In Situ Infrared Ellipsometric Study of Stimuli-Responsive Mixed 
Polyelectrolyte Brushes

Mikhaylova, Yulia; Ionov, Leonid; Rappich, Jörg; Gensch, Michael; Esser, Norbert; Minko, Sergiy; Eichhorn, Klaus-Jochen; Stamm, Manfred; Hinrichs, Karsten

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In Situ Infrared Ellipsometric Study of Stimuli-Responsive Mixed Polyelectrolyte Brushes

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Ionov, Leonid
Max Planck Institute of Molecular Cell Biology and Genetics, Max Planck Society;

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Citation

Mikhaylova, Y., Ionov, L., Rappich, J., Gensch, M., Esser, N., Minko, S., et al. (2007). In Situ Infrared Ellipsometric Study of Stimuli-Responsive Mixed Polyelectrolyte Brushes. Analytical Chemistry (Washington), 79(20), 7676-7682.

Cite as: https://hdl.handle.net/21.11116/0000-0001-0F44-3

Abstract

The switching behavior of stimuli-responsive mixed polymer brushes (d ) 11 nm) was monitored for the first time in liquid phase in situ by infrared spectroscopic ellipsometry (IRSE). IRSE is presented as a new, sensitive in situ tool for online analysis of chemical changes in a thin complex film at the solid/liquid interface. Responsive behavior (protonation and deprotonation reaction) of the poly(acrylic acid)/poly(2-vinylpyridine) (PAA-mix-P2VP) brush was probed in aqueous solutions with pH ranging from pH 2 to pH 10. Structural and chemical changes in a thin polymer brush layer were identified from the analysis of infrared ellipsometric tan¾ spectra during the variation of pH. Systematic change in pH confirmed the reversible switching behavior of the PAA-mix-P2VP brush between three different states: swollen P2VP and compact PAA chains at pH 2, a compact P2VP...PAA complex at pH 6.5, and swollen PAA and compact P2VP chains at pH 10.