Regensburg 2019 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 2: Responsive and Adaptive Systems (joint session CPP/DY)

DY 2.4: Vortrag

Montag, 1. April 2019, 10:15–10:30, H8

The structural and dynamic behavior of the thermoresponsive polymer Poly(N-isopropylmethacrylamide) — •Chia-Hsin Ko1, Kora-Lee Claude1, Dirk Schanzenbach2, Bart-Jan Niebuur1, Henrich Frielinghaus3, Lester Barnsley3, Vitaliy Pipich3, Alfons Schulte4, Peter Müller-Buschbaum1, André Laschewsky2, 5, and Christine M. Papadakis11TU München, Physik-Department, Garching, Germany — 2Universität Potsdam, Institut für Chemie, Germany — 3FZ Jülich, JCNS at MLZ, Garching, Germany — 4University of Central Florida, Department of Physics, Orlando, U.S.A — 5Fraunhofer-Institut für Angewandte Polymerforschung, Potsdam-Golm, Germany

Poly(N-isopropylmethacrylamide) (PNIPMAM) is a thermoresponsive polymer, exhibiting lower critical solution temperature (LCST) behavior in aqueous solution. Compared to the well-investigated poly(N-isopropylacrylamide) (PNIPAM), which has similar chemical structure, PNIPMAM has a higher transition temperature (43 C instead of 32 C). This may be due to the presence of the additional methyl groups on the vinyl backbone, which cause steric hindrance and weaken the intramolecular interactions. We investigate the temperature- and concentration-dependent phase behavior of PNIPMAM in D2O using turbidimetry, dynamic light scattering (DLS), small-angle neutron scattering (SANS) and Raman spectroscopy. The main difference from PNIPAM are inhomogeneities in the one-phase state due to physical crosslinks caused by the methyl groups.

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