Bioinspired
Modification of h‑BN for High Thermal Conductive Composite
Films with Aligned Structure
- Publication date
- Publisher
Abstract
With the development of microelectronic
technology, the demand of insulating electronic encapsulation materials
with high thermal conductivity is ever growing and much attractive.
Surface modification of chemical inert h-BN is yet a distressing issue
which hinders its applications in thermal conductive composites. Here,
dopamine chemistry has been used to achieve the facile surface modification
of h-BN microplatelets by forming a polydopamine (PDA) shell on its
surface. The successful and effective preparation of h-BN@PDA microplatelets
has been confirmed by SEM, EDS, TEM, Raman spectroscopy, and TGA investigations.
The PDA coating increases the dispersibility of the filler and enhances
its interaction with PVA matrix as well. Based on the combination
of surface modification and doctor blading, composite films with aligned
h-BN@PDA are fabricated. The oriented fillers result in much higher
in-plane thermal conductivities than the films with disordered structures
produced by casting or using the pristine h-BN. The thermal conductivity
is as high as 5.4 W m<sup>–1</sup> K<sup>–1</sup> at
10 vol % h-BN@PDA loading. The procedure is eco-friendly, easy handling,
and suitable for the practical application in large scale