Regensburg 2010 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 10: Poster: Structure and Dynamics of Responsive Hydrogels

CPP 10.7: Poster

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

Thermoresponsive Behaviour of adsorbed P(NIPAM-co-AAc) Microgel Particles — Anna Burmistrova, •Marcel Richter, and Regine von Klitzing — Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany

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. Monodisperse PNIPAM microgels were synthesized by emulsion polymerisation without using surfactants. To receive the pH-sensitive microgels, aclylic acid (AAc) as a co-monomer was used. [2, 3]. The particles were adsorbed on the different substrates (silicon precoated with different polyelectrolytes and gold) [4, 5]. The thermo induced swelling/deswelling behaviour of adsorbed microgels was studied by Atomic Force Microscopy and Quartz Crystal Microbalance methods. The effect of co-monomer content (AAc), effect of pH and effect of ionic strength were investigated.

[1] K. Kratz, T. Hellweg, W. Eimer, Polymer (2001) 42, 6531 [2] S. Höfl, l. Zitzler, T. Hellweg, S. Herminghaus, F. Mugele, Polymer (2007) 48, 245 [3] S. Nayak, L.A. Lyon, Angew. Chem. (2005), 117, 7862 [4] S. Schmidt, T. Hellweg, R.v. Klitzing, Langmuir (2008), 24, 12595 [5] Stephan Schmidt, Hubert Motschmann, Thomas Hellweg, Regine von Klitzing, Polymer (2008), 49, 3, 749