Modern practice of gas chromatography by Grob R

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V. Schulz, Z. Physik. , 1935, B30, 379. P. J. Flory, J. Am. Chem. , 1936, 58, 1877. W. H. Carothers, US Patent 2 130 948, 1937. E. W. Fawcett, R. O. Gibson, J. Chem. , 1934, 386. K. G. Denbigh, Trans. , 1947, 43, 648. K. Ziegler, E. Holzkamp, H. Breil, H. Martin, Angew. , 1955, 67, 541. P. W. Morgan, S. L. Kwolek, Macromolecules, 1975, 8, 104. H. Sasabe, T. Wada, Polymers for electronic applications, in: Comprehensive Polymer Science, vol. 7, S. L. ), Pergamon Press, Oxford, 1989. J. K. J. van Duren, J.

2), which is characterized by the occurrence of a lower critical solution temperature (LCST) [9]. This phenomenon can not be explained on the basis of the original Flory–Huggins theory. Delmas and Patterson [10] calculated binary critical curves of polymer–solvent systems using the Flory equation of state [11, 12]. According to these authors the reason for the occurrence of this LCST is the large difference in thermal expansion of pure liquid polymer and pure solvent, which leads to an increasing difference in free volume with increasing temperature and an LCST-type liquid–liquid phase split at temperatures below the critical point of the solvent.

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