With the advent of the 5G era, the efficient and large-scale preparation of high thermal conductivity materials is viewed as a challenge in the heat conduction and dissipation of electronic components. In this work, poly (diallyl dimethyl ammonium chloride) (PDDA) was used to combine nanodiamond (ND) particles with boron nitride nanosheets (BNNS) by electrostatic interactions. The filler and polyvinyl alcohol (PVA) were mixed to prepare a large-area, flexible, insulating, and high thermal conductivity composite film by the doctor blade method. Considering the high cost of ND, when keeping the filler content at 30 wt%, the introduction of few ND on BNNS (ND/BNNS, 3/100, w/w) enhanced the in-plane thermal conductivity of the composite film from 11.29 to 15.49 W/m·K (pure PVA film~0.22 W/m·K). Given these advantages, this composite film shows promising applications in next-generation portable and flexible electronic devices.

随着5G时代的到来，高导热率材料的高效，大规模制备被视为电子元件导热和散热方面的挑战。在这项工作中，聚二烯丙基二甲基氯化铵（PDDA）用于通过静电相互作用将纳米金刚石（ND）颗粒与氮化硼纳米片（BNNS）结合在一起。通过刮刀法将填料和聚乙烯醇（PVA）混合以制备大面积，柔性，绝缘且高导热率的复合膜。考虑到ND的高成本，当将填料含量保持在30 wt％时，在BNNS上引入少量ND（ND / BNNS，3/100，w / w）可使复合膜的面内导热系数从11.29提高至15.49 W / m·K（纯PVA膜〜0.22 W / m·K）。有了这些优势，