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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 38: Polymer Networks and Elastomers

CPP 38.2: Vortrag

Mittwoch, 3. April 2019, 11:45–12:00, H18

Microphase separation in cross-linked copolymers — •Gaoyuan Wang, Annette Zippelius, and Marcus Müller — Institut für Theoretische Physik, Friedrich-Hund-Platz 1, 37077 Göttingen, Deutschland

Using particle-based simulations of a soft, coarse-grained model in conjunction with the Single-Chain-in-Mean-Field algorithm we have studied the cross-linking of (diblock) polymer melts and the subsequent microphase separation the cross-linked systems upon increasing the incompatibility, χN, between the two blocks. Without cross-linking, the simulated order-disorder transition (ODT) between a lamellar and a disordered liquid is shifted away from the mean-field prediction χN = 10.5 and is of first-order. With increasing cross-link density, the χN, at which the ODT occurs (for fixed cross-link density), shifts to larger values. Beyond the cross-link density of 1 per chain a gradual formation of a microemulsion-like structure (disordered gel) is formed, i.e., the morphology features a characteristic length scale but not long- range order. When we cross-link a lamellar liquid at χN > χODT and decrease χN, the χN at which the ODT occurs (i.e. long-range order is lost) differs from the previous one.