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Functional Polymers for Energy, Biomedical and Electrical Applications
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Functional Polymers for Energy, Biomedical and Electrical Applications

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: 20 November 2024 | Viewed by 1759

Special Issue Editors

Dr. Shakila Parveen Asrafali

E-Mail Website
Guest Editor
School of Fiber System and Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea
Interests: polymer chemistry; polymers for energy applications
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Jaewoong Lee

E-Mail Website
Guest Editor
Department of Fiber System Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea
Interests: natural and synthetic fibers; polymeric materials; textile engineering

Special Issue Information

Dear Colleagues,

Over the years, polymers have been widely studied and applied to numerous fields due to their versatile and adjustable chemical and physical properties. The use of synthetic polymers has especially seen significant growth and application in many sophisticated fields, such as biomedicine, sensors, electronics, energy storage, and convention devices.

This Special Issue aims to highlight recent progress in the manufacturing, characterization, and modification of polymeric materials with applications in the energy, biomedical, and electrical fields. It is our pleasure to invite you to submit your manuscript.

Potential topics include, but are not limited to, the following:

  • Polymer-based materials for energy storage (i.e., electrochemical capacitors and batteries) and green energy systems;
  • Bio-based and bio-sourced polymers;
  • Polymeric materials derived from natural/synthetic fibers and textiles;
  • Polymeric materials for health and biomedical applications;
  • Self-assembled polymers;
  • Polymers for electronic devices and packaging materials.

Dr. Shakila Parveen Asrafali
Prof. Dr. Jaewoong Lee
Guest Editors

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. Materials 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 2600 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

  • polymers in energy storage
  • bio-polymers
  • polymer based carbon
  • green energy
  • bio-medical applications
  • supercapacitor applications
  • polymers in electronic devices
  • CO2 adsorption
  • self-assembled polymers

Published Papers (3 papers)

