Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Polyelectrolytes
CPP 17.6: Vortrag
Dienstag, 8. März 2016, 11:15–11:30, H40
Mutual effects in the temperature responsive behaviour of brush/multilayer composites — •Samantha Micciulla1, Olaf Soltwedel2, Oliver Löhmann1, and Regine von Klitzing1 — 1TU Berlin, Germany — 2FRM-II, MLZ Garching, Germany
The extensive use of polymers to prepare smart coatings is reasoned by their versatility to be assembled or synthesized in different geometries and to the large variety of responsiveness obtained by the choice of specific functionality. The present study focuses on the investigation of the temperature-responsive behavior of a composite made by polyelectrolyte multilayers (PEMs) physisorbed onto temperature-sensitive brushes. Ellipsometry was used to monitor the brush collapse from the thickness decrease as a function of temperature, while neutron reflectometry was applied to deduce the change of monomer distribution perpendicular to the substrate at temperatures below, across and above the phase transition, respectively. The results showed that the adsorption of PEMs enhanced the hydrophobicity of the charged region of the polymer brush, which directly interacts with the adsorbing chains, and this caused a shift of its phase transition to lower temperature. Moreover, the internal contrast obtained by combining hydrogenated brushes with deuterated PEMs allowed to highlight the penetration of polyelectrolyte chains inside the charged brush by comparing the neutron scattering length density profile of pure and corresponding PEM-capped brushes. This study demonstrates the possibility of creating complex brush/multilayer composites preserving the responsive behavior behind the significant interpolyelectrolyte interactions.