Carbon black/graphite nanoplatelet/rubbery epoxy hybrid composites for thermal interface applications |
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Authors: | Mohsin Ali Raza Aidan Westwood Chris Stirling |
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Affiliation: | (1) Institute for Materials Research, University of Leeds, Leeds, LS2 9JT, UK;(2) Morgan AM&T, Swansea, SA6 8PP, UK |
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Abstract: | Hybrid composites were developed by dispersing carbon black (CB) nanoparticles and graphite nanoplatelets (GNPs) at 4–6 and
12–14 wt%, respectively, into rubbery epoxy resin. SEM analysis showed that CB particles improved the dispersion of GNPs in
the hybrid composite. The thermal conductivity of 4 wt% CB/14 wt% GNP-15/rubbery epoxy hybrid composite, 0.81 W/m K, is ca.
four times higher than that of rubbery epoxy. When silane-functionalised, the fillers reduced the viscosity of the hybrid
dispersion and made the hybrid composite highly electrically insulating. Nevertheless, filler functionalisation decreased
the composite’s thermal conductivity by only 16.6%. Compression testing showed that the hybrid fillers increased the compressive
modulus and strength of rubbery epoxy by nearly two and three times, respectively. Overall, the hybrid composites with their
thermal paste-type morphology, low viscosity, high compliance, improved thermal conductivity and, when fillers are functionalised,
low electrical conductivity makes them promising materials as thermal interface adhesives. |
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