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Polymers
Special Issues
Multifunctional Polymers and Their Composites: Design, Processing and Properties
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Multifunctional Polymers and Their Composites: Design, Processing and Properties

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

Deadline for manuscript submissions: 30 April 2024 | Viewed by 2276

Special Issue Editors

Dr. Lu Zhang

E-Mail Website
Guest Editor
College of Material Science and Engineering, Shenyang Aerospace University, Shenyang, China
Interests: nanocomposites; functionalization; sensor response mechanism; structural health monitoring; manufacturing monitoring
Prof. Dr. Shaowei Lu

E-Mail Website
Guest Editor
College of Material Science and Engineering, Shenyang Aerospace University, Shenyang, China
Interests: nanocomposites; functionalization; thermal conductivity and conductivity; electromagnetic shielding; sensor design and controllable standby
Dr. Xiaoqiang Wang

E-Mail Website
Guest Editor
College of Aerospace Engineering, Shenyang Aerospace University, Shenyang, China
Interests: nanocomposites; sensor design and controllable standby; sensor response mechanism; structural health monitoring

Special Issue Information

Dear Colleagues,

Polymer nanocomposites combine the unique physical and chemical properties of nanofillers with the flexibility of polymers, playing an important role in many functional applications, including stealth, electromagnetic shielding, and thermal and conductive materials. Advanced polymer nanocomposites with superior performance have attracted more and more attention in the fields of aerospace, vehicles and ships, and civil engineering, especially in terms of the intelligent manufacturing and health monitoring of composite structures. This Special Issue, entitled "Multifunctional Polymers and Their Composites: Design, Processing and Properties", not only discusses the field of multifunctional nanocomposites, which has become a hot topic recently, but also introduces the intelligent manufacturing and health monitoring of composite materials. The scope of the Special Issue includes the design and preparation of nanocomposites, as well as health monitoring during the manufacturing and service of nanocomposites. We are eager to receive original contributions that focus on the following related topics:

  Surface modification and dispersion of nanomaterials;
  Interface design and control of multiscale composites;
  Forming principle of functional nanocomposites;
  Functional verification of composite materials;
  Sensor design and controllable standby;
  Sensor response mechanism;
  Manufacturing monitoring and process optimization of composite components;
  Structural health monitoring and fault early warning technology for composite components.

Dr. Lu Zhang
Prof. Dr. Shaowei Lu
Dr. Xiaoqiang Wang
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. 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

  • nanocomposites
  • functionalization
  • thermal conductivity and conductivity
  • electromagnetic shielding
  • sensor design and controllable standby
  • sensor response mechanism
  • structural health monitoring
  • manufacturing monitoring

Published Papers (3 papers)

