6533b829fe1ef96bd128ac59
RESEARCH PRODUCT
Sedimentation of dissolved macromolecules in the vicinity of the consolute point 1. Strictly binary systems and kinetic considerations
M. BallauffBernhard A. Wolfsubject
BinodalPolymers and PlasticsChemistryDispersityThermodynamicsFlory–Huggins solution theoryKinetic energyCondensed Matter::Soft Condensed Matterchemistry.chemical_compoundColloid and Surface ChemistryCritical point (thermodynamics)Volume fractionMaterials ChemistryBinary systemPolystyrenePhysical and Theoretical Chemistrydescription
This paper analyzes the effect of gravity on polymer solutions near the consolute point. Calculations are carried out for monodisperse polystyrene in cyclohexane using the Flory-Huggins expression with a concentration-dependent interaction parameter for the free energy of mixing. Depending on molecular weight and distance to the demixing temperature, the influence of gravity leads to non-negligible gradients of the volume fraction in the one-phase region as well as in the two-phase region. In particular, the effect of gravity on the measurement of the coexistence curve in a finite sample is calculated explicitly.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1986-03-01 | Colloid & Polymer Science |