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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 15: Poster I

CPP 15.37: Poster

Montag, 18. März 2024, 18:00–20:00, Poster C

Phase behavior of thermo- and photoresponsive diblock copolymers for non-invasive schizophrenic switching — •Peiran Zhang¹, René Steinbrecher², André Laschewsky², Dmytro Soloviov³, Peter Müller-Buschbaum¹, and Christine M. Papadakis¹ — ¹Technical University of Munich, TUM School of Natural Sciences, Garching, Germany — ²University of Potsdam, Institute of Chemistry, Potsdam-Golm, Germany — ³European Molecular Biology Laboratory, c/o DESY, Hamburg, Germany

Stimuli-responsive diblock copolymers (DBCPs) are of interest as carriers due to their change of properties upon exposure to external stimuli, such as temperature and light. In this study, we present the phase behavior of a series of DBCPs comprising thermo-responsive blocks, one of which is functionalized with a photoactive group. Thus, the DBCP will feature a fixed cloud point (CP) due to the singly responsive block and a tunable CP due to the doubly responsive block. This way, the DBCPs can self-assemble in aqueous solution into micelles and inverse micelles, achieving "schizophrenic switching". Dynamic light scattering indicates that all DBCPs under investigation show a single CP in dilute aqueous solution, namely the one of the singly thermoresponsive block. Small angle X-ray scattering reveals that the DBCPs are expanded chains below this CP and are collapsed at temperatures above, forming large aggregates. Switching the photoactive group by UV irradiation does not have an effect on this behavior, which points to a very high CP of the doubly responsive block.

Keywords: responsive polymers; self-assembly; light scattering