Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 186, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2019.107917
Keywords
Functional composites; Thermal properties; Mechanical properties
Categories
Funding
- Major International (Regional) Joint Research Project of the National Science Foundation of China [51210004]
- Technological Innovation Project of Hubei Province of China [2017AAA016]
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Constructing thermal conductive pathways is an effective route to increase the thermal conductivity of thermal interface materials (TIMs). Asphalt/styrene-butadiene-styrene tri-block copolymer (SBS)/alumina composites with alumina micro-particles selectively distributed in SBS (denoted as asphalt/SBS/sd-Al2O3) were fabricated through pre-dispersion of alumina micro-particles in SBS, followed by compounding with asphalt. The effects of alumina distribution on the rheological, mechanical and thermal conductive properties of the asphalt-based composites were systematically studied. Compared with the composites with randomly distributed alumina, i. e., asphalt/SBS/rd-Al2O3, those with selectively and homogeneously distributed alumina micro-particles in SBS formed a continuous thermal conductive SBS/alumina network. Therefore, the asphalt/SBS/sd-Al2O3 composites displayed maximum thermal conductivity enhancement of similar to 35% at 30 vol% alumina. At 50 vol% alumina, the thermal conductivity of the asphalt/SBS/sd-Al2O3 composites reached similar to 0.99 W/mK, which is 400% higher than that of the asphalt/SBS blend (0.20 W/mK). Also, the asphalt/SBS/sd-Al2O3 composites possessed higher values of storage modulus, tensile strength and softening point. This work has provided a promising approach to fabricate high-performance and low-cost TIMs.
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