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Polymers
Special Issues
Aging of Polymer Material
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Aging of Polymer Material

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

Deadline for manuscript submissions: closed (25 September 2023) | Viewed by 4175

Special Issue Editor

Prof. Dr. Rui Yang

E-Mail Website
Guest Editor
Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
Interests: aging mechanism; stability evaluation and lifetime prediction of polymer materials; heat storage material based on phase change material (pcm); structure–property relationship of polymer materials

Special Issue Information

Dear Colleagues,

Polymeric materials have been widely used in nearly all civil and industrial applications, including packaging, coatings and waterproof materials in buildings, front panels, seats and tires in cars, gears and seals in industrial equipment, agriculture films, etc. In the past decade, new functional materials have been emerging, especially in new energy resources, environmental protection and sustainable development. The aging of polymeric materials is, therefore, increasingly concerned either with long-life constructional and functional or degradable and recyclable products. Consequently, a material can be used safely or designed and developed with a balanced high-performance and controllable lifetime.

This Special Issue focuses on the aging research of polymeric materials, including, but not limited to, their aging behavior and mechanisms, aging status monitoring, stability evaluation methods and instruments, and the lifetime prediction, calculation and simulation addressing challenges posed by current and future materials.

Prof. Dr. Rui Yang
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

  • aging behavior and mechanism
  • aging status monitoring
  • stability evaluation method and instrument
  • lifetime prediction
  • calculation and simulation
  • structure–property relationship
  • anti-aging
  • pro-aging

Published Papers (3 papers)

