Details

Autor(en) / Beteiligte

• Rätzsch, Margit T.
• Kehlen, Horst
• Thieme, Detlef

Titel

Oligomer Compatibility by Continuous Thermodynamics

Ist Teil von

• Journal of macromolecular science. Chemistry, 1987-08, Vol.24 (8), p.991-1004

Ort / Verlag

New York, NY: Taylor & Francis Group

Erscheinungsjahr

1987

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• To describe the details of the liquid-liquid equilibrium of oligomer mixtures, it is essential to use Gibbs free energy functions generalizing the classical Flory Huggins relation by replacing Huggins' X-term by a function depending on the averages of the molecular weight distributions. In this paper the concept of continuous thermodynamics is applied to establish a simple calculation procedure for the number-average segment number. Instead of the well-known sums with respect to the species, integrals occur which, in the case of Schulz-Flory distributions, may be calculated analytically, leading to simple formulas for the cloud-point curve and the shadow curve. The method is applied to model calculations showing that the chosen Gibbs free energy function may account for the details of the liquid-liquid equilibrium of oligomer mixtures and to a real oligomer system taken from the literature.