Synergistic enhancement of thermal conductivity in polymer composites filled with self-hybrid expanded graphite fillers

Authors
Kim, Hyun SuNa, Jung HyunJung, Yong ChaeKim, Seong Yun
Issue Date
2016-10-15
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF NON-CRYSTALLINE SOLIDS, v.450, pp.75 - 81
Abstract
The size of expanded graphite (EG) was controlled using a high-speed crusher because a hybrid of differently sized fillers can induce a synergistic enhancement of the thermal conductivity in polymer composites. We found that the thermal conductivity of a polymer composite filled with both 10 wt% EG and 10 wt% high-speed crusher treated EG (wEG) was synergistically improved by 12.0 and 20.7% compared to that of polymer composites filled with 20 wt% EG and 20 wt% wEG alone, respectively. A three-dimensional (3D) non-destructive analysis using X-ray micro-computed tomography (micro-CT) was applied to explain the synergistic enhancement and to identify the dispersion and 3D network of EG fillers in the composites accurately. According to the non-destructive analysis results, the synergistic enhancement was caused by the formation of efficient thermally conductive pathways due to the hybrid of the differently sized EG and wEG fillers. (C) 2016 Elsevier B.V. All rights reserved.
Keywords
WALLED CARBON NANOTUBES; GRAPHENE NANOPLATELETS; THERMOPLASTIC COMPOSITES; ELECTRICAL PERCOLATION; THEORETICAL APPROACH; HEAT-FLOW; NANOCOMPOSITES; DISPERSION; IMPROVEMENT; BEHAVIOR; WALLED CARBON NANOTUBES; GRAPHENE NANOPLATELETS; THERMOPLASTIC COMPOSITES; ELECTRICAL PERCOLATION; THEORETICAL APPROACH; HEAT-FLOW; NANOCOMPOSITES; DISPERSION; IMPROVEMENT; BEHAVIOR; Polymer composite; Thermal conductivity; X-ray micro computed tomography; Expanded graphite
ISSN
0022-3093
URI
https://pubs.kist.re.kr/handle/201004/123561
DOI
10.1016/j.jnoncrysol.2016.07.038
Appears in Collections:
KIST Article > 2016
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