Enhancing the thermal conductivity of nanofibrillated cellulose films with 1D BN belts formed by in-situ generation and sintering of BN nanosheets  

作　　者：Baokai Wang Zheng Zhao Mengyi Li Mengyang Niu Jialu Tian Chang Yu Shiqin Wan Ming Yue Weiwei Xuan Wenbin Cao Zhaobo Tian Kexin Chen Qi Wang 

机构地区：[1]School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China [3]School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China [4]School of Microelectronics,Southern University of Science and Technology,Shenzhen 518055,China [5]State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《Journal of Advanced Ceramics》2023年第12期2257-2270,共14页先进陶瓷（英文）

基　　金：This work was supported by the Young Elite Scientists Sponsorship Program by CAST(No.2022QNRC001);the Interdisciplinary Research Project for Young Teachers of USTB(Fundamental Research Funds for the Central Universities)(No.FRF-IDRY-22-022).

摘　　要：The rapid miniaturization and high integration of modern electronic devices have brought an increasing demand for polymer-based thermal management materials with higher thermal conductivity.Boron nitride nanosheets(BNNs)have been widely used as thermally conductive fillers benefiting from the extremely high intrinsic thermal conductivity.However,the small lateral size and weak interface bonding of BNNs enabled them to only form thermally conductive networks through physical overlap,resulting in high interfacial thermal resistance.To address this issue,an innovative strategy based on interface engineering was proposed in this study.High-aspect-ratio boron nitride belts(BNbs)were successfully synthesized by carbon thermal reduction nitridation method through the in-situ generation and sintering of BNNs.The surface of BNb showed the sintering of numerous smaller-sized BNNs,which precisely addresses the issue of weak interfacial bonding between BNNs.On this basis,the as-synthesized BNbs were combined with nano-fibrillated cellulose(NFC)to prepare NFC/BNb composite films through a facile vacuum filtration process.Due to the thermally conductive network formed by the horizontal oriented arrangement of BNb and their particular morphological advantages,the NFC/BNb films demonstrated significantly higher in-plane thermal conductivity than that of NFC/BNNs films,achieving the highest value of 19.119 W·m^(−1)·K^(−1) at a 20 wt%filling fraction.In addition,the NFC/BNb films also exhibited superior thermal stability,mechanical strength,flexibility,and electrical insulation performance,suggesting the significant application potential of the designed BNb fillers in the thermal management field.

关 键 词：boron nitride(BN) thermal management materials vacuum filtration flexible thermally conductive films 

分 类 号：TN04[电子电信—物理电子学] TQ174.758.12[化学工程—陶瓷工业] TB332[化学工程—硅酸盐工业]