Quasi-isotropically Thermoconductive, Antiwear and Insulating Hierarchically Assembled Hexagonal Boron Nitride Nanosheet/epoxy Composites for Efficient Microelectronic Cooling.
Journal of colloid and interface science(2022)
Abstract
Herein, Pebax functionalized h-BNNSs (P-BNNSs) fabricated by a mechanical exfoliation and in-situ modification process are employed to improve the thermal conductivity and antiwear performance of epoxy resin (EP). Pebax can effectively improve the dispersibility of P-BNNSs, achieving hierarchical assembly of P-BNNSs in EP matrix during EP curing process to form a multinetwork structure only at a low P-BNNS filling contents (<6 wt%). This multinetwork structure can act as excellent heat conductive pathways to realize simultaneously vertical and horizontal heat diffusion, obtaining quasi-isotropical thermal conductive P-BNNS/EP composites. Fascinatingly, a through-plane thermal conductivity of 3.9 W/(m center dot K) and an in-plane thermal conductivity of 2.9 W/(m center dot K) are obtained. More importantly, this special structure can simultaneously improve the antiwear, mechanical and electrically insulating performances of pure EP. The friction coefficients and wear rates of P-BNNS/EP composites (P-BNNS contents < 6 wt%) are dramatically decreased to less than 0.2 and 1 x 10-5 mm3/(N center dot m), comparing with those of pure EP which are over 0.6 and 2 x 10-5 mm3/(N center dot m), respectively. The enhanced tensile stress of over 110 MPa and electric volume resistivity of over 1.50 x 1013 X center dot cm are also observed for P-BNNS/EP composite films. These improved properties make the P-BNNS/EP composites very promising as packaging or heat dissipation materials in the high density integration systems and high frequency printed circuit boards. (c) 2021 Published by Elsevier Inc.
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Key words
Hexagonal boron nitride nanosheets,Epoxy resin,Thermal conductivity,Electrical insulation,Antifriction performance
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