Matching micro‐ and nano‐boron nitride hybrid fillers for high‐thermal conductive composites

Abstract

Incorporating hybrid fillers into polymer has been considered as one of the effective ways to obtain composites with high-thermal conductivities (TCs). Herein, we fabricated polytetrafluoroethylene (PTFE) composites by using micro-boron nitride nanosheets (mBNNs) and nano-BNNs (nBNNs) as fillers, and studied the optimum ratios of mBNNs to nBNNs (i.e., mBNNs:nBNNs) for obtaining high-thermal conductive composites at different filler's contents. The results indicated that for the composites with total BNNs contents of 10, 20, and 30 wt%, the optimum mBNNs:nBNNs for obtaining the highest TC were 9:1, 9:1, and 5:5, respectively. The highest TC of the composites with 30 wt% BNNs could reach 1.46 WÁm −1 ÁK −1 , which was 356% higher than that of PTFE. The reasons for optimum mBNNs:nBNNs values were interpreted by observing the composite's microstructures. Moreover, the fabricated composites also exhibited excellent electrical insulation properties. This study has important implications for obtaining high-thermal conductive composites using hybrid fillers.

Highly thermally conductive polymer composite enhanced by constructing a dual thermal conductivity network

“…Figure 4D summarizes the thermal conductivity of polymer composites with BN as a thermally conductive filler reported in recent years and compares it with this paper. [37][38][39][40][41][42][43][44][45] The thermal conductivity of the sample prepared in this paper is significantly better than that reported in other papers under the condition of the same filler load. For composites obtained by physical blending, BN particles are randomly dispersed within the resin matrix, which leads to severe phonon scattering at the "organicinorganic" interface.…”

“…This structure with dual heat transfer channels enables efficient heat transmission. Figure 4D summarizes the thermal conductivity of polymer composites with BN as a thermally conductive filler reported in recent years and compares it with this paper 37–45 . The thermal conductivity of the sample prepared in this paper is significantly better than that reported in other papers under the condition of the same filler load.…”

Research progress in insulating and thermal conductivity of fluorinated graphene and its polyimide composites

“…And an FG concentration of 0.5 wt% was a threshold amount over which the energy storage modulus considerably increased. Co‐doping FG with PI not only did not impair the mechanical properties of the polymer as other thermally conductive fillers do [75, 76] but actually enhanced the mechanical characteristics of the composite films.…”

Significantly Enhancing Mechanical and Thermal Properties of Cellulose-Based Composites by Adding Small Amounts of Lysozyme-Modified Graphene Nanoplatelets via Forming Strong Double-Cross-Linked Interface Interactions

“…Today’s society has entered the 5G era, and efficient thermal management of chips is essential for the stable operation of portable and wearable devices . Nowadays, various new types of composites have been used in the thermal management of integrated chips for improving their heat dissipation, such as polymer-based, , metal-based, , and ceramic-based composites, etc. Among these, cellulose-based composites have attracted broad attention because of their low cost, environmental friendliness, flexibility, and good thermal properties. − Therefore, exploring cellulose-based eco-friendly composites with high thermal conductivity and excellent mechanical properties is important for developing new heat dissipation materials used in the thermal management of chips. , …”