Phase behaviour of hyperbranched polymers in demixed solvents

Hyperbranched polymers as phase forming components in aqueous two-phase extraction

“…As water is the simplest and the smallest molecule in the investigated systems it was assumed that it is composed of one segment. As shown in the literature [28,30] the structural parameters are fixed by the polymer architecture and they are not considered to be adjustable model parameters. For that reason in the calculation of partitioning coefficient in dependency we used for dextran, polyethylene glycol and polyesteramide the same structural parameters which were specified in the former work.…”

“…The additional parameter ij k is introducedto consider the deviation of the cross-association energy from the geometrical mixing rule [30].The association parameters asso ii K , asso ii  and ij k are obtained by model fitting to the experimental equilibrium data.The segment fraction of the non-associated segments i A X can be foundby using the following equation: …”

“…The associative interactions can be considered by means of an appropriate association model. In this contribution we combined the LCT with the lattice version of Wertheim association theory developed by van Durme [26,27].By using this thermodynamic approach binary and ternary liquidliquidequilibria [28][29][30][31][32][33]as well as solid-liquid equilibrium [34] can be successfully modelled.The combination of the LCT and Wertheim association theory is appliedin this work for the calculation of the partitioning coefficient of an amino acid in ATPS's, i.e. the model is used for the first time for quaternary mixtures.…”

Liquid–liquid phase equilibria of hyperbranched polymers—Experimental study and modeling

“…Experimental studies of the liquid-liquid equilibria of aqueous solutions of Boltorn polymers with different generation numbers g were performed by Jang and Bae [17] for polymers of g = 2, g = 3 and g = 4, by Seiler et al [18] for g = 4 and Zeiner et al [19,20] for g = 2. Unfortunately, there are remarkable differences between the existing experimental LLE data, and more work has to be done to get reliable information about the demixing behavior of Boltorn polymers.…”

Thermodynamische Fragestellungen bei der Anwendung von hyperverzweigten Polymeren

“…Bei der Modellierung ist es notwendig, den Einfluss der Architektur des hyperverzweigten Polymers und der funktionellen Gruppen zu berücksichtigen [1]. Eine Möglichkeit dafür bietet die Lattice Cluster Theory (LCT) [2].…”