Regensburg 2019 – wissenschaftliches Programm
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. Papadakis1 — 1TU 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.