Influence of temperature and n-alkane pair on the methylene increments to the thermodynamic functions of solution on SE-30 and Carbowax-20M capillary columns

Abstract

The contributions of the methylene group to the standard free energy, enthalpy and entropy of solution were measured on SE-30 and Carbowax-20M capillary columns. The slight decrease of the absolute value of the free energy increment with the carbon number of the homologues has been confirmed for different temperatures and columns. The absolute values of all increments decrease with temperature, and for Carbowax-20M depend on the film thickness. There is a linear enthalpy–entropy correlation in a series of data measured at different mean temperatures of the range. A short review is included.