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Gas chromatographic determination of thermodynamic properties of polymer solutions at high pressure
Author(s) -
Brockmeier Norman F.,
Carlson Ronald E.,
McCoy Robert W.
Publication year - 1973
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690190609
Subject(s) - polymer , solubility , solvent , hexane , thermodynamics , chemistry , gas chromatography , range (aeronautics) , polyethylene , chromatography , activity coefficient , materials science , aqueous solution , organic chemistry , physics , composite material
The gas chromatographic (GC) method for thermodynamic measurements of polymer‐solvent systems at finite concentration has been improved to extend its operating range from atmospheric pressure to over 70 atm and over 240°C. This paper describes the design and opertion of the equipment and the mathematical treatment of the GC data, and presents experimental results for n ‐hexane and isooctane in high density polyethylene. These results include the solubility isotherms, activity coefficients, and polymer‐solvent interaction parameters. The activity coefficients covering a range from 4 to 70 atm for n ‐hexane in the polymer solution were correlated successfully as a function of composition using a two‐parameter segment interaction equation.