Regensburg 2010 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 10: Poster: Structure and Dynamics of Responsive Hydrogels

CPP 10.6: Poster

Monday, March 22, 2010, 16:30–18:00, Poster C

Hydrogels based on NIPAM — •Marcel Richter and Regine von Klitzing — Stranski-Laboratorium, Institut für Chemie, TU Berlin, Straße des 17.Juni, 10623 Berlin

During the last decades microgels made of N-isopropylacrylamide (NIPAM) have attracted much interest and were studied by several techniques like microscopy and light scattering [1]. These polymer particles show thermoresponsive behaviour and can therefore be classified as *smart* materials.

One aim of our studies is the raise of the size of microgels which we build up to around 1 *m. In this case we follow two strategies of preparing these particles. On the one hand we use core-shell microgel with NIPAM and on the other hand we added a co-monomer into the core surrounded by a NIPAM shell. For both strategies microgel particles are synthesized by emulsion polymerization without using any surfactants at temperature about 70^∘C [2]. The size of microgels is determined by Dynamic Light Scattering and Atomic Force Microscopy. The prepared nanoparticles were used for investigation on silica surfaces. Here, the behaviour and the coverage of the surface are investigated by changing external parameter like temperature and salinity.

[1] *K. Kratz, T. Hellweg, W. Eimer, Polymer (2001), 42, 6531 [2]*R. Pelton, Adv. Colloid Interface Sci. (2000), 85, 1