Regensburg 2004 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 15: POSTER: Polymers and Biomaterials

CPP 15.2: Poster

Dienstag, 9. März 2004, 17:00–19:00, B

Properties and Crystallization of PNIPAM-co-PS core-shell microgels — •Thomas Hellweg — TU Berlin, Stranski Laboratorium, Strasse des 17.Juni 112, 10623 Berlin

During the last decade thermosensitive hydrogels have received increasing attention due to their potential with respect to applications in drug delivery or as sensors. However, macroscopic gels have rather long equilibration times with respect to swelling and deswelling. In some cases it might take days until the equilibrium state is reached. Therefore, with respect to applications as sensors or drug delivery systems so called microgels have preferable properties compared to their macroscopic homologues. Recently, these particles were also investigated with respect to their crystallization behaviour. Due to their low polydispersity they form colloidal crystals in solution as usual hard-sphere colloids. Additionally, their response to temperature allows to vary the volume fraction over a wide range. Here, we are going to discuss the properties of poly((N-isopropyl acrylamide)-co-polystyrene (PNIPAM-co-PS) core-shell microgel particles with extended PNIPAM shells. The particles are characterized by dynamic light scattering (DLS), electron microscopy and SANS.