Funct. Mater. 2020; 27 (3): 500-507.
Influence of the type of filler distribution on the electrical and thermal conductivity of metal-filled polymer composite
1T.Shevchenko National University of Kyiv, 4 Hlushkova Ave., 03022 Kyiv, Ukraine
2Institute of Macromolecular Chemistry, National Academy of Sciences of Ukraine, 48 Kharkivs'ke Shose, 02160 Kyiv, Ukraine
The electrical and thermal conductivity of the composite based on low density polyethylene filled with dispersed copper are investigated in a wide concentration range. The composite with random (R) and segregated (S) types of the filler distribution are studied. The electrical conductivity of the composites demonstrates the percolation behavior, with the value of the percolation threshold equals to 23.0 vol.% and 3.3 vol.% for the R-type and S-type, respectively. A segregated system is characterized by higher conductivity due to the high local filler concentration in the wall of framework. The concentration dependences of the density and thermal conductivity for the segregated system show a similar behavior: they increase to the value of the packing factor, followed by reaching a plateau. The thermal conductivity of the R-type composite was described using the Lichtenecker model and the value of thermal conductivity parameter of the dispersed phase λf = 69 W/(mK) in the composite was found. The S-type composite is characterized by higher thermal conductivity than the R-type composite at the same filler concentration.
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