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- Title
Bioinspired Dielectric Film with Superior Mechanical Properties and Ultrahigh Electric Breakdown Strength Made from Aramid Nanofibers and Alumina Nanoplates.
- Authors
Qing, Qiu-Wanyu; Wei, Cheng-Mei; Li, Qi-Han; Liu, Rui; Zhang, Zong-Xi; Ren, Jun-Wen
- Abstract
Materials with excellent thermal stability, mechanical, and insulating properties are highly desirable for electrical equipment with high voltage and high power. However, simultaneously integrating these performance portfolios into a single material remains a great challenge. Here, we describe a new strategy to prepare composite film by combining one-dimensional (1D) rigid aramid nanofiber (ANF) with 2D alumina (Al2O3) nanoplates using the carboxylated chitosan acting as hydrogen bonding donors as well as soft interlocking agent. A biomimetic nacreous 'brick-and-mortar' structure with a 3D hydrogen bonding network is constructed in the obtained ANF/chitosan/Al2O3 composite films, which provides the composite films with exceptional mechanical and dielectric properties. The ANF/chitosan/Al2O3 composite film exhibits an ultrahigh electric breakdown strength of 320.1 kV/mm at 15 wt % Al2O3 loading, which is 50.6% higher than that of the neat ANF film. Meanwhile, a large elongation at break of 17.22% is achieved for the composite film, integrated with high tensile strength (~233 MPa), low dielectric loss (<0.02), and remarkable thermal stability. These findings shed new light on the fabrication of multifunctional insulating materials and broaden their practical applications in the field of advanced electrics and electrical devices.
- Subjects
ELECTRIC breakdown; ELECTRIC properties; DIELECTRIC properties; DIELECTRIC loss; NANOFIBERS; ALUMINUM oxide; BIOMIMETIC materials; DIELECTRIC films
- Publication
Polymers (20734360), 2021, Vol 13, Issue 18, p3093
- ISSN
2073-4360
- Publication type
Article
- DOI
10.3390/polym13183093