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Advances in Characterization, Measurement and Electrical Performance of Polymer and Composites Materials

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

Deadline for manuscript submissions: 31 May 2025 | Viewed by 3063

Special Issue Editor


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Guest Editor
State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
Interests: dielectric and insulating material; insulation reliability; renewable energy power equipment; space charge measurement and theory
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Special Issue Information

Dear Colleagues,

Polymer and composite materials have found extensive applications in the fields of electric power, electronics, and new energy vehicles, among others. The future development of polymers and composites is currently focused on their characterization, measurement, and electrical properties. In recent years, there has been a rapid increase in the demand for novel high-performance polymer-based materials, driven by the requirements of new energy power systems and electric vehicles.

It is essential to further summarize and discuss the polymer materials with high performance, particularly focusing on the fundamental research and advancements in the characterization and measurement of electrical properties. Despite numerous employed methods, such as SEM, TEM, and AFM for microstructure analysis, studies on electrical and optical performances remain highly relevant. Many research groups extensively investigate nanocomposites with interface morphology, material aging, degradation, and breakdown in great detail. The emergence of new operating conditions like high temperature and multi-frequency electric strength necessitates well-defined materials with newly developed methods and phenomena.

This Special Issue focuses on polymer and composite materials that have excellent electrical performance, as well as advanced methods for short- and long-term operations. The list of keywords provided below provides a general description of the topics covered, which can be helpful in preparing your submission. However, manuscripts related to this field are welcome even if they do not include these specific keywords.

Dr. Weiwang Wang
Guest Editor

Manuscript Submission Information

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 composites
  • electrical performance
  • characterization
  • measurement
  • aging
  • degradation
  • morphology
  • dielectric polymers
  • insulation
  • energy storage

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Published Papers (2 papers)

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Research

12 pages, 2520 KiB  
Article
Molecular Dynamics Study on Thermal Conductivity Properties and Dielectric Behaviors of Graphene-Based Epoxy Resin Nanocomposites
by Chong Zhang, Chaofeng Zhao, Huize Cui, Bo Wang, Chumeng Luo, Ruilu Guo, Shuo Chen, Wenwen Gu and Wenpeng Li
Polymers 2025, 17(1), 112; https://doi.org/10.3390/polym17010112 - 3 Jan 2025
Viewed by 952
Abstract
In order to increase the thermal conductivity of neat epoxy resin and broaden its practical application in high-voltage insulation systems, we have constructed four kinds of epoxy resin nanocomposite models (a neat epoxy resin (EP), a graphene-doped epoxy resin nanocomposite (EP/GR) and hydroxyl- [...] Read more.
In order to increase the thermal conductivity of neat epoxy resin and broaden its practical application in high-voltage insulation systems, we have constructed four kinds of epoxy resin nanocomposite models (a neat epoxy resin (EP), a graphene-doped epoxy resin nanocomposite (EP/GR) and hydroxyl- or carboxyl-functionalized graphene-doped epoxy resin nanocomposites (EP/GR-OH or EP/GR-COOH)) to systematically investigate their thermodynamic and electrical properties using molecular dynamics (MD) simulations. Compared with the EP model, carboxyl-functionalized graphene particles enhanced the thermal conductivity of the EP/GR-COOH model by 66.5% and increased its Tg by 26.6 K. Furthermore, the dielectric constant of the EP/GR-COOH model was significantly reduced. To investigate the intrinsic mechanism, the lowest fraction of free volume (13.22%) and the largest number of hydrogen bonds (102.2) in the EP/GR-COOH model were identified as playing essential roles for its excellent thermodynamic properties and favorable electrical performance. The present study provides a molecular-level understanding of the satisfactory thermodynamic and electrical properties of the EP/GR-COOH nanocomposite, which will aid in designing novel epoxy resin nanocomposite materials with high thermal conductivity. Full article
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16 pages, 4501 KiB  
Article
Influence of Thermal Aging on Space Charge Characteristics and Electrical Conduction Behavior of Cross-Linked Polyethylene Cable Insulation
by Jie Yang, Ruizhe Li, Leiyu Hu and Weiwang Wang
Polymers 2024, 16(11), 1600; https://doi.org/10.3390/polym16111600 - 5 Jun 2024
Cited by 6 | Viewed by 1387
Abstract
The aging of cable insulation presents a significant threat to the safe operation of cables, with space charge serving as a crucial factor influencing cable insulation degradation. However, the characteristics related to space charge and conduction current behavior during thermal aging remain unclear. [...] Read more.
The aging of cable insulation presents a significant threat to the safe operation of cables, with space charge serving as a crucial factor influencing cable insulation degradation. However, the characteristics related to space charge and conduction current behavior during thermal aging remain unclear. This study focused on the thermal aging of cross-linked polyethylene (XLPE) material and utilizes a combined pulse electro-acoustic (PEA) and conduction current testing system to analyze the space charge and conduction current characteristics in the sample under varying electric fields and temperatures. The average charge density, short-circuit residual electric field, electric field distortion rate, and conduction current were studied. The findings indicate that the space charge in the samples following thermal aging is predominantly governed by the injected charge. The amorphous region of XLPE decreases, while the cross-linking degree increases after aging, thereby facilitating charge carrier migration within the sample and reducing the generation of charge carriers through thermal pyrolysis. The minimum temperature required for charge injection is reduced by thermal aging. Furthermore, modifications in conduction current, residual electric field, and average charge density indicate that thermal aging has the potential to alter the microstructure and trap characteristics of XLPE. This study provides empirical evidence to elucidate the underlying mechanism of cable insulation aging. Full article
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