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A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Applications".

Deadline for manuscript submissions: closed (28 February 2022) | Viewed by 27949

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Dr. Shaojian He

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Beijing Key Laboratory of Energy Safety and Clean Utilization, North China Electric Power University, Beijing 102206, China
Interests: polymer insulation materials; high-performance rubber nanocomposites; energy materials
Special Issues, Collections and Topics in MDPI journals

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Dear Colleagues,

We cordially invite you to submit your research papers, communications or review articles to the Special Issue entitled “Polymer Composites for Electrical and Electronic Engineering Application”.

Polymer composite materials have attracted great interest for the development of electrical and electronic engineering and technology, and have been widely applied in electrical power systems, electrical insulation equipment, electrical and electronic devices, etc. Due to the significant expansion in the use of newly developed polymer composite materials, it is necessary to understand and accurately describe the relationship between composite structure and material properties, as only based on thorough laboratory characterization is it possible to estimate the properties for their future commercial applications.

This Special Issue focuses on polymer composites applied in the field of electrical and electronic equipment, including but not limited to synthesis and preparation of new polymeric materials, structure–properties relationship of polymer composites, evaluation of materials application, simulation and modelling of material performance.

We are looking forward to receiving your outstanding work for this Special Issue.

Dr. Shaojian He
Guest Editor

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Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Polymers is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

polymer composite
electrical insulation
electronic materials
electromagnetic shielding
dielectric properties
mechanical properties
heat dissipation
breakdown
aging

Published Papers (14 papers)

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Research

12 pages, 6202 KiB

Open AccessArticle

Electric Field Improvement for High-Voltage Bushings

by Li Li, Qi Li, Shuxin Xu, Rui Liu, Manling Dong, Si Ying, Jieyuan Tian, Wanpeng Xin, Manu Haddad and Xingliang Jiang

Polymers 2023, 15(1), 40; https://0-doi-org.brum.beds.ac.uk/10.3390/polym15010040 - 22 Dec 2022

Viewed by 2499

Abstract

Resin-impregnated paper (RIP) bushing has gained significant interest due to its extended application in Extra High Voltage (EHV) and Ultra High Voltage (UHV) electricity transmission systems. However, the design criterion of its overall structure, the geometry parameters of the condenser layers, and stress release devices, etc., are still not fully understood. This article proposes a unique electric field optimization technique to integrate both the analytical and the numerical methods. The charge simulation method (CSM) is employed to create the overall equipotential surface, within which the finite element analysis (FEA) is adapted to study the localized field enhancement effects, taking into consideration the multi-physics coupled fields. A case study is performed on an actual UHV bushing. The results are compared to the traditional methods, to demonstrate the benefit of the hybrid method. Full article

(This article belongs to the Special Issue Polymer Composites for Electrical and Electronic Engineering Application)

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14 pages, 3362 KiB

Open AccessArticle

Study on Microwave Absorption Performance Enhancement of Metamaterial/Honeycomb Sandwich Composites in the Low Frequency Band

by Songming Li, Hao Huang, Sibao Wu, Jiafu Wang, Haijun Lu and Liying Xing

Polymers 2022, 14(7), 1424; https://0-doi-org.brum.beds.ac.uk/10.3390/polym14071424 - 31 Mar 2022

Cited by 11 | Viewed by 2971

Abstract

With the rapid development of electronic technology and modern radar detection system, there is increasingly urgent demand for microwave absorbing composites working efficiently in the low frequency range (e.g., 1–2 GHz). In this work, a type of metamaterial/honeycomb sandwich composite (MHSC) was proposed and fabricated, which exhibited a light weight structure and excellent wave-absorbing performance in the low frequency band. The relationship between the wave-absorbing properties and the design parameters of the composite, such as the thickness of the wave-transmitting skin, the thickness and dielectric properties of the wave-absorbing honeycomb, was systematically investigated. The electromagnetic coupling interference between the honeycomb absorber and metamaterial resonator proved to be a crucial factor that affects synergistic wave-absorbing performance in the low-frequency band. Under the rational design, the incorporation of subwavelength-sized phase-gradient metamaterial units in the composite can significantly improve low-frequency wave-absorbing performance for greater than 5 dB (an increment larger than 100%); and the obtained MHSC exhibits averaged reflectivity (R_a) less than −10 dB in the low frequency band of 1–2 GHz as well as outstanding performance (R_a < −14.6 dB) over an extremely wide frequency range (1–18 GHz). The MHSC reported in this study could be a promising candidate for the key material in high-performance radar stealth and other related applications. Full article

