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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 31: Responsive and Adaptive Polymers

CPP 31.6: Vortrag

Mittwoch, 19. März 2025, 17:45–18:00, H38

Structure and dynamics in injectable hydrogels from thermoresponsive triblock terpolymers — •Feifei Zheng¹, Pablo A. Álvarez Herrera¹, Wenqi Xu¹, Joachim Kohlbrecher², Sohila Abdelhafiz³, Anna P. Constantinou⁴, Theoni Georgiou⁴, Aristide Dogariu³, and Christine M. Papadakis¹ — ¹Technical University of Munich, TUM School of Natural Sciences, Garching, Germany — ²Paul Scherrer Institut, Villigen, Switzerland — ³CREOL, University of Central Florida, Orlando, USA — ⁴Imperial College London, Department of Materials, London, UK

Block copolymers with blocks featuring lower critical solution temperature behaviour have attracted great interest for 3D bioprinting because they form a runny solution at room temperature, but a hydrogel at body temperature. The structure of the solution and the hydrogel as well as dynamic information and their changes upon gelation are essential for understanding. Here we address an ABC triblock terpolymer consisting of a hydrophilic A block, a hydrophobic B, and a thermoresponsive C block. The results from small-angle neutron scattering on 15 wt% polymer solutions indicate that ABC form spherical core-shell micelles, that transform into cylinders in the gel state and form a more compact structure upon heating. By the combination of dynamic light scattering (DLS) and spatiotemporal coherence-gated DLS measurements, the dynamic information of gelation process was retrieved, which reveals the thermoresponsive C block contracts and the micelles aggregate to from the gel upon heating.

Keywords: thermoresponsive; hydrogel; neutron scattering; dynamic light scattering