Dresden 2020 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 24: Poster Session I

CPP 24.46: Poster

Monday, March 16, 2020, 17:30–19:30, P3

Dehydration process of thermoresponsive molecular brushes with copolymer side chains — •Jia-Jhen Kang¹, Junpeng Zhao², Lester C. Barnsley³, Fabian Kohler¹, Hendrik Dietz¹, Stergios Pispas², and Christine M. Papadakis¹ — ¹TU München, Physik-Department, Garching, Germany — ²National Hellenic Research Foundation, Theoretical and Physical Chemistry Institute, Athens, Greece — ³FZ Jülich, JCNS at MLZ, Garching, Germany

Molecular brushes are densely grafted polymers composed of a backbone and side chains attached to virtually every monomer of the backbone. In the present study, we investigate molecular brushes with PEO-ran-PPO or PEO-block-PPO copolymer side chains in aqueous solution. Both PEO, poly(ethylene oxide), and PPO, poly(propylene oxide), exhibit lower critical solution temperature (LCST) behavior with very different cloud points. Their structural evolution upon heating from ambient temperature to temperatures above the corresponding cloud points is resolved using dynamic light scattering (DLS) and small-angle neutron scattering (SANS). The results reveal that the vastly different dehydration process strongly affects the side chain conformation, and thus the overall brush conformation as well as the collapse and the aggregation behavior.