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- W2040432960 abstract "Abstract The GLC method of measurement of activity coefficients γ∞A Liquid-gas partition coefficients KR ο specific retention volumes Vg ο, capacity factors k', and excess thermodynamic properties of mixing of solutes at effective infinite dilution in polymeric solvents is considered. It is argued that while van't Hoff plots of any of the retention parameters can reveal subtle phase transitions exhibited by the solvent (the solutes are used as probes of the state of polymer aggregation), it is impractical to make measurements of most of these variables from the standpoints of both theory and experiment. A new method of characterizing the behavior of probe-solutes with polymeric solvents that is based upon evaluation of the slopes of family plots of log Vg ο against log PA ο is therefore described; where Pg ο is the solute vapor pressure at the column temperature. The ideal slope of such plots is -1, deviations from this value being a measure of departure from solution ideality. Results obtained for plots of the readily-accessible parameter log k’ (rather than log Vg ο) for a range of aromatic hydrocarbon solutes are then presented that give discontinuities with mesomorphic polysiloxane (MEPSIL) solvents, two representative examples of which are presented and discussed. The new technique is also said to have advantage as a means of gauging the utility of MEPSIL solvents as analytical gas-chromatographic stationary phases and, in addition, suggests an attractively simple method for the physicochemical measurement of vapor pressures and heats of vaporization." @default.
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- W2040432960 date "1988-04-01" @default.
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- W2040432960 title "Probe-Solute Study of Mesomorphic Polysiloxane (Mepsil) Solvents. Discontinuities in Family Retention Plots That Traverse Phase Transitions" @default.
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- W2040432960 doi "https://doi.org/10.1080/00268948808080244" @default.
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