Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 43: Poster: The Physics of Water Interactions with Biological Matter
CPP 43.1: Poster
Mittwoch, 9. März 2016, 18:15–21:00, Poster B2
Phase behavior of thermoresponsive polymers in dependence on temperature and pressure — •Kora-Lee Claude1, Simon Pinzek1, Konstantinos Kyriakos1, Anna Miasnikova2, André Laschewsky2, Peter Müller-Buschbaum1, Alfons Schulte3, and Christine M. Papadakis1 — 1Technische Universität München, Physik-Department, Garching, Germany — 2Universität Potsdam, Institut für Chemie, Germany — 3University of Central Florida, Department of Physics and College of Optics & Photonics, Orlando, U.S.A.
Thermoresponsive polymers constitute an important class of soft matter. Poly(N-isopropyl acrylamide) (PNIPAM) exhibits lower critical solution temperature (LCST) behaviour in aqueous solution: When heated above the cloud point, the chains release water and collapse, leading to phase separation. As an alternative to temperature variation, the phase transition can also be induced applying high pressure, which offers the possibility to map out p-T-phase diagrams.
In the present work, we use temperature- and pressure-resolved turbidimetry to measure the p-T-phase diagram of PNIPAM in a large range and to determine the involved thermodynamic parameters more precisely. Moreover, block copolymers from polystyrene and PNIPAM as well as a novel thermoresponsive polymer are investigated.