Dresden 2017 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 56: Hydrogels and Microgels I

CPP 56.2: Talk

Thursday, March 23, 2017, 10:45–11:00, ZEU 260

Responsive polymer hydrogels: physical gelling through polyion complexation — Margarita A. Dyakonova¹, Anatoly V. Berezkin¹, Nicoletta Stavrouli², Maria T. Popescu², Constantinos Tsitsilianis², and •Christine M. Papadakis¹ — ¹Technische Universität München, Physik-Department, Fachgebiet Physik weicher Materie, Garching, Germany — ²University of Patras, Department of Chemical Engineering, Greece

Responsive polymer-based hydrogels may be formed through association of oppositely charged polyion segments [1]. Network formation is due to charged chains which physically crosslink by ion pair formation arising from intermolecular polyionic complexation of oppositely charged repeating units.

We present results from dynamic mechanical measurements, small-angle neutron scattering and computer simulations on hydrogels formed by triblock copolymers bearing oppositely charged blocks (poly(acrylic acid) and quaternized poly(2-vinylpyridine)) [2]. Due to the weak nature of the involved polyions, these hydrogels respond strongly to pH and to the presence of salt.
1. C. Tsitsilianis, C.M. Papadakis, Gels, submitted.
2. Dyakonova M. et al., Macromolecules 47, 7561 (2014) and 48, 8177 (2015).