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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 39: French-German Session: Nanomaterials, Composites and Hybrids I

CPP 39.6: Talk

Wednesday, March 11, 2026, 16:30–16:45, ZEU/0260

Morphology-controlled electrical and thermal conductivity of filled diblock copolymers: effect of filler shape. — •Alexander Chervanyov — University of Münster, Münster, Germany

We investigate the electrical and thermal conductivity of an electrically insulating diblock copolymer (DBC) matrix filled with conductive cylindrical and spherical nanofillers modeling carbon nanotubes (CNTs) and carbon black (CB), respectively. The composite transport properties are examined as functions of the underlying DBC morphology, the selective affinities of CNTs and CB for the dissimilar DBC blocks, and inter-filler interactions that determine the positional and, for CNTs, orientational correlations. Using a combined phase-field description of the DBC host and Monte Carlo simulations of anisotropic CNT fillers, we show that the localization and alignment of CNTs within the microphase-separated domains are highly sensitive to the above parameters. The simulated CNT and CB network structures are used to compute the electrical and thermal response of the composite. We quantitatively elucidate how the morphological transitions in the DBC correlate with structural rearrangements of the filler networks. Furthermore, we demonstrate that both the order-disorder transition and the order-order transitions between distinct DBC morphologies lead to pronounced changes in composite conductivity, driven by morphology-induced restructuring and alignment of the conductive pathways formed by CNT and CB.

Financial support of Deutsche Forschungsgemeinschaft (DFG) through Grant No. CH 845/2-3, is gratefully acknowledged.

Keywords: diblock copolymers; fillers; conductivity; nanocomposites; phase-field model