Molecular engineering of a polyimide copolymer enables excellent dielectric and energy storage performance

Peng, Xiaoniu; Liu, Huiping; Zhu, Zewei; Xu, Tao; Zhou, Gangyong; Zhou, Wei; Bai, Jing; Hou, Haoqing; Peng, Xinwen

doi:10.1039/d3nj01125a

Cited by 3 publications

(3 citation statements)

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“…Because of the decrease in polarization, their energy loss caused by thermal motion under the influence of an electric field force decrease, so there is a corresponding decrease in dielectric loss. [ 49 , 50 , 51 ] Notably, the dielectric loss of ANF‐BSNs composite nanopapers is significantly decreased to 0.13 (at 10 4 Hz) when the BSNs content is merely 5.0 wt%. The excellent property of low dielectric loss can be attributed to the dense and interconnected layered “brick‐and‐mortar” structure in ANF‐BSNs composite nanopapers and excellent interfacial adhesion between BSNs and ANF.…”

Section: Resultsmentioning

confidence: 99%

Novel Fabrication of Basalt Nanosheets with Ultrahigh Aspect Ratios Toward Enhanced Mechanical and Dielectric Properties of Aramid Nanofiber‐Based Composite Nanopapers

Ji,

Song,

Lyu

et al. 2023

Advanced Science

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The rapid development of modern electrical equipment has led to urgent demands for electrical insulating materials with mechanical reliability and excellent dielectric properties. Herein, basalt nanosheets (BSNs) with high aspect ratios (≈780.1) are first exfoliated from basalt scales (BS) through a reliable chemical/mechanical approach. Meanwhile, inspired by the layered architecture of natural nacre, nacre‐mimetic composite nanopapers are reported containing a 3D aramid nanofibers (ANF) framework as a matrix and BSNs as ideal building blocks through vacuum‐assisted filtration. The as‐prepared ANF‐BSNs composite nanopapers exhibit considerably enhanced mechanical properties with ultralow BSNs content. These superiorities are wonderfully integrated with exceptional dielectric breakdown strength, prominent volume resistivity, and extremely low dielectric constant and loss, which are far superior to conventional nacre‐mimetic composite nanopapers. Notably, the tensile strength and breakdown strength of ANF‐BSNs composite nanopapers with a mere 1.0 wt% BSNs reach 269.40 MPa and 77.91 kV mm−1, respectively, representing an 87% and 133% increase compared to those of the control ANF nanopaper. Their properties are superior to those of previously reported nacre‐mimetic composite nanopapers and commercial insulating micropapers, indicating that ANF‐BSNs composite nanopapers are a highly promising electrical insulating material for miniaturized high‐power electrical equipment.

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Section: Resultsmentioning

confidence: 99%

Novel Fabrication of Basalt Nanosheets with Ultrahigh Aspect Ratios Toward Enhanced Mechanical and Dielectric Properties of Aramid Nanofiber‐Based Composite Nanopapers

Ji,

Song,

Lyu

et al. 2023

Advanced Science

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“…Polymer dielectric capacitors are widely used in electrical energy conversion and storage systems because of their flexibility, low cost, high operating voltage, corrosion resistance, and self-healing properties. 1–10 However, the low dielectric constant (<10) of polymers leads to low energy density, thus the polymer dielectric capacitors would account for a large volume proportion in practical applications. 11 Moreover, polymer dielectrics are usually poorly resistant to high temperature.…”

Section: Introductionmentioning

confidence: 99%

Research on the energy storage performance of laminated composites based on multidimensional co-design in a broad temperature range

Tan,

Deng,

Gao

et al. 2024

Nanoscale

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“…Molecular structure modification leads to the enhancement in the dielectric strength of the matrix, but the nature of the different groups may cause the deterioration of the mechanical properties, thermal stability, etc., of the composite films [ 25 , 26 , 27 , 28 , 29 , 30 , 31 ]. Xuehui Peng [ 32 ] synthesized a novel polyimide copolymer (ZnTPP-PI) based on a combination of molecular engineering and co-polymerization methods by introducing zinc hyperconjugated tetraphenyl porphyrin units into the molecular backbone, which achieved an increase in the breakdown strength (216.1 kV/mm).…”

Section: Introductionmentioning

confidence: 99%

Study of the Dielectric and Corona Resistance Properties of PI Films Modified with Fluorene Moiety/Aluminum Sec-Butoxide

Zhang,

Liu,

Tang

et al. 2024

Polymers

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With the policy tilt and increased investment in research and development in the world, new energy vehicle technology continues to progress and the drive motor power density continues to improve, which puts forward higher requirements for the comprehensive performance of the core insulating material enameled wire enamel for drive motors. Polyimide (PI) has excellent electrical insulation properties, and heat resistance is often used to drive the motor winding insulation. To further improve the corona resistance and insulating properties of PI wire enamel varnish, in this paper, firstly, fluorene groups with a rigid conjugated structure were introduced into the molecular chain of the PI film by molecular structure modulation, and then uniformly dispersed alumina nanoclusters (AOCs) were introduced into the PI matrix by using an in situ growth process to inhibit the migration of high-energy electrons. The quantum size effect of the alumina nanoclusters was exploited to synergistically enhance the suppression and scattering of energetic moving electrons by PI-based composite films. The results show that the breakdown field strength of the PI-based composite film (MPI/1.0 vol% AOC) reaches 672.2 kV/mm, and the corona resistance life reaches 7.9 min, which are, respectively, 1.55 and 2.19 times higher than those of the initial PI film. A PI-based composite film with excellent insulating and corona resistance properties was obtained.

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Molecular engineering of a polyimide copolymer enables excellent dielectric and energy storage performance

Abstract: Polyimide dielectric materials with high discharge energy density (Ud) are of considerable interest for the microminiaturization and high integration of electronic devices. Herein, a novel polyimide copolymer (ZnTPP-PI) was synthesized...

Cited by 3 publications

References 50 publications

Novel Fabrication of Basalt Nanosheets with Ultrahigh Aspect Ratios Toward Enhanced Mechanical and Dielectric Properties of Aramid Nanofiber‐Based Composite Nanopapers

Novel Fabrication of Basalt Nanosheets with Ultrahigh Aspect Ratios Toward Enhanced Mechanical and Dielectric Properties of Aramid Nanofiber‐Based Composite Nanopapers

Research on the energy storage performance of laminated composites based on multidimensional co-design in a broad temperature range

Study of the Dielectric and Corona Resistance Properties of PI Films Modified with Fluorene Moiety/Aluminum Sec-Butoxide

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