Dresden 2017 – wissenschaftliches Programm
CPP 56.4: Vortrag
Donnerstag, 23. März 2017, 11:15–11:30, ZEU 260
Phase behaviour of PNIPMAM in dependence on temperature and pressure — •Kora-Lee Claude1, Bart-Jan Niebuur1, Dionysia Aravopoulou2, Viet Hildebrand4, André Laschewsky4, Apostolos Kyritsis2, Peter Müller-Buschbaum1, Alfons Schulte3, and Christine M. Papadakis1 — 1Technische Universität München, Physik-Department, Physik weicher Materie/Lehrstuhl für funktionelle Materialien, Garching, Germany — 2National Technical University of Athens, Physics Department, Athens, Greece — 3University of Central Florida, Department of Physics and College of Optics & Photonics, Orlando, U.S.A. — 4Universität Potsdam and Fraunhofer Institute for Applied Polymer Research, Potsdam-Golm, Germany
Poly(N-isopropylmethacrylamide) (PNIPMAM) is a thermoresponsive polymer which differs from the well-known PNIPAM by having an additional methyl group attached to the vinyl backbone. Thus, it may be expected to be more hydrophobic, however, its cloud point at 42°C is about 10°C higher.
In order to gain more information on the phase behaviour of PNIPMAM in dependence on temperature, pressure and concentration, we investigated the transition by DSC, the structural behaviour by temperature-resolved SANS and mapped out the pressure-dependent phase diagram using turbidimetry.
It seems that the additional methyl group stabilizes the one-phase region, even at higher pressures, which could be explained by steric hindrance.