Berlin 2018 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: Poster Session I

CPP 20.14: Poster

Monday, March 12, 2018, 17:30–19:30, Poster A

The structural, thermal and dynamic behavior of the thermoresponsive polymer Poly(N-isopropylmethyacrylamide) — •Chia-Hsin Ko¹, Kora-Lee Claude¹, Dirk Schanzenbach², Bart-Jan Niebuur¹, Xiaohan Zhang¹, Dionysia Aravopoulou³, Apostolos Kyritsis³, Henrich Frielinghaus⁴, Peter Müller-Buschbaum¹, André Laschewsky^2,5, and Christine M. Papadakis¹ — ¹TU München, Physik-Department, Garching, Germany — ²Universität Potsdam, Institut für Chemie, Potsdam-Golm, Germany — ³National Technical University of Athens, Greece — ⁴Forschungszentrum Jülich GmbH, JCNS at MLZ, Garching, Germany — ⁵Fraunhofer-Institut für Angewandte Polymerforschung, Potsdam-Golm, Germany

Poly(N-isopropylmethyacrylamide) (PNIPMAM) is a thermoresponsive polymer, exhibiting lower critical solution temperature (LCST) behavior in aqueous solution with a cloud point at ~43 °C. We investigate the temperature- and concentration-dependent phase behavior of PNIPMAM in D2O using turbidimetry, differential scanning calorimetry (DSC), small-angle neutron scattering and dynamic light scattering. We find that the phase transition consists of two steps, namely (i) hydrophobic aggregation at ~39 °C, as evident from turbidmetry and SANS and (ii) the chain collapse and water release at ~44 °C, as evident from DSC and SANS.