Yi Mingming, Han Meng, Chen Junlin, Hao Zhifeng, Chen Yuanzhou, Yao Yimin, Sun Rong
School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China.
Shenzhen Institute of Advanced Electronic Materials, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China.
Nanomaterials (Basel). 2021 Dec 30;12(1):111. doi: 10.3390/nano12010111.
The high thermal conductivity and good insulating properties of boron nitride (BN) make it a promising filler for high-performance polymer-based thermal management materials. An easy way to prepare BN-polymer composites is to directly mix BN particles with polymer matrix. However, a high concentration of fillers usually leads to a huge reduction of mechanical strength and optical transmission. Here, we propose a novel method to prepare polyethylene/boron nitride nanoplates (PE/BNNPs) composites through the combination of electrostatic self-assembly and hot pressing. Through this method, the thermal conductivity of the PE/BNNPs composites reach 0.47 W/mK, which gets a 14.6% improvement compared to pure polyethylene film. Thanks to the tight bonding of polyethylene with BNNPs, the tensile strength of the composite film reaches 1.82 MPa, an increase of 173.58% compared to that of pure polyethylene film (0.66 MPa). The fracture stress was also highly enhanced, with an increase of 148.44% compared to pure polyethylene film. Moreover, the addition of BNNPs in PE does not highly reduce its good transmittance, which is preferred for thermal management in devices like light-emitting diodes. This work gives an insight into the preparation strategy of transparent and flexible thermal management materials with high thermal conductivity.
氮化硼（BN）的高导热性和良好绝缘性能使其成为高性能聚合物基热管理材料的理想填料。制备BN-聚合物复合材料的一种简便方法是将BN颗粒与聚合物基体直接混合。然而，高浓度的填料通常会导致机械强度和光学透过率大幅降低。在此，我们提出一种通过静电自组装和热压相结合的方法来制备聚乙烯/氮化硼纳米片（PE/BNNPs）复合材料。通过这种方法，PE/BNNPs复合材料的热导率达到0.47W/mK，与纯聚乙烯薄膜相比提高了14.6%。由于聚乙烯与BNNPs紧密结合，复合薄膜的拉伸强度达到1.82MPa，与纯聚乙烯薄膜（0.66MPa）相比提高了173.58%。断裂应力也显著增强，与纯聚乙烯薄膜相比提高了148.44%。此外，在PE中添加BNNPs不会大幅降低其良好的透光率，这对于发光二极管等器件的热管理来说是很理想的。这项工作为制备具有高导热性的透明柔性热管理材料提供了一种制备策略。
