Dresden 2017 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 56: Hydrogels and Microgels I

CPP 56.4: Talk

Thursday, March 23, 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.