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Polymers
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Advances in the Processing and Application of Polymers and Their...
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Advances in the Processing and Application of Polymers and Their Composites III

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

Deadline for manuscript submissions: 30 November 2024 | Viewed by 3884

Special Issue Editors

Dr. Hui Zhao

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Guest Editor
School of Light Industry and Food Engineering, Guangxi University, Nanning, China
Interests: polyurethane; cellulose; composites
Special Issues, Collections and Topics in MDPI journals
Dr. Wei Wu

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Guest Editor
Engineering Center for Superlubricity, Jihua Laboratory, Foshan 528200, China
Interests: polymer composite; dielectric properties; thermal stability; mechanical properties
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Polymeric materials and their composites have been widely utilized in previously unimagined areas due to their light weight, high flexibility, and excellent processing ability. Along with the fast-increasing consumption of polymeric materials in recent years, the demand for advanced polymer processing technology is ever-increasing. Advanced polymer processing, including 3D printing, electrospinning, extrusion, injection molding, compression molding, casting, injection molding, etc., can convert polymeric materials into various useful products. Obviously, the processing conditions, properties, and structures of polymeric materials and their composites have a close relationship with each other. The aim of this Special Issue is to present a collection of research or review papers to depict the recent progress in the processing and application of polymeric materials and their composites. We welcome contributions dealing with related research fields; we hope that this stimulating subject will inspire you to submit a manuscript to this Special Issue.

Dr. Hui Zhao
Dr. Wei Wu
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

  • polymer composites
  • biodegradable polymer
  • polymer processing
  • antibacterial
  • thermal stability
  • mechanical properties

Published Papers (4 papers)

