0000000000929282

AUTHOR

Kurt Schotsch

showing 2 related works from this author

1984

An apparatus is presented for the precise measurement of vapour pressures. It is tested with diethyl ether and applied to the system tert-butyle acetate/polystyrene (weight-average molecular weight Mw = 110000) up to polymer concentrations of ca. 60 wt.-% in the temperature range from 10 to 90°C; by means of the Redlich-Kister equation the results can well be described analytically. The data are evaluated to yield the Flory-Huggins parameter in the subsequent article in conjunction with other experimental information.

chemistry.chemical_classificationchemistry.chemical_compoundtert-Butyl acetatechemistryYield (chemistry)Polymer chemistryPolystyrenePolymerDiethyl etherAtmospheric temperature rangeDie Makromolekulare Chemie
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1984

By means of data from critical demixing and vapour pressure measurements and by inverse gas chromatography, including the results of published light scattering measurments, a consistent picture is obtained for the entire dependence of the Flory-Huggins parameter χ on the weight fraction w2 of the polymer and on the temperature T for the system tert-butyl acetate/polystyrene. Within the entire T-range (ca. 0°C – 140°C), χ increases stronger than exponentially with w2, the rise being the larger the larger χH (the enthalpy contribution to χ) becomes in the limit of infinite dilution. At sufficiently high temperatures (≳ 50°C), χH changes its sign from negative to positive as w2 is raised. This…

chemistry.chemical_compoundchemistryVapor pressureEnthalpyPolymer chemistryInverse gas chromatographyOrganic chemistryThermodynamicsPolystyreneFlory–Huggins solution theoryMass fractionLight scatteringDilutionDie Makromolekulare Chemie
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