6533b824fe1ef96bd1280934
RESEARCH PRODUCT
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H. GeerissenBernhard A. WolfJürgen Roossubject
SolventHildebrand solubility parameterViscosityChemistryPolymer chemistryMelting pointOrganic chemistryThermodynamicsFractionationSolubilityIntensity (heat transfer)Bar (unit)description
From the break-down in the viscosity and from the increase of the intensity of the scattered light, associated with the entrance into the two-phase region, the pressure dependence of the demixing temperature of solutions of PVC 37 000, PVC 75 000 and PVC 100 000 in phenetole and PVC 75 000 in o-xylene was measured up to 1 000 bar. (The numbers in the codes of the PVC specimens are their approximate molecular weights.) The application of pressure increases the demixing temperatures of PVC in both solvents by about 1 K/100 bar. For a qualitative forecast of the pressure effects, the solubility parameter theory in combination with the corresponding states principle, and an empirical correlation to the relative distance of the critical demixing temperature to the melting point of the pure solvent were used. The results of both concepts are in accord with the experimental findings.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1985-04-01 | Die Makromolekulare Chemie |