### Abstract

The liquid-liquid equilibrium of aqueous solutions of hyperbranched polyesters of generation 2, 3 and 4 is described by the lattice-cluster theory. The gist of this approach is the incorporation of the architecture of the polymer directly into the thermodynamic quantities, like Gibbs energy of mixing. The very important geometric parameters describing the polymer architecture are calculated in a new way that seems to be more realistic than older ones. The phase-equilibrium calculations include the binodal curve, the spinodal curve and the critical point neglecting the polydispersity of the polymer samples. Without any additional adjustable parameter these corrections lead to a shift of the cloud-point curve towards higher polymer concentration, as observed in experiments. However, the agreement of the calculated and the experimental values is not quantitative. A possible reason for that may be the disregarding of association effects.

Originalsprache | englisch |
---|---|

Seiten (von - bis) | 127-133 |

Seitenumfang | 7 |

Fachzeitschrift | Fluid phase equilibria |

Jahrgang | 286 |

Ausgabenummer | 2 |

DOIs | |

Publikationsstatus | Veröffentlicht - 15 Dez 2009 |

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### ASJC Scopus subject areas

- !!Chemical Engineering(all)
- !!Physical and Theoretical Chemistry
- !!Physics and Astronomy(all)

### Dies zitieren

*Fluid phase equilibria*,

*286*(2), 127-133. https://doi.org/10.1016/j.fluid.2009.08.013

**Calculation of the liquid-liquid equilibrium of aqueous solutions of hyperbranched polymers.** / Zeiner, T.; Browarzik, D.; Enders, S.

Publikation: Beitrag in einer Fachzeitschrift › Artikel › Forschung › Begutachtung

*Fluid phase equilibria*, Jg. 286, Nr. 2, S. 127-133. https://doi.org/10.1016/j.fluid.2009.08.013

}

TY - JOUR

T1 - Calculation of the liquid-liquid equilibrium of aqueous solutions of hyperbranched polymers

AU - Zeiner, T.

AU - Browarzik, D.

AU - Enders, S.

PY - 2009/12/15

Y1 - 2009/12/15

N2 - The liquid-liquid equilibrium of aqueous solutions of hyperbranched polyesters of generation 2, 3 and 4 is described by the lattice-cluster theory. The gist of this approach is the incorporation of the architecture of the polymer directly into the thermodynamic quantities, like Gibbs energy of mixing. The very important geometric parameters describing the polymer architecture are calculated in a new way that seems to be more realistic than older ones. The phase-equilibrium calculations include the binodal curve, the spinodal curve and the critical point neglecting the polydispersity of the polymer samples. Without any additional adjustable parameter these corrections lead to a shift of the cloud-point curve towards higher polymer concentration, as observed in experiments. However, the agreement of the calculated and the experimental values is not quantitative. A possible reason for that may be the disregarding of association effects.

AB - The liquid-liquid equilibrium of aqueous solutions of hyperbranched polyesters of generation 2, 3 and 4 is described by the lattice-cluster theory. The gist of this approach is the incorporation of the architecture of the polymer directly into the thermodynamic quantities, like Gibbs energy of mixing. The very important geometric parameters describing the polymer architecture are calculated in a new way that seems to be more realistic than older ones. The phase-equilibrium calculations include the binodal curve, the spinodal curve and the critical point neglecting the polydispersity of the polymer samples. Without any additional adjustable parameter these corrections lead to a shift of the cloud-point curve towards higher polymer concentration, as observed in experiments. However, the agreement of the calculated and the experimental values is not quantitative. A possible reason for that may be the disregarding of association effects.

KW - Aqueous hyperbranched polymer solutions

KW - Lattice-cluster theory

KW - Liquid-liquid equilibrium

KW - Method of calculation

KW - Spinodal curve

UR - http://www.scopus.com/inward/record.url?scp=70350335320&partnerID=8YFLogxK

U2 - 10.1016/j.fluid.2009.08.013

DO - 10.1016/j.fluid.2009.08.013

M3 - Article

VL - 286

SP - 127

EP - 133

JO - Fluid phase equilibria

JF - Fluid phase equilibria

SN - 0378-3812

IS - 2

ER -