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The Role of Solubility in Thermal Field Flow Frac-tionation – A Revisited Theoretical Approach for Tuning the Separation of Chain-Walking Polymerized Polyethylene

submitted on 04.09.2020, 15:27 and posted on 07.09.2020, 09:23 by Martin Geisler, Laura Plüschke, Jan Merna, Albena Lederer
The influence of the polymer solubility on the separation efficiency in thermal field-flow fractionation (ThFFF) was investigated for a polymer model system of differently branched chain walking polyethylenes in five different solvents, which were selected depending on their physical parameters. The understanding of polymer thermal diffusion has been elucidated using a revisited approach based on the latest thermal diffusion prediction model by Mes,
Kok and Tijssen combined with the Hansen solubility theory. Thereby, a significant improvement in the precision of the thermal diffusion prediction and the separation efficiency has been achieved by implementation of the temperature dependency on Hansen solubility parameters. In addition, we demonstrate a method for validation of the segmental size of polymer chains with varying topology by using the revisited thermal diffusion prediction approach in inverse mode and experimental thermal diffusion data.


Deutsche Forschungsgemeinschaft, Grant number DFG LE 1424/7

Czech Science Foundation, Grant number 18-22059S


Email Address of Submitting Author


Leibniz-Institut für Polymerforschung Dresden



ORCID For Submitting Author


Declaration of Conflict of Interest

No conflict of interest.