(This article belongs to the Special Issue Polymer Composites for Electrical and Electronic Engineering Application)

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13 pages, 3609 KiB

Open AccessArticle

Bio-Based Eucommia ulmoides Gum Composites with High Electromagnetic Interference Shielding Performance

by Hailan Kang, Sen Luo, Hongyang Du, Lishuo Han, Donghan Li, Long Li and Qinghong Fang

Polymers 2022, 14(5), 970; https://0-doi-org.brum.beds.ac.uk/10.3390/polym14050970 - 28 Feb 2022

Cited by 9 | Viewed by 2004

Abstract

Herein, high-performance electromagnetic interference (EMI) shielding bio-based composites were prepared by using EUG (Eucommia ulmoides gum) with a crystalline structure as the matrix and carbon nanotube (CNT)/graphene nanoplatelet (GNP) hybrids as the conductive fillers. The morphology of the CNT/GNP hybrids in the CNT/GNP/EUG composites showed the uniform distribution of CNTs and GNPs in EUG, forming a denser filler network, which afforded improved conductivity and EMI shielding effect compared with pure EUG. Accordingly, EMI shielding effectiveness values of the CNT/GNP/EUG composites reached 42 dB in the X-band frequency range, meeting the EMI shielding requirements for commercial products. Electromagnetic waves were mainly absorbed via conduction losses, multiple reflections from interfaces and interfacial dipole relaxation losses. Moreover, the CNT/GNP/EUG composites exhibited attractive mechanical properties and high thermal stability. The combination of excellent EMI shielding performance and attractive mechanical properties render the as-prepared CNT/GNP/EUG composites attractive candidates for various applications. Full article

(This article belongs to the Special Issue Polymer Composites for Electrical and Electronic Engineering Application)

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15 pages, 6696 KiB

Open AccessArticle

Streamer Propagation along the Insulator with the Different Curved Profiles of the Shed

by Xiaobo Meng, Liming Wang, Hongwei Mei, Bin Cao and Xingming Bian

Polymers 2022, 14(5), 897; https://0-doi-org.brum.beds.ac.uk/10.3390/polym14050897 - 24 Feb 2022

Cited by 4 | Viewed by 1171

Abstract

The flashover along the insulator endangers the reliable operation of the electrical power system. The reasonable curved profiles of the shed could improve the flashover voltage, which would reduce power system outages. The research on the influence of the curved profiles of the shed on the streamer propagation along the insulator made of polymer was presented in the paper. The streamer propagation “stability” field, path, and velocity affected by the curved profiles of the shed, were measured by ultraviolet camera, ICCD camera, and photomultipliers. The “surface” component of the streamer is stopped at the shed with the different curved profiles, while the “air” component could go round the shed and reach the cathode. The streamer propagation “stability” fields are inversely proportional to the curved profiles of the shed. The streamer propagation velocities are proportional to the curved profiles of the shed. The relationship between the streamer propagation and the flashover propagation was discussed in depth. The subsequent flashover propagation is greatly affected by the streamer propagation path and “stability” field. Furthermore, the influence of the material properties on the streamer propagation path was also discussed in depth. Full article

(This article belongs to the Special Issue Polymer Composites for Electrical and Electronic Engineering Application)

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10 pages, 4842 KiB

Open AccessArticle

The Dynamic Behaviour of Multi-Phase Flow on a Polymeric Surface with Various Hydrophobicity and Electric Field Strength

by Qi Li, Rui Liu, Li Li, Xiaofan Song, Yifan Wang and Xingliang Jiang

Polymers 2022, 14(4), 750; https://0-doi-org.brum.beds.ac.uk/10.3390/polym14040750 - 15 Feb 2022