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Research

17 pages, 6923 KiB  
Article
Asphaltenes from Heavy Crude Oil as Ultraviolet Stabilizers against Polypropylene Aging
by Viktoria Y. Melekhina, Anna V. Vlasova and Sergey O. Ilyin
Polymers 2023, 15(21), 4313; https://doi.org/10.3390/polym15214313 - 3 Nov 2023
Viewed by 865
Abstract
The destruction of polymers under the influence of ultraviolet (UV) radiation is the cause of their aging and deterioration of strength properties. Asphaltenes are low-value waste products after the refining and deasphalting of heavy crude oil, which absorb UV radiation well. Asphaltenes require [...] Read more.
The destruction of polymers under the influence of ultraviolet (UV) radiation is the cause of their aging and deterioration of strength properties. Asphaltenes are low-value waste products after the refining and deasphalting of heavy crude oil, which absorb UV radiation well. Asphaltenes require rational utilization, which suggests their use as UV stabilizing agents for polymers. In this work, asphaltenes were used to prevent UV aging of polypropylene (PP) by adding them in a mass fraction from 5% to 30% within an asphaltene/PP composite material. Rheometry, calorimetry, X-ray diffraction analysis, and tensile strength of PP films containing asphaltenes were performed before and after their intense UV irradiation for accelerated aging. Asphaltenes slightly reduce the viscosity, crystallinity, and mechanical strength of the initial PP due to their plasticizing effect. However, this deterioration in properties is more than compensated when studying UV-aged samples. Intense UV aging causes multiple catastrophic drops in the viscosity and strength of pure PP with the preservation of crystallinity due to the break of polymer chains and a decrease in molecular weight by approximately eight times. Asphaltenes suppress the destruction of PP, which is expressed in a significantly smaller decline in its viscosity and strength due to UV aging. The most optimal content of asphaltenes is 20%, which suppresses UV destruction by six times and best preserves the strength properties of PP. Full article
(This article belongs to the Special Issue Aging of Polymer Material)
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10 pages, 1501 KiB  
Article
Wear Analysis of Tibial Inserts Made of Highly Cross-Linked Polyethylene Supplemented with Dodecyl Gallate before and after Accelerated Aging
by Jian Su, Jianjun Wang, Shitong Yan, Min Zhang, Ningze Zhang, Yichao Luan and Cheng-Kung Cheng
Polymers 2022, 14(23), 5281; https://doi.org/10.3390/polym14235281 - 3 Dec 2022
Cited by 1 | Viewed by 1115
Abstract
The wear of the tibial insert is one of the primary factors leading to the failure of total knee arthroplasty. As materials age, their wear performance often degrades. Supplementing highly cross-linked polyethylene (HXLPE) with dodecyl gallate (DG) can improve the oxidation stability of [...] Read more.
The wear of the tibial insert is one of the primary factors leading to the failure of total knee arthroplasty. As materials age, their wear performance often degrades. Supplementing highly cross-linked polyethylene (HXLPE) with dodecyl gallate (DG) can improve the oxidation stability of tibial inserts for use in total knee arthroplasty (TKA). This study aimed to evaluate the wear resistance of HXLPE supplemented with DG (HXLPE-DG) tibial inserts before and after accelerated aging. HXLPE-DG tibial inserts were subjected to wear testing of up to 5 million loading cycles according to ISO 14243, and the resulting wear particles were analyzed according to ISO 17853. The wear rate, number, size, and shape of the wear particles were analyzed. The average wear rate of the unaged samples was 4.39 ± 0.75 mg/million cycles and was 3.22 ± 1.49 mg/million cycles for the aged samples. The unaged tibial inserts generated about 2.80 × 107 particles/mL following the wear test, but this was considerably lower for the aged samples at about 1.35 × 107 particles/mL. The average equivalent circle diameter (ECD) of the wear particles from the unaged samples was 0.13 μm (max: 0.80 μm; min: 0.04 μm), and it was 0.14 μm (max: 0.66 μm; min: 0.06 μm) from the aged samples. Moreover, 22.1% of the wear particles from the unaged samples had an aspect ratio (AR) of >4 (slender shape), while this was 15.4% for the aged samples. HXLPE-DG improves the wear performance of the material over time. HXLPE-DG is a novel material that has been demonstrated to have antiaging properties and high wear resistance, making it a promising candidate for use in TKA. Nevertheless, the results are preliminary and will be clarified in further studies. Full article
(This article belongs to the Special Issue Aging of Polymer Material)
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15 pages, 3079 KiB  
Article
Effects of m-Aramid/p-Aramid Blend Ratio on Tensile Strength due to UV Degradation for Firefighter Clothing Fabrics and Development of Predictive Equation for Tensile Strength
by Kaoru Wakatsuki, Minami Matsubara, Norimichi Watanabe, Limin Bao and Hideaki Morikawa
Polymers 2022, 14(16), 3241; https://doi.org/10.3390/polym14163241 - 9 Aug 2022
Cited by 6 | Viewed by 1659
Abstract
This study focused on the m-Aramid/p-Aramid blend ratio of the fabrics, clarified the quantitative relationship between UV exposure and strength retention, and developed a mathematical model to calculate tensile strength from an arbitrary amount of UV exposure energy. The results of tensile strength [...] Read more.
This study focused on the m-Aramid/p-Aramid blend ratio of the fabrics, clarified the quantitative relationship between UV exposure and strength retention, and developed a mathematical model to calculate tensile strength from an arbitrary amount of UV exposure energy. The results of tensile strength tests before and after UV exposure showed that the decrease in tensile strength due to UV degradation depended on the combination of p-Aramid and m-Aramid blend percentages. Tensile strength for all blend ratios decreased exponentially with UV exposure energy and was within the range of results for fabrics with p-Aramid 100% and m-Aramid 100%. The retention fraction of tensile strength, which represents the tensile strength after UV exposure relative to the initial tensile strength, decreased exponentially with increasing the fraction of UV exposure energy for all fabrics used in this study. Fitting the retention fraction of tensile strength to the fraction of UV exposure energy, two groups of fabrics were classified based on m-Aramid blends of 40% or more and 60% or less. This model can predict the tensile strength of firefighter clothing fabrics that retain high mechanical strength when exposed to UV light and design the strength of firefighter clothing with consideration of degradation over time. Full article
(This article belongs to the Special Issue Aging of Polymer Material)
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