Thermally conductive polyvinyl alcohol composite films via introducing hetero-structured MXene@silver fillers  

作　　者：Mukun Li Yuyao Sun Dianying Feng Kunpeng Ruan Xia Liu Junwei Gu 

机构地区：[1]Queen Mary University of London Engineering School,Northwestern Polytechnical University,Xi’an 710072,China [2]Shaanxi Key Laboratory of Macromolecular Science and Technology,School of Chemistry and Chemical Engineering,Northwestern Polytechnical University,Xi’an 710072,China [3]Shandong Nonmetallic Materials Institute,Jinan 250031,China

出　　处：《Nano Research》2023年第5期7820-7828,共9页纳米研究（英文版）

基　　金：the National Natural Science Foundation of China(Nos.U21A2093 and 51973173);the Technological Base Scientific Research Projects(Highly Thermally Conductive Nonmetal Materials);the Fundamental Research Funds for the Central Universities,the Undergraduate Innovation&Business Program in Northwestern Polytechnical University(Nos.S202210699381 and S202210699172);the Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University(No.CX2022073).

摘　　要：Ag nanoparticles were in-situ grown on the surface of MXene nanosheets to prepare thermally conductive hetero-structured MXene@Ag fillers.With polyvinyl alcohol(PVA)as the polymer matrix,thermally conductive MXene@Ag/PVA composite films were fabricated by the processes of solution blending,pouring,evaporative self-assembly.With the same mass fraction,MXene@Ag-III(MXene/Ag,2:1,w/w)presents more significant improvement in thermal conductivity coefficient(λ)than MXene@Ag,single MXene,Ag,simply blending MXene/Ag.MXene@Ag-III/PVA composite films show dual functions of excellent thermal conductivity and electromagnetic interference(EMI)shielding.When the mass fraction of MXene@Ag-III is 60 wt.%,the in-planeλ(λ_(∥)),through-planeλ(λ_(⊥)),EMI shielding effectiveness(EMI SE)are 3.72 and 0.41 W/(m∙K),32 dB,which are increased by 3.1,1.3,105.7 times than those of pure PVA film(0.91 and 0.18 W/(m∙K),0.3 dB),respectively.The 60 wt.%MXene@Ag-III/PVA composite film also has satisfying mechanical and thermal properties,with Young’s modulus,glass transition temperature,heat resistance index of 3.8 GPa,58.5 and 175.3℃,respectively.

关 键 词：hetero-structured MXene@Ag fillers polyvinyl alcohol composite films thermal conductivity electromagnetic interference shielding 

分 类 号：TB383[一般工业技术—材料科学与工程]