Cited by 1 | Viewed by 1275

Abstract

The dynamic behaviour of rain droplets on the insulator surface is a key measure to its reliability and performance. This is due to the fact that the presence and motion of rain droplets cause intensive discharge activities, such as corona and low current arcing, which accelerate the ageing process and flashovers. This article aims to investigate and characterize the movement of a rain droplet placed on an inclined insulator surface subject to an intensive electric field. The rain droplets’ movement on hydrophobic surfaces in the absence of an electric field is investigated. A high speed camera is used to capture the footage and finite element method (FEM) is used to simulate the multi-physics phenomenon on two polymeric surfaces, namely, silicon rubber (SiR) and PTFE (polytetrafluoroethylene). A ‘creepage’ motion was observed. The inception of motion and the movement speed are analysed in correlation with various surface conditions. Models are established to estimate the moisture and potential discharge characteristics on the inclined polymeric surfaces. They are further utilized to analyse the actual insulators subject to wet conditions. Full article

(This article belongs to the Special Issue Polymer Composites for Electrical and Electronic Engineering Application)

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16 pages, 5263 KiB

Open AccessArticle

Investigation of the Compatibility and Damping Performance of Graphene Oxide Grafted Antioxidant/Nitrile-Butadiene Rubber Composite: Insights from Experiment and Molecular Simulation

by Meng Song, Xiulin Yue, Chaokang Chang, Fengyi Cao, Guomin Yu and Xiujuan Wang

Polymers 2022, 14(4), 736; https://0-doi-org.brum.beds.ac.uk/10.3390/polym14040736 - 14 Feb 2022

Cited by 15 | Viewed by 2044

Abstract

Rubber damping materials are widely used in electronics, electrical and other fields because of their unique viscoelasticity. How to prepare high-damping materials and prevent small molecule migration has attracted much attention. Antioxidant 4010NA was successfully grafted onto graphene oxide (GO) to prepare an anti-migration antioxidant (GO-4010NA). A combined molecular dynamics (MD) simulation and experimental study is presented to investigate the effects of small molecules 4010NA, GO, and GO-4010NA on the compatibility and damping properties of nitrile-butadiene rubber (NBR) composites. Differential scanning calorimetry (DSC) results showed that both 4010NA and GO-4010NA had good compatibility with the NBR matrix, and the T_g of GO-4010NA/NBR composite was improved. Dynamic mechanical analysis (DMA) data showed that the addition of GO-4010NA increased the damping performance of NBR than that of the addition of 4010NA. Molecular dynamics (MD) simulation results show GO-4010NA/NBR composites have the smallest free volume fraction (FFV) and the largest binding energy. GO-4010NA has a strong interaction with NBR due to the forming of hydrogen bonds (H-bonds). Grafting 4010NA onto GO not only inhibits the migration of 4010NA but also improves the damping property of NBR matrixes. This study provides new insights into GO grafted small molecules and the design of high-damping composites. Full article

(This article belongs to the Special Issue Polymer Composites for Electrical and Electronic Engineering Application)

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9 pages, 1268 KiB

Open AccessArticle

Improved Dielectric Breakdown Strength of Polyimide by Incorporating Polydopamine-Coated Graphitic Carbon Nitride

by Yinjie Dong, Zhaoyang Wang, Shouchao Huo, Jun Lin and Shaojian He

Polymers 2022, 14(3), 385; https://0-doi-org.brum.beds.ac.uk/10.3390/polym14030385 - 19 Jan 2022

