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Crystallisation Kinetics and Associated Electrical Conductivity Dynamics of Poly(Ethylene Vinyl Acetate) Nanocomposites in the Melt State

Affiliation
Department of Applied Physics, Chalmers University of Technology, 412 96 Gothenburg, Sweden
Stalmann, Gertrud;
Affiliation
Department of Applied Physics, Chalmers University of Technology, 412 96 Gothenburg, Sweden
Matic, Aleksandar;
Affiliation
Department of Applied Physics, Chalmers University of Technology, 412 96 Gothenburg, Sweden
Jacobsson, Per;
ORCID
0000-0002-1529-1395
Affiliation
Innovation & Technology, Borealis Polyolefine GmbH, 4021 Linz, Austria
Tranchida, Davide;
ORCID
0000-0002-6517-0153
Affiliation
Innovation & Technology, Borealis Polyolefine GmbH, 4021 Linz, Austria
Gitsas, Antonis;
ORCID
0000-0001-7837-6823
Affiliation
Innovation & Technology, Borealis AB, 444 86 Stenungsund, Sweden
Gkourmpis, Thomas

Nanocomposite systems comprised of a poly(ethylene vinyl acetate) (EVA) matrix and carbon black (CB) or graphene nanoplatelets (GNPs) were used to investigate conductivity and crystallisation dynamics using a commercially relevant melt-state mixing process. Crystallisation kinetics and morphology, as investigated by DSC and SEM, turn out to depend on the interplay of (i) the interphase interactions between matrix and filler, and (ii) the degree of filler agglomeration. For the GNP-based systems, an almost constant conductivity value was observed for all compositions upon cooling, something not observed for the CB-based compositions. These conductivity changes reflect structural and morphological changes that can be associated with positive and negative thermal expansion coefficients. GNP-based systems were observed to exhibit a percolation threshold of approximately 2.2 vol%, lower than the 4.4 vol% observed for the CB-based systems.

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