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Research

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20 pages, 5072 KiB  
Article
Characterization of Radiation Shielding Capabilities of High Concentration PLA-W Composite for 3D Printing of Radiation Therapy Collimators
by José Velásquez, Melani Fuentealba and Mauricio Santibáñez
Polymers 2024, 16(6), 769; https://doi.org/10.3390/polym16060769 - 11 Mar 2024
Viewed by 666
Abstract
This work evaluates the radiation shielding capabilities of the PLA-W composite for MV energy photons emitted by a linear accelerator and the feasibility of manufacturing a clinically-used collimator grid in spatially fractionated radiotherapy (SFRT) using the material extrusion (MEX) 3D printing technique. The [...] Read more.
This work evaluates the radiation shielding capabilities of the PLA-W composite for MV energy photons emitted by a linear accelerator and the feasibility of manufacturing a clinically-used collimator grid in spatially fractionated radiotherapy (SFRT) using the material extrusion (MEX) 3D printing technique. The PLA-W filament used has a W concentration of 93% w/w and a green density of 7.51 g/cm3, characteristics that make it suitable for this purpose. Relevant parameters such as the density and homogeneity distribution of W in the manufactured samples determine the mass attenuation coefficient, directly affecting the radiation shielding capacities, so different printing parameters were evaluated, such as layer height, deposition speed, nozzle temperature, and infill, to improve the protection performance of the samples. Additionally, physical and mechanical tests were conducted to ensure structural stability and spatial variability over time, which are critical to ensure precise spatial modulation of radiation. Finally, a complete collimator grid measuring 9.3 × 9.3 × 7.1 cm3 (consisting of 39 conical collimators with a diameter of 0.92 cm and center-to-center spacing of 1.42 cm) was manufactured and experimentally evaluated on a clinical linear accelerator to measure the radiation shielding and dosimetric parameters such as mass attenuation coefficient, half-value layer (HVL), dosimetric collimator field size, and inter-collimator transmission using radiochromic films and 2D diode array detectors, obtaining values of 0.04692 cm2/g, 2.138 cm, 1.40 cm, and 15.6%, respectively, for the parameters in the study. This shows the viability of constructing a clinically-used collimator grid through 3D printing. Full article
(This article belongs to the Special Issue Multifunctional Polymers and Their Composites: Design, Processing and Properties)
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17 pages, 8089 KiB  
Article
Study on the Electrical Insulation Properties of Modified PTFE at High Temperatures
by Lijian Yuan, Xu Zheng, Wenbo Zhu, Bin Wang, Yuanyuan Chen and Yunqi Xing
Polymers 2024, 16(3), 316; https://doi.org/10.3390/polym16030316 - 24 Jan 2024
Viewed by 651
Abstract
During the operation of multi-electric aircraft, the polytetrafluoroethylene (PTFE) material used to insulate the aviation cable is subjected to a high electric field while working under the extreme conditions of high temperatures for a long time, which can easily cause a partial discharge [...] Read more.
During the operation of multi-electric aircraft, the polytetrafluoroethylene (PTFE) material used to insulate the aviation cable is subjected to a high electric field while working under the extreme conditions of high temperatures for a long time, which can easily cause a partial discharge and even flashover along the surface, which seriously threaten the safe operation of the aircraft. In this paper, the electrical insulation properties of PTFE were regulated via modification by the magnetron sputtering of TiO2 under high temperatures, and modified PTFE with different sputtering times was prepared. The direct current (DC) surface discharge, surface flashover, and electric aging characteristics of modified PTFE were studied under the condition of 20~200 °C, and the mechanisms by which modification by sputtering of TiO2 and high temperature influence the insulation properties were analyzed. The results show that the surface discharge intensity increases with the increase in temperature, the modification by sputtering of TiO2 can significantly inhibit the partial discharge of PTFE, and the flashover voltage first increases and then decreases with the increase in the modification time. The modification by magnetron sputtering can effectively increase the surface potential decay rate of the PTFE, increase the shallow trap energy density, effectively avoid charge accumulation, inhibit the partial discharge phenomenon, and improve the surface electrical insulation and anti-aging properties. Full article
(This article belongs to the Special Issue Multifunctional Polymers and Their Composites: Design, Processing and Properties)
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Review

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30 pages, 14513 KiB  
Review
Synthesis, Structure, Properties, and Applications of Fluorinated Polyurethane
by Donghan Li, Lu Yu, Zhan Lu, Hailan Kang, Long Li, Shufa Zhao, Ning Shi and Shibo You
Polymers 2024, 16(7), 959; https://doi.org/10.3390/polym16070959 - 01 Apr 2024
Viewed by 707
Abstract
Fluorinated polyurethane (FPU) is a new kind of polyurethane (PU) material with great applicational potential, which is attributed to its high bond energy C-F bonds. Its unique low surface energy, excellent thermal stability, and chemical stability have attracted considerable research attention. FPU with [...] Read more.
Fluorinated polyurethane (FPU) is a new kind of polyurethane (PU) material with great applicational potential, which is attributed to its high bond energy C-F bonds. Its unique low surface energy, excellent thermal stability, and chemical stability have attracted considerable research attention. FPU with targeted performance can be precisely synthesized through designing fluorochemicals as hard segments, soft segments, or additives and changes to the production process to satisfy the needs of coatings, clothing textiles, and the aerospace and biomedical industries for materials that are hydrophobic and that are resistant to weathering, heat, and flames and that have good biocompatibility. Here, the synthesis, structure, properties, and applications of FPU are comprehensively reviewed. The aims of this research are to shed light on the design scheme, synthesis method, structure, and properties of FPU synthesized from different kinds of fluorochemicals and their applications in different fields and the prospects for the future development of FPU. Full article
(This article belongs to the Special Issue Multifunctional Polymers and Their Composites: Design, Processing and Properties)
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