Cited by 18 | Viewed by 1863

Abstract

Breakdown strength is an important parameter for polymer dielectric, and introducing inorganic filler into the polymer matrix is an efficient method to improve the breakdown strength. In this work, graphitic carbon nitride nanosheets (CNNS) were ultrasonically exfoliated and coated with polydopamine to obtain modified nanosheets (DCNNS), and then polyimide (PI) composite films with various CNNS and DCNNS were prepared and compared. Owing to the abundant hydroxyl groups of polydopamine, good filler-polymer compatibility and uniform filler dispersion were achieved for PI/DCNNS composites. Both breakdown strength and dielectric constant were improved with the addition of either CNNS or DCNNS. However, at the same filler content, the PI/DCNNS composites exhibited higher breakdown strength and dielectric constant than the PI/CNNS. The PI composite with 0.5 wt% DCNNS showed the highest breakdown strength of ~300 kV/mm, increased by 67.6% as compared to the pure PI, while the PI/CNNS composite with the same filler content only increased by 14.5%. Full article

(This article belongs to the Special Issue Polymer Composites for Electrical and Electronic Engineering Application)

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12 pages, 3125 KiB

Open AccessArticle

Molecular Dynamics Simulation of Cracking Process of Bisphenol F Epoxy Resin under High-Energy Particle Impact

by Yunqi Xing, Yuanyuan Chen, Jiakai Chi, Jingquan Zheng, Wenbo Zhu and Xiaoxue Wang

Polymers 2021, 13(24), 4339; https://0-doi-org.brum.beds.ac.uk/10.3390/polym13244339 - 11 Dec 2021

Cited by 3 | Viewed by 2163

Abstract

The current lead insulation of high-temperature superconductivity equipment is under the combined action of large temperature gradient field and strong electric field. Compared with a uniform temperature field, its electric field distortion is more serious, and it is easy to induce surface discharge to generate high-energy particles, destroy the insulation surface structure and accelerate insulation degradation. In this paper, the degradation reaction process of bisphenol F epoxy resin under the impact of high-energy particles, such as O₃⁻, HO^–, H₃O⁺ and NO⁺, is calculated based on ReaxFF simulation. According to the different types of high-energy particles under different voltage polarities, the micro-degradation mechanism, pyrolysis degree and pyrolysis products of epoxy resin are analyzed. The results show that in addition to the chemical reaction of high-energy particles with epoxy resin, their kinetic energy will also destroy the molecular structure of the material, causing the cross-linked epoxy resin to pyrolyze, and the impact of positive particles has a more obvious impact on the pyrolysis of epoxy resin. Full article

(This article belongs to the Special Issue Polymer Composites for Electrical and Electronic Engineering Application)

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15 pages, 4520 KiB

Open AccessArticle

Terahertz-Based Method for Accurate Characterization of Early Water Absorption Properties of Epoxy Resins and Rapid Detection of Water Absorption

by Hongchuan Dong, Yunfan Liu, Yanming Cao, Juzhen Wu, Sida Zhang, Xinlong Zhang and Li Cheng

Polymers 2021, 13(23), 4250; https://0-doi-org.brum.beds.ac.uk/10.3390/polym13234250 - 03 Dec 2021

Cited by 3 | Viewed by 1755

Abstract

Moisture is detrimental to the performance of epoxy resin material for electrical equipment in long-term operation and insulation. Therefore, moisture absorption is one of the critical indicators for insulation of the material. However, some relevant test methods, e.g., the direct weighing method, are time-consuming, and it usually takes months to complete a test. For this, it is necessary to have some modification to save the test time. Firstly, the study analyzes the present prediction method (according to ISO 62:2008). Under the same accuracy, the time required is reduced from 104 days to 71 days. Subsequently, the Langmuir curve-fitting method for water absorption of epoxy resin is analyzed, and the initial values of diffusion coefficient, bonding coefficient, and de-bonding coefficient are determined based on the results of molecular simulation, relevant experiment, and literature review. With the optimized prediction model, it takes only 1.5 days (reduced by 98% as compared with the standard prediction method) to determine the moisture absorbability. Then, the factors influencing the prediction accuracy are discussed. The results have shown that the fluctuation of balance at the initial stage will affect the test precision significantly. Accordingly, this study proposes a quantitative characterization method for initial trace moisture based on the terahertz method, by which the trace moisture in epoxy resin is represented precisely through the established terahertz time-domain spectroscopy system. When this method is used to predict the moisture absorbability, the experimental time may be further shortened by 33% to 1 day. For the whole water absorption cycle curve, the error is less than 5%. Full article

