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

The contributions of the methylene group to the standard free energy, entha lpy and entropy of solution were measured on SE-30 and Carbowax-20M capilla ry columns. The slight decrease of the absolute value of the free energy in crement with the carbon number of the homologues has been confirmed for dif ferent temperatures and columns. The absolute values of all increments decr ease with temperature, and for Carbowax-20M depend on the film thickness. T here is a linear enthalpy-entropy correlation in a series of data measured at different mean temperatures of the range. A short review is included. (C ) 1999 Elsevier Science B.V. All rights reserved.