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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 22: Poster Session III - Charged Soft Matter and Theory and Simulation
CPP 22.37: Poster
Mittwoch, 24. März 2021, 16:30–18:30, CPPp
Phase behavior of polymeric microemulsion in ternary A+B+AB blends — •Russell Spencer1 and Mark Matsen2 — 1Georg-August Universität Göttingen, Institute for Theoretical Physics, 37077 Göttingen, Germany — 2Department of Chemical Engineering, Department of Physics & Astronomy, and Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
Ternary blends of AB diblock copolymers with A and B homopolymers microphase segregate into lamellae (LAM) for copolymer-rich blends and macrophase segregate into A- and B-rich regions for homopolymer-rich blends. Mean-field theory predicts that these regions are separated by three-phase coexistence of the LAM, A-rich, and B-rich phases, which terminates at a Lifshitz critical point. Experiments, however, report that the Lifshitz point is destroyed by fluctuations and that the three-phase coexistence is replaced by a channel of bicontinuous microemulsion (BμE). Using field-theoretic simulations, we show that fluctuations do indeed destroy the Lifshitz point, but that three-phase coexistence continues to exist. However, at high temperatures, the LAM+A+B coexistence predicted by mean-field theory is replaced by BμE+A+B coexistence. We speculate that the single-phase BμE observed in experiments is a result of kinetic trapping as the blend is cooled from the mixed state.