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Research

16 pages, 14563 KiB  
Article
Tribological Behavior of Sulfonated Polyether Ether Ketone with Three Different Chemical Structures under Water Lubrication
by Xiaozhi Chen, Tao Hu, Wei Wu, Xiaohong Yi, Fenghua Li and Chenhui Zhang
Polymers 2024, 16(7), 998; https://0-doi-org.brum.beds.ac.uk/10.3390/polym16070998 - 5 Apr 2024
Viewed by 441
Abstract
With the development of the shipbuilding industry, it is necessary to improve tribological properties of polyether ether ketone (PEEK) as a water-lubricated bearing material. In this study, the sulfonated PEEK (SPEEK) with three distinct chemical structures was synthesized through direct sulfonated polymerization, and [...] Read more.
With the development of the shipbuilding industry, it is necessary to improve tribological properties of polyether ether ketone (PEEK) as a water-lubricated bearing material. In this study, the sulfonated PEEK (SPEEK) with three distinct chemical structures was synthesized through direct sulfonated polymerization, and high fault tolerance and a controllable sulfonation degree ensured the batch stability. The tribological and mechanical properties of SPEEK with varying side groups (methyl and tert-butyl) and rigid segments (biphenyl) were compared after sintering in a vacuum furnace. Compared to the as-made PEEK, as the highly electronegative sulfonic acid group enhanced the hydration lubrication, the friction coefficient and wear rate of SPEEK were significantly reduced by 30% and 50% at least without affecting the mechanical properties. And lower steric hindrance and entanglement between molecular chains were proposed to be partially responsible for the lowest friction behavior of SPEEK with methyl side groups, making it a promising and competitive option for water-lubricated bearings. Full article
(This article belongs to the Special Issue Advances in the Processing and Application of Polymers and Their Composites III)
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21 pages, 7203 KiB  
Article
Investigation of Physical Properties of Polymer Composites Filled with Sheep Wool
by Martin Vasina, Premysl Straznicky, Pavel Hrbacek, Sona Rusnakova, Ondrej Bosak and Marian Kubliha
Polymers 2024, 16(5), 690; https://0-doi-org.brum.beds.ac.uk/10.3390/polym16050690 - 2 Mar 2024
Viewed by 1141
Abstract
Sheep farmers are currently facing an oversupply of wool and a lack of willing buyers. Due to low prices, sheep wool is often either dumped, burned, or sent to landfills, which are unsustainable and environmentally unfriendly practices. One potential solution is the utilization [...] Read more.
Sheep farmers are currently facing an oversupply of wool and a lack of willing buyers. Due to low prices, sheep wool is often either dumped, burned, or sent to landfills, which are unsustainable and environmentally unfriendly practices. One potential solution is the utilization of sheep wool fibers in polymer composites. This paper focuses on the study of mechanical vibration damping properties, sound absorption, light transmission, electrical conductivity of epoxy (EP), polyurethane (PU), and polyester (PES) resins, each filled with three different concentrations of sheep wool (i.e., 0%, 3%, and 5% by weight). It can be concluded that the sheep wool content in the polymer composites significantly influenced their physical properties. The impact of light transmission through the tested sheep wool fiber-filled polymer composites on the quality of daylight in a reference room was also mathematically simulated using Wdls 5.0 software. Full article
(This article belongs to the Special Issue Advances in the Processing and Application of Polymers and Their Composites III)
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17 pages, 37425 KiB  
Article
Melting Behaviors of Bio-Based Poly(propylene 2,5-furan dicarboxylate)-b-poly(ethylene glycol) Co Polymers Related to Their Crystal Morphology
by Ouyang Shi, Peng Li, Chao Yang, Haitian Jiang, Liyue Qin, Wentao Liu, Xiaolin Li and Zhenming Chen
Polymers 2024, 16(1), 97; https://0-doi-org.brum.beds.ac.uk/10.3390/polym16010097 - 28 Dec 2023
Viewed by 730
Abstract
In this experiment, a series of poly(propylene 2,5-furan dicarboxylate)-b-poly(ethylene glycol) (PPFEG) copolymers with different ratios were synthesized using melt polycondensation of dimethylfuran-2,5-dicarboxylate (DMFD), 1,3-propanediol (PDO) and poly(ethylene glycol) (PEG). The effect of PEG content on the crystallization behavior of the poly(propylene 2,5-furan dicarboxylate) [...] Read more.
In this experiment, a series of poly(propylene 2,5-furan dicarboxylate)-b-poly(ethylene glycol) (PPFEG) copolymers with different ratios were synthesized using melt polycondensation of dimethylfuran-2,5-dicarboxylate (DMFD), 1,3-propanediol (PDO) and poly(ethylene glycol) (PEG). The effect of PEG content on the crystallization behavior of the poly(propylene 2,5-furan dicarboxylate) (PPF) copolymers was investigated. For PPF, the nucleation density of the β-crystals was higher than that of α-crystals. As Tc increases, the β crystals are suppressed more, but at Tc = 140 °C, the bulk of PPF has already been converted to α crystals, which crystallize faster at higher nucleation densities, resulting in a difference in polymer properties. For this case, we chose to add a soft segment material, PEG, which led to an early multi–melt crystallization behavior of the PPF. The addition of PEG led to a decrease in the crystallization temperature of PPF, as well as a decrease in the cold crystallization peak of PPF. From the crystalline morphology, it can be seen that the addition of PEG caused the transformation of the PPF crystalline form to occur earlier. From the crystalline morphology of PPF at 155 °C, it can be observed that the ring-banded spherical crystals of the PPF appear slowly with increasing time. With the addition of PEG, spherical crystals of the ring band appeared earlier, and even appeared first, and then disappeared slowly. Full article
(This article belongs to the Special Issue Advances in the Processing and Application of Polymers and Their Composites III)
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19 pages, 8761 KiB  
Article
Simplified Characterization of Anisotropic Yield Criteria for an Injection-Molded Polymer Material
by Sharlin Shahid, Eskil Andreasson, Viktor Petersson, Widaad Gukhool, Yuchi Kang and Sharon Kao-Walter
Polymers 2023, 15(23), 4520; https://0-doi-org.brum.beds.ac.uk/10.3390/polym15234520 - 24 Nov 2023
Cited by 1 | Viewed by 1242
Abstract
Injection-molded polyethylene plates exhibit highly anisotropic mechanical behavior due to, e.g., the uneven orientation of the polymer chains during the molding process and the differential cooling, especially in the thickness direction. Elastoplastic finite element modeling of these plates in particular is used with [...] Read more.
Injection-molded polyethylene plates exhibit highly anisotropic mechanical behavior due to, e.g., the uneven orientation of the polymer chains during the molding process and the differential cooling, especially in the thickness direction. Elastoplastic finite element modeling of these plates in particular is used with isotropic yield criteria like von Mises, trading off accuracy in favor of simpler constitutive characterization and faster solution. This article studies three different anisotropic yield criteria, namely, Hill 1948, Barlat Yld91, and Barlat Yld2004-18P, for the finite element modeling of low-density polyethylene (LDPE) at large uniaxial tensile deformation and compares the accuracy and computation time with von Mises. A simplified calibration technique is investigated to identify the constitutive parameters of the studied Barlat group yield criteria. The calibration process is simplified in the sense that only uniaxial tensile tests with digital image correlation measurements are used for the calibration of all the yield criteria studied in this article, although a standard calibration procedure for the Barlat group yield criteria requires additional material testing using more demanding test setups. It is concluded that both Barlat Yld91 and Barlat Yld2004-18P yield criteria can be calibrated with only a few tensile tests and still capture anisotropy in deformation–stress–strain at different levels of accuracy. Full article
(This article belongs to the Special Issue Advances in the Processing and Application of Polymers and Their Composites III)
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