Synergistic Improvement of Dielectric and Thermal Conductivity Properties for Polymers Filled with Multifunctional Modified Nanowires

被引:7
作者
Li, Guan [1 ]
Gao, Ying [1 ]
Liu, Huijing [1 ]
Xu, Haiping [1 ,3 ]
Xiong, Wei [4 ]
Guo, Lihe [1 ]
Li, Hongfei [1 ]
Chen, George [2 ]
机构
[1] Shanghai Polytech Univ, Sch Energy & Mat, Shanghai Key Lab Engn Mat Applicat & Evaluat, Shanghai 201209, Peoples R China
[2] Univ Southampton, Dept Elect & Comp Sci, Southampton SO17 1BJ, England
[3] Shanghai Engn Res Ctr Adv Thermal Funct Mat, Shanghai Thermophys Properties Big Data Profess Te, Shanghai 201209, Peoples R China
[4] Shanghai Repoly Environm Protect Technol Co Ltd, Shanghai 201209, Peoples R China
基金
中国国家自然科学基金;
关键词
core-shell nanofiller; aspect ratio; dielectric property; thermal conductivity; permeabilitythreshold; ENERGY DENSITY; COMPOSITES; NANOCOMPOSITES;
D O I
10.1021/acsami.3c13359
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Dielectric composites are widely used in power electronics, power systems, aerospace, and other fields due to their extremely high power density. However, if their energy density can be further increased, the application range will be greatly improved. Improving the dielectric constant of composites is one of the most effective ways to increase the energy density. In this study, a preparation method for copper calcium titanate nanowires (CCTO-NWs) with adjustable aspect ratio was investigated. Upon incorporation of these CCTO-NWs into the polymer matrix, the nanocomposites exhibit a significantly higher dielectric constant and a lower dielectric loss. In addition, a thin layer of Al2O3 with excellent thermal conductivity is coated on the surface of the CCTO-NWs to form a core-shell structure nanowire CCTO-NW@Al2O3. The introduction of the thermal conductive layer of Al2O3 not only creates a continuous heat transfer path within the dielectric composite, increasing the thermal conductivity of the composite from 0.11 W/(m<middle dot>K) of pure HIPS to 1.12 W/(m<middle dot>K), but also serves as a buffer layer between HIPS and CCTO-NWs, effectively alleviating the electric field distortion caused by the large difference in the dielectric constant between them, thereby optimizing the dielectric properties of the composite and reducing the dielectric permeability threshold from 30 to 20 vol %. This work provides an effective strategy for synergistically improving the dielectric constant and thermal conductivity of dielectric composites while also taking into account the good flexibility of polymer/ceramic nanocomposites.
引用
收藏
页码:58828 / 58838
页数:11
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