BN Nanosheet/Polymer Films with Highly Anisotropic Thermal Conductivity for Thermal Management Applications

Abstract

The development of advanced thermal transport materials is a global challenge. Two-dimensional nanomaterials have been demonstrated as promising candidates for thermal management applications. Here, we report a boron nitride (BN) nanosheet/polymer composite film with excellent flexibility and toughness prepared by vacuum-assisted filtration. The mechanical performance of the composite film is highly flexible and robust. It is noteworthy that the film exhibits highly anisotropic properties, with superior in-plane thermal conductivity of around 200 W m K and extremely low through-plane thermal conductivity of 1.0 W m K, making this material an excellent candidate for thermal management in electronics. Importantly, the composite film shows fire-resistant properties. The newly developed unconventional flexible, tough, and refractory BN films are also promising for heat dissipation in a variety of applications.

An overview of boron nitride based polymer nanocomposites

“…[128] By vacuum-assisted filtration (VAF) Yuanpeng Wu and coworkers fabricated BN/PDDA nanocomposite with excellent flexibility and toughness. [129] Facile vacuumassisted filtration method was adopted by Xiaoliang Zeng et al for the preparation of cellulose nanofiber (CNF)/ BNNT nanocomposites with promising applications in thermal interface materials, printed circuit boards or organic substrates in electronics. [130] PCL/BNNP nanocomposites were synthesized by Li Hao and coworkers using co-precipitation technique.…”

Electrospun Silk-Boron Nitride Nanofibers with Tunable Structure and Properties

“…It was found that the thermal conductivity of silk can be improved by increasing the crystallinity of silk proteins, although it is still much lower than many inorganic materials [24][25][26]. On the other hand, boron nitride (BN) nanomaterials have excellent thermal stability, thermal conductivity, and stable chemical properties, and have long-term good insulation properties [27][28][29][30]. Cell and animal experiments have also shown that boron nitride is not cytotoxic in the proper dosage range and does not have any negative effects on animal signs, which indicates that boron nitride is also biocompatible [31][32][33].…”

Synergistic effects on the enhancement of thermal conductive properties of thermal greases

“…The FTIR spectra of dried h‐BN, HPC, and GF are shown in Figure . The two strong characteristic absorption peaks of h‐BN can be attributed to the B‐N stretching vibrations at around 1374 cm −1 and blending vibration at around 818 cm −1 . For HPC, the broad peak from 3700 cm −1 to 3100 cm −1 is associated with the presence of hydroxyl groups.…”