Enhanced thermal conductivity of benzoxazine nanocomposites based on non-covalent functionalized hexagonal boron nitride

Publication date: Available online 16 July 2019Source: Composites Science and TechnologyAuthor(s): Lin Chen, Kui Li, Bo Li, Dengxun Ren, Sijing Chen, Mingzhen Xu, Xiaobo LiuAbstractHigh thermal conductivity composites with ideal electrical properties have a wide potential application of electronic packaging systems in aerospace, electrical and electronic fields. Hexagonal boron nitride (h-BN) has been widely used in heat conduction systems due to its good insulation and thermally conductivity. However, its application has been limited due to its surface inertness and low strength. In this work, dopamine (DA) was used to provide a polymer coating (PDA) in the hexagonal boron nitride (h-BN) surface to improve its uniform dispersion and interfacial compatibility in the polymer matrix (A-ph/CE). Polymer nanocomposites with different nanofiller loadings were prepared by simple curing casting procedure. Among them, the thermal conductivity of A-ph/CE/h-BN@PDA nanocomposites with 20 wt% h-BN@PDA increases to 0.71 W/m⋅K. The thermal conductivity of nanocomposites was predicted by using the classical equation Agari model. With the nanofiller amounts increasing, the thermal stability of the nanocomposites also improved. The thermal decomposition and Tg with A-ph/CE/h-BN@PDA nanocomposites with 20 wt% h-BN@PDA increase to 350.8 °C and 339.9 °C, respectively. And its dynamic storage modulus reaches 7390 Mpa. And the prepared composites had ideal dielectric properties. The d...

Source: Composites Science and Technology - July 16, 2019 Category: Science Source Type: research