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Polymers
Special Issues
Dielectric Properties of Polymers
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Dielectric Properties of Polymers

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

Deadline for manuscript submissions: 31 October 2024 | Viewed by 1201

Special Issue Editor

Dr. Dinara Sobola

E-Mail Website
Guest Editor
Department of Physics, Faculty of Electrical Engineering and Communication, Brno University of Technology, Technicka 10, 616 00 Brno, Czech Republic
Interests: material; thin films; surface; microscopy; polymers
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

At present, polymer materials are widely used in various industries due to their excellent properties. Nowadays, electronic equipment is subjected to more requirements due to its superior features such as high complexity. Traditional dielectric materials cannot meet the new requirements. Polymer materials have become the preferred materials in electrical engineering due to their excellent dielectric properties. Therefore, it is necessary to study the dielectric properties of polymer materials. This mainly depends on the dielectric properties of the interface region. This Special Issue aims to collect articles and review papers on the study of polymer dielectric properties. Scholars are welcome to actively contribute.

Dr. Dinara Sobola
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
  • dielectric properties
  • composites
  • thin films

Published Papers (2 papers)

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Research

14 pages, 3878 KiB  
Article
Crown Ether Copolymerized Polyimide Film: Enhanced Mechanical, Thermal Properties and Low Dielectric Constant under High Frequency
by Heming Li, Xinming Wang, Ziyang Ding, Weiguo Gao, Yan Liu, Ke Ma, Zhizhi Hu and Yongqi Wang
Polymers 2024, 16(9), 1188; https://doi.org/10.3390/polym16091188 - 24 Apr 2024
Viewed by 359
Abstract
Polymer materials with a low dielectric constant and low dielectric loss have the potential to be applied to high-frequency signal transmissions, such as mobile phone antennas and millimeter wave radars. Two types of diamines, 4,4′-diamino-p-tetraphenyl (DPT) and crown ether diamine (CED), were prepared [...] Read more.
Polymer materials with a low dielectric constant and low dielectric loss have the potential to be applied to high-frequency signal transmissions, such as mobile phone antennas and millimeter wave radars. Two types of diamines, 4,4′-diamino-p-tetraphenyl (DPT) and crown ether diamine (CED), were prepared for ternary copolymerization with BPDA in this study. Cross-links with molecular chains were formed, increasing molecular chain distance by utilizing rings of CED. The MPI films exhibit a good thermal performance with the increase in CED addition, with Tg > 380 °C and CTE from −4 × 10−6 K−1 to 5 × 10−6 K−1. The Young’s modulus can reach 8.6 GPa, and the tensile strength is above 200 MPa when 5% and 7% CED are introduced. These MPI films exhibit good mechanical performances. The dielectric constant of PI−10% film can go as low as 3.17. Meanwhile, the relationship between dielectric properties and molecular structure has been demonstrated by Molecular Simulation (MS). PI molecules are separated by low dielectric groups, resulting in a decrease in the dielectric constant. Full article
(This article belongs to the Special Issue Dielectric Properties of Polymers)
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18 pages, 5416 KiB  
Article
Electrical Characterization of Epoxy Nanocomposite under High DC Voltage
by Ammar Alsoud, Samer I. Daradkeh, Saleh R. Al-Bashaish, Adel A. Shaheen, Ahmad M. D. (Assa’d) Jaber, Adel M. Abuamr, Marwan S. Mousa and Vladimír Holcman
Polymers 2024, 16(7), 963; https://doi.org/10.3390/polym16070963 - 2 Apr 2024
Cited by 1 | Viewed by 627
Abstract
This work studies the direct current breakdown characteristics of unfilled epoxy and epoxy nonconductive nanocomposites (SiO2,MgO and Al2O3). It also examines the variation of electrical properties in epoxy nanocomposites. The [...] Read more.
This work studies the direct current breakdown characteristics of unfilled epoxy and epoxy nonconductive nanocomposites (SiO2,MgO and Al2O3). It also examines the variation of electrical properties in epoxy nanocomposites. The novel aspect of this study is that the samples of Epoxy nanocomposite were exposed to high voltages of up to six kilo volts for three hours using field electron microscopy under high vacuum conditions (10−5 mbar). The current emitted from these samples was measured at three different intervals of time. In addition, the influence of high voltage on the permittivity, loss factor (tan(δ)), and conductivity of the epoxy nanocomposite was studied. This evaluation was conducted before and after applying the voltage at room temperature, The frequency range extends from 10−2–10−7 Hz using the Novo Control Alpha-A analyzer. Current–voltage characterization was performed through field electron microscopy. The samples were characterized by scanning electron microscopy–energy dispersive X-ray spectroscopy and Fourier Transform Infrared Spectroscopy. The unfilled epoxy exhibited structural degradation, resulting in the formation of holes when exposed to high voltages of up to six kilo volts, leading to a reduction in electrical properties. Nevertheless, the addition of nanoparticles shows a significant increase in the operational lifetime of the epoxy nanocomposite. The degree of increase in the lifetime of epoxy composite varied depending on several factors such as the type of NPs introduced and their respective sizes. The epoxy/Al2O3 nanocomposite comparing with epoxy/MgO and epoxy/SiO2 nanocomposite showed elevated resistance to direct current breakdown strength and maintaining its dielectric. Full article
(This article belongs to the Special Issue Dielectric Properties of Polymers)
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