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Size‐Dependent Electrical and Thermal Properties of Onion‐Like Carbons/Polyurethane Composites
Author(s) -
Kranauskaite Ieva,
Macutkevic Jan,
Banys Juras,
Kuznetsov Vladimir,
Letellier Maxime,
Fierro Vanessa,
Celzard Alain,
Shenderova Olga
Publication year - 2018
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.24816
Subject(s) - materials science , composite material , percolation threshold , composite number , dielectric , polyurethane , thermal diffusivity , percolation (cognitive psychology) , electrical resistivity and conductivity , thermal conductivity , aggregate (composite) , optoelectronics , quantum mechanics , neuroscience , electrical engineering , biology , engineering , physics
Results of dielectric/electrical studies of onion‐like carbon (OLC)/polyurethane composite films in very broad frequency (20 Hz–3 THz) and temperature (26–300 K) ranges are presented. We show that the percolation threshold in these composites strictly depends on OLC aggregate size and is lower for composites having smaller OLC aggregates. The electrical conductivity in the composites is mainly due to electron tunneling between OLC clusters and quasi‐one‐dimensional hopping inside the clusters. The thermal diffusivity increases with OLC concentration and, as for electrical conductivity, is the highest for composites having the smallest OLC aggregates. POLYM. COMPOS., 39:E1834–E1840, 2018. © 2018 Society of Plastics Engineers