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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 36: Poster: (Hydro)gels and Elastomers

CPP 36.8: Poster

Mittwoch, 13. März 2013, 16:30–18:30, Poster C

Co-non-solvency effect of adsorbed thermo-responsive gel particles — •Marcel Richter, Melanie Hunnenmörder, and Regine von Klitzing — TU Berlin

During the last decades microgels made of N-isopropylacrylamide (NIPAM) have attracted much interest and were studied by several techniques like atomic force microscopy (AFM) and dynamic light scattering (DLS) [1]. These polymer particles show thermo responsive behaviour and can therefore be classified as *smart* materials. The Co-non-solvency effect in the different water/ solvent compositions are well investigated for the bulk phase [2, 3] but not at the surface. Those colloidal particles are of great interest as carrier systems and sensors [4]. For this purpose the understanding of such particles in different organic solvent mixtures is necessary. The presented study focuses on the swelling behaviour of PNIPAM and PNIPAM-co-AAA microgels in different water/ solvent compositions. The question will be answered: How much the particles swell from the dry to the liquid state? Furthermore, the particle size in different water/ solvent ratio is investigated. The used solvents are ethanol, iso-propanol and tetrahydrofuran. T The size of microgels is determined by Dynamic Light Scattering and Scanning Force Microscopy. [1] K. Kratz, T. Hellweg, W. Eimer, Polymer (2001), 42, 6531 [2] B. Saunders et al, Macromolecules (1997), 30, 482 [3] Christine Scherzinger et al, Macromolecules (2010), 43, 6829 [4] J. Kim, Angewandte Chemie (2005), 117, 1357