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Research

13 pages, 9097 KiB  
Article
Enhanced Wettability and Adhesive Property of PTFE through Surface Modification with Fluorinated Compounds
by Shakila Parveen Asrafali, Thirukumaran Periyasamy, Seong-Cheol Kim and Jae-Woong Lee
Materials 2024, 17(13), 3051; https://doi.org/10.3390/ma17133051 - 21 Jun 2024
Viewed by 187
Abstract
Polytetrafluoroethylene (PTFE) is prized for its unique properties in electrical applications, but its natural hydrophobicity poses challenges as it repels water and can cause electrical short circuits, shortening equipment lifespan. In this work, the mentioned issue has been tackled by using two different [...] Read more.
Polytetrafluoroethylene (PTFE) is prized for its unique properties in electrical applications, but its natural hydrophobicity poses challenges as it repels water and can cause electrical short circuits, shortening equipment lifespan. In this work, the mentioned issue has been tackled by using two different fluorinated compounds, such as perfluorooctanoic acid (PFOA)/perfluorooctanol (PFOL), along with plasma processing to enhance the surface hydrophilicity (water attraction) of PTFE. This method, demonstrated on Teflon membrane, quickly transformed their surfaces from hydrophobic to hydrophilic in less than 30 s. The treated films achieved a water contact angle saturation of around 80°, indicating a significant increase in water affinity. High-resolution C 1s X-ray photoelectron spectroscopy (XPS) confirmed the formation of new bonds, such as -COOH and -OH, on the surface, responsible for enhanced hydrophilicity. Extended plasma treatment led to further structural changes, evidenced by increased intensity in infrared (IR) and Raman spectra, particularly sensitive to vibrations associated with the C-F bond. Moreover, Attenuated Total Reflectance Fourier-Transform Infrared Spectroscopy (ATR-FTIR) showed the formation of surface-linked functional groups, which contributed to the improved water attraction. These findings decisively show that treatment with fluoro-compound along with plasma processing can be considered as a highly effective and rapid method for converting PTFE surfaces from hydrophobic to hydrophilic, facilitating its broader use in various electrical applications. Full article
(This article belongs to the Special Issue Functional Polymers for Energy, Biomedical and Electrical Applications)
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20 pages, 9545 KiB  
Article
Mechanical Behaviour of Photopolymer Cell-Size Graded Triply Periodic Minimal Surface Structures at Different Deformation Rates
by Yunus Emre Yılmaz, Nejc Novak, Oraib Al-Ketan, Hacer Irem Erten, Ulas Yaman, Anja Mauko, Matej Borovinsek, Miran Ulbin, Matej Vesenjak and Zoran Ren
Materials 2024, 17(10), 2318; https://doi.org/10.3390/ma17102318 - 14 May 2024
Cited by 1 | Viewed by 574
Abstract
This study investigates how varying cell size affects the mechanical behaviour of photopolymer Triply Periodic Minimal Surfaces (TPMS) under different deformation rates. Diamond, Gyroid, and Primitive TPMS structures with spatially graded cell sizes were tested. Quasi-static experiments measured boundary forces, representing material behaviour, [...] Read more.
This study investigates how varying cell size affects the mechanical behaviour of photopolymer Triply Periodic Minimal Surfaces (TPMS) under different deformation rates. Diamond, Gyroid, and Primitive TPMS structures with spatially graded cell sizes were tested. Quasi-static experiments measured boundary forces, representing material behaviour, inertia, and deformation mechanisms. Separate studies explored the base material’s behaviour and its response to strain rate, revealing a strength increase with rising strain rate. Ten compression tests identified a critical strain rate of 0.7 s−1 for “Grey Pro” material, indicating a shift in failure susceptibility. X-ray tomography, camera recording, and image correlation techniques observed cell connectivity and non-uniform deformation in TPMS structures. Regions exceeding the critical rate fractured earlier. In Primitive structures, stiffness differences caused collapse after densification of smaller cells at lower rates. The study found increasing collapse initiation stress, plateau stress, densification strain, and specific energy absorption with higher deformation rates below the critical rate for all TPMS structures. However, cell-size graded Primitive structures showed a significant reduction in plateau and specific energy absorption at a 500 mm/min rate. Full article
(This article belongs to the Special Issue Functional Polymers for Energy, Biomedical and Electrical Applications)
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18 pages, 3844 KiB  
Article
Compatibilization of Polyamide 6/Cyclic Olefinic Copolymer Blends for the Development of Multifunctional Thermoplastic Composites with Self-Healing Capability
by Davide Perin, Andrea Dorigato and Alessandro Pegoretti
Materials 2024, 17(8), 1880; https://doi.org/10.3390/ma17081880 - 18 Apr 2024
Viewed by 830
Abstract
This study investigated the self-healing properties of PA6/COC blends, in particular, the impact of three compatibilizers on the rheological, microstructural, and thermomechanical properties. Dynamic rheological analysis revealed that ethylene glycidyl methacrylate (E-GMA) played a crucial role in reducing interfacial tension and promoting PA6 [...] Read more.
This study investigated the self-healing properties of PA6/COC blends, in particular, the impact of three compatibilizers on the rheological, microstructural, and thermomechanical properties. Dynamic rheological analysis revealed that ethylene glycidyl methacrylate (E-GMA) played a crucial role in reducing interfacial tension and promoting PA6 chain entanglement with COC domains. Mechanical tests showed that poly(ethylene)-graft-maleic anhydride (PE-g-MAH) and polyolefin elastomer-graft-maleic anhydride (POE-g-MAH) compatibilizers enhanced elongation at break, while E-GMA had a milder effect. A thermal healing process at 140 °C for 1 h was carried out on specimens broken in fracture toughness tests, performed under quasi-static and impact conditions, and healing efficiency (HE) was evaluated as the ratio of critical stress intensity factors of healed and virgin samples. All the compatibilizers increased HE, especially E-GMA, achieving 28.5% and 68% in quasi-static and impact conditions, respectively. SEM images of specimens tested in quasi-static conditions showed that all the compatibilizers induced PA6 plasticization and crack corrugation, thus hindering COC flow in the crack zone. Conversely, under impact conditions, E-GMA led to the formation of brittle fractures with planar surfaces, promoting COC flow and thus higher HE values. This study demonstrated that compatibilizers, loading mode, and fracture surface morphologies strongly influenced self-healing performance. Full article
(This article belongs to the Special Issue Functional Polymers for Energy, Biomedical and Electrical Applications)
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