(This article belongs to the Special Issue Polymer Composites for Electrical and Electronic Engineering Application)

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16 pages, 3473 KiB

Open AccessArticle

Deep Insight into the Influences of the Intrinsic Properties of Dielectric Elastomer on the Energy-Harvesting Performance of the Dielectric Elastomer Generator

by Yingjie Jiang, Yujia Li, Haibo Yang, Nanying Ning, Ming Tian and Liqun Zhang

Polymers 2021, 13(23), 4202; https://0-doi-org.brum.beds.ac.uk/10.3390/polym13234202 - 30 Nov 2021

Cited by 6 | Viewed by 1566

Abstract

The dielectric elastomer (DE) generator (DEG), which can convert mechanical energy to electrical energy, has attracted considerable attention in the last decade. Currently, the energy-harvesting performances of the DEG still require improvement. One major reason is that the mechanical and electrical properties of DE materials are not well coordinated. To provide guidance for producing high-performance DE materials for the DEG, the relationship between the intrinsic properties of DE materials and the energy-harvesting performances of the DEG must be revealed. In this study, a simplified but validated electromechanical model based on an actual circuit is developed to study the relationship between the intrinsic properties of DE materials and the energy-harvesting performance. Experimental verification of the model is performed, and the results indicate the validity of the proposed model, which can well predict the energy-harvesting performances. The influences of six intrinsic properties of DE materials on energy-harvesting performances is systematically studied. The results indicate that a high breakdown field strength, low conductivity and high elasticity of DE materials are the prerequisites for obtaining high energy density and conversion efficiency. DE materials with high elongation at break, high permittivity and moderate modulus can further improve the energy density and conversion efficiency of the DEG. The ratio of permittivity and the modulus of the DE should be tailored to be moderate to optimize conversion efficiency (η) of the DEG because using DE with high permittivity but extremely low modulus may lead to a reduction in η due to the occurrence of premature “loss of tension”. Full article

(This article belongs to the Special Issue Polymer Composites for Electrical and Electronic Engineering Application)

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13 pages, 4444 KiB

Open AccessArticle

Influence of Silicone Rubber Coating on the Characteristics of Surface Streamer Discharge

by Xiaobo Meng, Liming Wang, Hongwei Mei and Chuyan Zhang

Polymers 2021, 13(21), 3784; https://0-doi-org.brum.beds.ac.uk/10.3390/polym13213784 - 31 Oct 2021

Cited by 5 | Viewed by 1535

Abstract

A pollution flashover along an insulation surface—a catastrophic accident in electrical power system—threatens the safe and reliable operation of a power grid. Silicone rubber coatings are applied to the surfaces of other insulation materials in order to improve the pollution flashover voltage of the insulation structure. It is generally believed that the hydrophobicity of the silicone rubber coating is key to blocking the physical process of pollution flashover, which prevents the formation of continuously wet pollution areas. However, it is unclear whether silicone rubber coating can suppress the generation of pre-discharges such as corona discharge and streamer discharge. In this research, the influence of silicone rubber coating on the characteristics of surface streamer discharge was researched in-depth. The streamer ‘stability’ propagation fields of the polymer are lower than that of the polymer with silicone rubber coating. The velocities of the streamer propagation along the polymer are higher than those along the polymer with silicone rubber coating. This indicates that the surface properties of the polymer with the silicone rubber coating are less favorable for streamer propagation than those of the polymer. Full article

(This article belongs to the Special Issue Polymer Composites for Electrical and Electronic Engineering Application)

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13 pages, 5430 KiB

Open AccessArticle

Frequency and Temperature-Dependent Space Charge Characteristics of a Solid Polymer under Unipolar Electrical Stresses of Different Waveforms

by Hanwen Ren, Qingmin Li, Yasuhiro Tanaka, Hiroaki Miyake, Haoyu Gao and Zhongdong Wang

