801, Sherbrooke Street West, H3A 2K6, Montreal, Quebec, Canada

    D. D. Deshpande & D. Patterson

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  1. D. D. Deshpande
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  2. D. Patterson
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Deshpande, D.D., Patterson, D. Heat capacities and volumes of transfer of cholesteryl oleyl carbonate into various solvents. J Solution Chem 15, 969–976 (1986). https://doi.org/10.1007/BF00645192

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  • DOI: https://doi.org/10.1007/BF00645192

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