SKM 2021 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 6: Poster Session II

CPP 6.24: Poster

Dienstag, 28. September 2021, 17:30–19:30, P

Phase behavior of randomly crosslinked diblock copolymers — •Gaoyuan Wang, Annette Zippelius, and Marcus Müller — Institut für Theoretische Physik, Georg-August-Universität Göttingen, Deutschland

We have investigated the structure and the phase behavior of randomly crosslinked polymer networks formed by connecting symmetric diblock copolymers via covalent bonds. Particle-base Monte-Carlo simulation is applied to study the order-disorder transition, controlled by the Flory-Huggins parameter χ. We provide an accurate phase diagram, in which the χc N of the ODT is shown as a function of the crosslink density p and Flory-Huggins parameter of the preparation state χp N. Depending on χp N, the random crosslinks support the disordered or periodically ordered state over a larger range of incompatibilities (χ N), because the irreversible bonds impart a memory of the structure that existed at their formation. Knowing the amount of crosslinking required to retain a microphase-separated or disordered structure at a χ N that considerably differs from the preparation state is helpful for generating desired states, which may only be metastable without crosslinks.

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