Polymers 2021, 13(19), 3401; https://0-doi-org.brum.beds.ac.uk/10.3390/polym13193401 - 03 Oct 2021

Cited by 2 | Viewed by 1514

Abstract

In this paper, we studied the space charge phenomena of a solid polymer under thermal and electrical stresses with different frequencies and waveforms. By analyzing the parameter selection method of a protection capacitor and resistor, the newly built pulsed electro-acoustic (PEA) system can be used for special electrical stresses under 500 Hz, based on which the charge phenomena are studied in detail under positive and negative DC and half-wave sine and rectangular wave voltages. Experimental results show that the charge accumulated in the polyimide polymer under DC conditions mainly comes from the grounded electrode side, and the amount of charge accumulated with electric field distortion becomes larger in a high-temperature environment. At room temperature, positive charges tend to accumulate in low-frequency conditions under positive rectangular wave voltages, while they easily appear under high-frequency situations of negative ones. In contrast, the maximum electric field distortion and charge accumulation under both half-wave sine voltages occur at 10 Hz. When the measurement temperature increases, the accumulated positive charge decreases, with a more negative charge appearing under rectangular wave voltages, while a more positive charge accumulates at different frequencies of half-wave sine voltages. Therefore, our study of the charge characteristics under different voltage and temperature conditions can provide a reference for applications in the corresponding environments. Full article

(This article belongs to the Special Issue Polymer Composites for Electrical and Electronic Engineering Application)

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21 pages, 43448 KiB

Open AccessArticle

Research on the Compound Optimization Method of the Electrical and Thermal Properties of SiC/EP Composite Insulating Material

by Xupeng Song, Xiaofeng Xue, Wen Qi, Jin Zhang, Yang Zhou, Wei Yang, Yiran Zhang, Boyang Shen, Jun Lin and Xingming Bian

Polymers 2021, 13(19), 3369; https://0-doi-org.brum.beds.ac.uk/10.3390/polym13193369 - 30 Sep 2021

Cited by 2 | Viewed by 1791

Abstract

In this paper, in order to improve the electrical and thermal properties of SiC/EP composites, the methods of compounding different crystalline SiC and micro-nano SiC particles are used to optimize them. Under different compound ratios, the thermal conductivity and breakdown voltage parameters of the composite material were investigated. It was found that for the SiC/EP composite materials of different crystal types of SiC, when the ratio of α and β silicon carbide is 1:1, the electrical performance of the composite material is the best, and the breakdown strength can be increased by more than 10% compared with the composite material filled with single crystal particles. For micro-nano compound SiC/EP composites, different total filling amounts of SiC correspond to different optimal ratios of micro/nano particles. At the optimal ratio, the introduction of nanoparticles can increase the breakdown strength of the composite material by more than 10%. Compared with the compound of different crystalline SiC, the advantage is that the introduction of a small amount of nanoparticles can play a strong role in enhancing the break-down field strength. For the filled composite materials, the thermal conductivity mainly depends on whether an effective heat conduction channel can be constructed. Through experiments and finite element simulation calculations, it is found that the filler shape and particle size have a greater impact on the thermal conductivity of the composite material, when the filler shape is rounder, the composite material can more effectively construct the heat conduction channel. Full article

(This article belongs to the Special Issue Polymer Composites for Electrical and Electronic Engineering Application)

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12 pages, 2513 KiB

Open AccessArticle

Bioinspired Dielectric Film with Superior Mechanical Properties and Ultrahigh Electric Breakdown Strength Made from Aramid Nanofibers and Alumina Nanoplates

by Qiu-Wanyu Qing, Cheng-Mei Wei, Qi-Han Li, Rui Liu, Zong-Xi Zhang and Jun-Wen Ren

Polymers 2021, 13(18), 3093; https://0-doi-org.brum.beds.ac.uk/10.3390/polym13183093 - 14 Sep 2021

Cited by 7 | Viewed by 2128

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. Full article

(This article belongs to the Special Issue Polymer Composites for Electrical and Electronic Engineering Application)

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