Daoming Zhang, Chunhui Bi, Bin Gou, Jiangang Zhou, An Zhong, Baisen Lin, Hangchuan Cai, Congzhen Xie, Huasong Xu, Rui Wang
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引用次数: 0
Abstract
Polymer-based self-adaptive dielectrics are considered promising materials to meet the growing insulation needs of flexible electronic devices and high-voltage DC cables. However, the temperature-sensitive electrical performance and poor thermal management ability of polymer dielectrics are bottlenecks that limit their further development. Here, we report a novel three-dimensional microstructure, i.e., nonlinear silicon carbide (SiC) micromaterials loaded on sodium alginate (SA) aerogel, exhibiting satisfactory non-linear electric conductivity with ultra-high thermal conductivity (3.86 W m−1 K−1, compared to 0.21 W m−1 K−1 of the pure epoxy resin). The SA aerogel, rich in high-density pores, is conductive to SiC forming a highly interconnected network structure under low loading, which endows polymer composites with the ability to quickly disperse charges under high electric field. In addition, the three-dimensional interconnected SiC network can disperse the Joule heat from local currents generated by nonlinear behavior, preventing thermal breakdown caused by the adverse effect of heat accumulation on the electrical properties of the material. In combining the advantages of nonlinear electrical conductivity characteristics, high thermal management ability, and low load capacity, this strategy expands the application scenarios of electric field self-adaptive polymer materials under high-temperature conditions.
Graphical abstract
We report a novel three-dimensional microstructure dielectric composite with self-assembly SiC on sodium alginate aerogel. Due to the high interconnectivity and porous structure of SA aerogel, efficient construction of conducting paths is achieved at a low filler content (1 vol%), which endows the composite with satisfying nonlinear conductivity and thermal management capacity.
聚合物基自适应电介质被认为是满足柔性电子设备和高压直流电缆日益增长的绝缘需求的有前途的材料。然而,聚合物电介质对温度敏感的电气性能和较差的热管理能力是限制其进一步发展的瓶颈。在此,我们报告了一种新型三维微结构,即在海藻酸钠(SA)气凝胶上负载非线性碳化硅(SiC)微材料,该微结构具有令人满意的非线性电导率和超高导热率(3.86 W m-1 K-1,而纯环氧树脂的导热率为 0.21 W m-1 K-1)。SA 气凝胶富含高密度孔隙,在低负载条件下可与 SiC 形成高度互连的网络结构,从而使聚合物复合材料具有在高电场下快速分散电荷的能力。此外,三维互连的 SiC 网络还能分散非线性行为产生的局部电流焦耳热,防止因热量积累对材料电气性能产生不利影响而导致热击穿。该策略结合了非线性导电特性、高热管理能力和低负载能力等优点,拓展了电场自适应聚合物材料在高温条件下的应用场景。由于海藻酸钠气凝胶具有高互联性和多孔结构,因此可以在较低的填料含量(1 vol%)下高效构建导电路径,从而使复合材料具有令人满意的非线性导电性和热管理能力。
期刊介绍:
Advanced Composites and Hybrid Materials is a leading international journal that promotes interdisciplinary collaboration among materials scientists, engineers, chemists, biologists, and physicists working on composites, including nanocomposites. Our aim is to facilitate rapid scientific communication in this field.
The journal publishes high-quality research on various aspects of composite materials, including materials design, surface and interface science/engineering, manufacturing, structure control, property design, device fabrication, and other applications. We also welcome simulation and modeling studies that are relevant to composites. Additionally, papers focusing on the relationship between fillers and the matrix are of particular interest.
Our scope includes polymer, metal, and ceramic matrices, with a special emphasis on reviews and meta-analyses related to materials selection. We cover a wide range of topics, including transport properties, strategies for controlling interfaces and composition distribution, bottom-up assembly of nanocomposites, highly porous and high-density composites, electronic structure design, materials synergisms, and thermoelectric materials.
Advanced Composites and Hybrid Materials follows a rigorous single-blind peer-review process to ensure the quality and integrity of the published work.