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Title: Phase equilibria and fractionation in polymer solutions
Author: Myrat, Constantine Demetrius
Awarding Body: University of London
Current Institution: Imperial College London
Date of Award: 1965
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This thesis has been divided into three sections. The first section deals with the phase equilibria studies. A polymer solution when heated to a temperature well above the normal boiling point but below the gas-liquid critical point of the solvent separates into two liquid phases. This consolute temperature is shown to depend upon the concentration, the mean molecular weight of the polymer and the distribution about the mean as well as upon the dissimilarity of polymer and solvent. The hydrostatic pressure also affects these lower consolute temperatures in a more pronounced way than the upper consolute temperatures. For an increase of 2 atm the consolute temperature rises about 1°C. The wide separation of the temperature, concentration curves for samples of different molecular weight suggests that there is some fractionation of the polymer between the two phases. In the second section an apparatus is described where the phases are removed under pressure and the efficiency of fractionation determined. The pressure, consolute temperature measurements were carried out in this fractionation apparatus which was then modified in order to measure the compressibility of the system and thus determine the voltime of the solution at phase separation and the volume of mixing. Section three contains the discussion of the lower consolute temperature phenomena and the results derived from the present investigation.
Supervisor: Rowlinson, J. S. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available