SKM 2021 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 4: Focus: The Physics of Adaptive Polymer Networks
CPP 4.5: Invited Talk
Tuesday, September 28, 2021, 11:45–12:15, H3
Tunable self-assembled hydrogels from block copolymers with thermoresponsive and pH-responsive blocks — •Christine M. Papadakis1, Florian A. Jung1, and Constantinos Tsitsilianis2 — 1Physics Department, Technical University of Munich, Garching, Germany — 2Department of Chemical Engineering, University of Patras, Greece
Pentablock terpolymers with thermoresponsive end blocks and a pH-responsive middle block form hydrogels in aqueous environment. By altering the stability of the crosslinks and the degree of bridging, the responsivities afford numerous possibilities to tune the mechanical properties. Small-angle neutron scattering revealed the underlying mesoscopic structures in dependence on temperature and the pH value [1]. The thin film geometry allows studying the microphase-separated structures in the dry state and during swelling in the vapor of water or organic solvents in situ using grazing-incidence small-angle X-ray scattering. The results reveal the role of the dielectric properties of the solvent for microphase separation and hydrogel formation [2].
[1] C. Tsitsilianis et al., Macromolecules 2018, 51, 2169. F. A. Jung et al., Macromolecules 2019, 52, 9746. M. M. S. Lencina, et al., ACS Appl. Polym. Mater. 2021, 3, 819.
[2] F. A. Jung et al., Macromolecules 2020, 53, 6255.