Dresden 2017 – wissenschaftliches Programm
CPP 56.2: Vortrag
Donnerstag, 23. März 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 . 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)) . 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).