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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 4: Responsive and Adaptive Systems (joint session CPP/DY)

CPP 4.5: Vortrag

Montag, 1. April 2019, 10:30–10:45, H8

All-in-One ’Schizophrenic’ Self-assembly of Orthogonally Tuned Thermo-responsive Diblock Copolymers — Natalya S. Vishnevetskaya¹, Viet Hildebrand², Peter Müller-Buschbaum¹, André Laschewsky^2,3, and •Christine M. Papadakis¹ — ¹TU München, Physik-Department, Garching, Germany — ²Universität Potsdam, Institut für Chemie, Germany — ³Fraunhofer-Institut für Angewandte Polymerforschung, Potsdam-Golm, Germany

Smart, fully orthogonal switching was realized in a diblock copolymer system with variable trigger-induced aqueous self-assembly [1]. The polymers are composed of non-ionic and zwitterionic blocks featuring lower and upper critical solution temperatures (LCST, UCST). Due to the salt-sensitivity of the zwitterionic block, the UCST can be varied by addition of salt. Superimposed orthogonal switching by electrolytes results in ’schizophrenic’ micellization, in which the roles of the core and the shell block are interchanged. The following switching scenarios are observed by turbidimetry and SANS: i) via a molecularly dissolved state at low NaBr concentrations, or (ii) via an insoluble state at high NaBr concentrations. The versatile and tunable self-assembly of such diblock copolymers offers manifold opportunities, e.g. for smart emulsifiers.
1. N. S. Vishnevetskaya et al., Macromolecules 51, 2604 (2018)