In-situ observation of polyelectrolyte diffusion
Diffusion of the polyanion within polyelectrolyte multilayers (PEMs) is probed in-situ. The PEMs consist of a deuterated and a protonated slab prepared by selectively deuterated polyanions. Annealing in high salt solution causes interdiffusion which broadens the internal interface between the two compartments and allows to calculate the diffusion constant D. Preliminary experiments indicate a glass transition temperature at 50 - 60°C. The dependence of the diffusion constant on (i) the temperature approaching the glass transition and (ii) the salt concentration at an elevated temperature will be studied systematically. This series of experiments will be explored with a system slightly below the entanglement limit; for better understanding few exploratory experiments substantially above and below the entanglement limit will be performed. These experiments are an essential part of the thesis of Annekatrin Sill and Peter Thran (support by SFB 1270, project A04).
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HELM Christiane A.; AHRENS Heiko; GUTFREUND Philipp; MICCIULLA Samantha; SILL Annekatrin and Olaf Soltwedel. (2021). In-situ observation of polyelectrolyte diffusion. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-2054
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