SKM 2021 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster Session III

CPP 8.29: Poster

Mittwoch, 29. September 2021, 17:30–19:30, P

A thermoresponsive poly(2-oxazoline)-based molecular brush in aqueous solution: effect of a cosolvent — •Bahar Yazdanshenas1, Clemens Sachse2, Stefano Da Vela3, Rainer Jordan2, and Christine M. Papadakis11Technische Universität München, Physik-Department, Garching, Germany — 2Technische Universität Dresden, Fakultät Chemie und Lebensmittelchemie, Dresden, Germany — 3EMBL c/o DESY, Hamburg, Germany

Poly(2-oxazoline)s are well-known for their easy and direct synthesis, providing access to well-defined structures, with tunable properties [1]. In this study, a 1 wt% PiPOx100-g-PEtOx17 molecular brush with a poly(2-isopropenyl-2-oxazoline) (PiPOx) thermoresponsive backbone grafted with thermoresponsive poly(2-ethyl-2-oxazoline) (PEtOx) side chains is investigated in water-ethanol solvent mixtures. This densely grafted polymer with functional and biocompatible segments can be attractive for many applications, such as biomaterials.

In aqueous solution of 3 wt% of this molecular brush, lower critical solution temperature (LCST) behavior has been observed with an increase of the brush length upon heating from room temperature to Tcp [2]. In water-ethanol solvent mixtures of 1 wt% concentration, Tcp increases with the ethanol fraction. The temperature-dependent structural evolution is investigated using dynamic light scattering and synchrotron small-angle X-ray scattering.

[1] R. Hoogenboom, Angewandte Chemie International Edition, 2009, 48, 7978 [2] J.-J. Kang, C. M. Papadakis et al., Colloid Polym. Sci. 2021, 299, 193

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