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Bioinspired Modification of h‑BN for High Thermal Conductive Composite Films with Aligned Structure
发布时间:2015-4-10 点击次数:793次

Bioinspired Modification of hBN for High Thermal Conductive Composite Films with Aligned Structure

With the development of microelectronic technology, the demandof insulating electronic encapsulation materials with high thermal conductivity isever growing and much attractive. Surface modification of chemical inert h-BN isyet a distressing issue which hinders its applications in thermal conductivecomposites. Here, dopamine chemistry has been used to achieve the facile surfacemodification of h-BN microplatelets by forming a polydopamine (PDA) shell onits surface. The successful and eective preparation of h-BN@PDA microplateletshas been confirmed by SEM, EDS, TEM, Raman spectroscopy, and TGAinvestigations. The PDA coating increases the dispersibility of the filler andenhances its interaction with PVA matrix as well. Based on the combination ofsurface modification and doctor blading, composite films with aligned h-BN@PDA are fabricated. The oriented fillers result in much higher in-plane thermalconductivities than the films with disordered structures produced by casting or using the pristine h-BN. The thermal conductivityis as high as 5.4 W m−1

K−1at 10 vol % h-BN@PDA loading. The procedure is eco-friendly, easy handling, and suitable for thepractical application in large scale.



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