BP powders with high thermal conductivity were synthesized by a facile molten salt method and used as thermal conductive fillers to prepare nanofibrillated cellulose composite film with higher thermal conductivity.
With
the miniaturization and high integration development
in microelectronic
devices, the problem of heat dissipation has attracted widespread
attention. Highly thermal conductive and electrical insulation polymer
composites show great advantages to solve the problems of heat dissipation.
Nevertheless, the fabrication of polymer composites with both excellent
thermal conductivity and electrical performance is still a great challenge.
Herein, to coordinate the thermal and electrical properties of the
composite film, the sandwich-structured poly(vinyl alcohol) (PVA)/boron
phosphide (BP)-boron nitride nanosheet (BNNS) composite films were
prepared, with the PVA/BP composite film as the top and bottom layers
and the BNNS layer as the middle layer. When the filler loading was
31.92 wt %, the sandwich-structured composite films showed excellent
in-plane thermal conductivity (9.45 W·m–1·K–1), low dielectric constant (1.25 at 102 Hz), and excellent breakdown strength. In the composite film, the
interconnected BP particles and BNNS layer formed several heat dissipation
pathways to increase the thermal conductivity, while the insulated
BNNS layer hampered the electron transformation to enhance the electrical
resistivity of films. Therefore, the PVA/BP-BNNS composite films showed
a potential application in heat dissipation of high power electronic
devices.
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