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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 6: Composites and Functional Polymer Hybrids I

CPP 6.3: Vortrag

Montag, 18. März 2024, 12:15–12:30, H 0106

Multi-scale model of the conductivity of diblock copolymer system filled with conductive fillers. — •Alexander Chervanyov — University of Münster, Münster, Germany

We investigate the electrical response of the insulating diblock copolymer system (DBC) filled with conductive fillers depending on the following factors: (i) composite temperature and morphology; (ii) affinities of fillers for copolymer blocks; (iii) interaction between fillers. By performing consistent phase-field and Monte-Carlo simulations of a filled DBC system, we demonstrate that the location of fillers in DBC essentially depends on the above three factors. The simulated distribution of fillers in DBC, in turn, proves to be directly related to the electrical response of the composite, calculated by the developed model. In particular, the order-disorder transition in DBC system is found to co-occur with the insulator-conductor transition in the filler network provided a sufficient difference between the affinities of fillers for dissimilar DBC blocks. The order-order transition between the lamella and cylindrical morphologies of DBC is found to cause a spike in the composite conductivity.

Keywords: diblock copolymers; filler; conductivity