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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

preprint
submitted on 04.09.2020 and posted on 07.09.2020 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.

Funding

Deutsche Forschungsgemeinschaft, Grant number DFG LE 1424/7

Czech Science Foundation, Grant number 18-22059S

History

Email Address of Submitting Author

lederer@ipfdd.de

Institution

Leibniz-Institut für Polymerforschung Dresden

Country

Germany

ORCID For Submitting Author

0000-0002-1760-6426

Declaration of Conflict of Interest

No conflict of interest.

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