Coaxial Wet Spinning of Boron Nitride Nanosheet‑Based Composite Fibers with Enhanced Thermal Conductivity and Mechanical Strength  

作　　者：Wenjiang Lu Qixuan Deng Minsu Liu Baofu Ding Zhiyuan Xiong Ling Qiu 

机构地区：[1]Tsinghua Shenzhen International Graduate School(TSIGS),Tsinghua University,Shenzhen 518055,People’s Republic of China [2]Monash Suzhou Research Institute(MSRI),Monash University,Suzhou 215000,People’s Republic of China [3]Faculty of Materials Science and Engineering/Institute of Technology for Carbon Neutrality,Shenzhen Institute of Advanced Technology,Chinese Academy of Sciences,Shenzhen 518055,People’s Republic of China [4]Shenzhen Key Laboratory of Energy Materials for Carbon Neutrality,Shenzhen 518055,People’s Republic of China [5]School of Light Industry and Engineering,South China University of Technology,Guangzhou 510614,People’s Republic of China

出　　处：《Nano-Micro Letters》2024年第2期126-138,共13页纳微快报（英文版）

基　　金：This work was supported by the National Key Research and Development Project(Nos.2019YFA0705403,2022YFA1205300);the National Natural Science Foundation of China(No.T2293693);the Guangdong Innovative and Entrepreneurial Research Team Program(No.2017ZT07C341);the Guangdong Basic and Applied Basic Research Foundation(No.2020B0301030002);the Shenzhen Basic Research Project(Nos.WDZC20200824091903001,JSGG20220831105402004);Zhiyuan Xiong thanks the financial support from South China University of Technology.

摘　　要：Hexagonal boron nitride nanosheets(BNNSs)exhibit remarkable thermal and dielectric properties.However,their self-assembly and alignment in macroscopic forms remain challenging due to the chemical inertness of boron nitride,thereby limiting their performance in applications such as thermal management.In this study,we present a coaxial wet spinning approach for the fabrication of BNNSs/polymer composite fibers with high nanosheet orientation.The composite fibers were prepared using a superacid-based solvent system and showed a layered structure comprising an aramid core and an aramid/BNNSs sheath.Notably,the coaxial fibers exhibited significantly higher BNNSs alignment compared to uniaxial aramid/BNNSs fibers,primarily due to the additional compressive forces exerted at the core-sheath interface during the hot drawing process.With a BNNSs loading of 60 wt%,the resulting coaxial fibers showed exceptional properties,including an ultrahigh Herman orientation parameter of 0.81,thermal conductivity of 17.2 W m^(-1)K^(-1),and tensile strength of 192.5 MPa.These results surpassed those of uniaxial fibers and previously reported BNNSs composite fibers,making them highly suitable for applications such as wearable thermal management textiles.Our findings present a promising strategy for fabricating high-performance composite fibers based on BNNSs.

关 键 词：Boron nitride nanosheets Coaxial fiber Interfacial compression Nanosheet aligning Wearable thermal management 

分 类 号：TQ340.64[化学工程—化纤工业] TB383.1[一般工业技术—材料科学与工程]