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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 10: Wetting, Fluidics and Liquids at Interfaces and Surfaces I (joint session CPP/DY)
CPP 10.3: Vortrag
Montag, 17. März 2025, 16:45–17:00, H34
How do polymers of different architecture penetrate nanochannels? — •Panagiotis Kardasis1 and George Floudas2 — 1Department of Physics, University of Ioannina, 45110 Ioannina, Greece — 2Max Planck Institute for Polymer Research, 55128 Mainz, Germany
The way that polymers penetrate narrow pores is of both academic and technological importance. Capillary force can drag polymer chains into nanopores, a process called imbibition. Using in situ nanodielectric spectroscopy (nDS), we report the imbibition and following adsorption kinetics of star cis-1,4-polyisoprenes (SPI) and of bottlebrush polymers directly at the chain length scale by monitoring the evolution of the normal modes, during the flow within in alumina nanopores (AAO), as a function of chain architecture (vs linear), pore size, molar mass, and temperature. We demonstrate that the imbibition kinetics of SPIs proceeds via a slow adsorption mechanism, about 2 orders of magnitude slower than in linear polyisoprenes (PI). We further demonstrate that the bottlebrush topology results in slower adsorption in nanopores in comparison to linear counterpart, albeit, with different dependence. Additionally, bottlebrushes present weaker temperature dependence comparing to both linear and star polymers. Furthermore, we explore how symmetric star / linear and brush / linear blends penetrate the same nanopores and we demonstrate that differences in the imbibition and adsorption kinetics can be used to separate the homogeneous blend to its components, giving rise to *topology sorting*, based on the relative viscosities and pore diameter.
Keywords: Adsorption; Nanopores; Imbibition; Polymers; Topology