Chemo-Mechanically Exfoliated Boron Nitride Nanosheet/Poly(Vinyl Alcohol) Composites as Efficient Heat Dissipation Components

Advanced heat dissipation materials are necessary for powerful and miniaturized electronics. Hexagonal boron nitride (h-BN) is an ideal material for thermal management due to its electrical insulation but thermal conductivity. However, its utilization is seriously restricted by the pulverulence, and multilayer and chemical inertness. Herein, highly functionalized BN nanosheets (BNNSs) are exfoliated by a boric acid-assisted chemo-mechanical method and show stable dispersion in various solvents. An ingenious chemical etch- and mechanical force-induced exfoliation and functionalization mechanism is proposed. Due to the existence of strong interfacial interaction between BNNSs and poly(vinyl alcohol) (PVA), a series of composite films with excellent thermal stability, low dielectric constant (2–4), negligible dissipation factor (