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Polymers
Special Issues
Characterizations for the Polymer Aging
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Characterizations for the Polymer Aging

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

Deadline for manuscript submissions: 15 August 2024 | Viewed by 1745

Special Issue Editor

Dr. Rui Tian

E-Mail Website
Guest Editor
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, China
Interests: polymeric composites; three-dimensional visualization; fluorescence; chemiluminescence; room-temperature phosphorescence

Special Issue Information

Dear Colleagues,

Polymers and their products have been widely applied in various fields ranging from medical, agriculture and construction to military affairs. For the polymers in service, aging occurred inevitably under external conditions such as heat, light and humidity. Polymer aging has caused wide concern as an inducement of severe accidents and long-term environmental pollution. Therefore, effective and accurate characterization methods were needed to detect the aging signal and monitor the aging evolution, to ensure the polymers are durable in life and degradable on demand.

This Special Issue, “Characterizations for the Polymer Ageing”, focuses on the latest developments in the characterization strategies for aged polymers. Different characterization techniques on the different aging stages for the polymers are welcomed in this Special Issue, involving the early-initiation, radical-accelerated, chain-broken and late-aging stages. Papers addressing research articles or reviews could be discussed in this field.

Dr. Rui Tian
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

  • characterization technique
  • polymer aging
  • polymer degradation
  • spectral analysis
  • imaging analysis
  • structure–performance correlation
  • lifetime prediction
  • dynamic studies

Published Papers (2 papers)

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Research

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16 pages, 19664 KiB  
Article
Effect of Complex Well Conditions on the Swelling and Tribological Properties of High-Acrylonitrile Stator Rubber in Screw Pumps
by Xinfu Liu, Xiangzhi Shi, Zhongxian Hao, Songbo Wei, Yi Sun, Xinglong Niu, Chunhua Liu, Ming Li and Zunzhao Li
Polymers 2024, 16(14), 2036; https://doi.org/10.3390/polym16142036 - 17 Jul 2024
Viewed by 213
Abstract
The effects of complex well conditions in shale oil wells on the swelling and tribological properties of high-acrylonitrile stator rubber used in screw pumps were investigated in this study. Tests were conducted considering the combined effects of immersion medium, temperature, and duration. The [...] Read more.
The effects of complex well conditions in shale oil wells on the swelling and tribological properties of high-acrylonitrile stator rubber used in screw pumps were investigated in this study. Tests were conducted considering the combined effects of immersion medium, temperature, and duration. The key parameters measured included mass change rate, volume change rate, hardness, elongation at break, tensile strength, surface micro-morphology of the rubber after thermal expansion and swelling, friction coefficient, and wear quantity. The results indicated that in the actual well fluids, the mass change rate of high-acrylonitrile rubber ranged from −1.08% to 1.29%, with a maximum volume change rate of 2.78%. In diesel oil, the greatest mass change rate of the rubber was 4.68%, and the volume change rate did not exceed ±1%, indicating superior swelling resistance. In both actual well fluids and diesel oil, the maximum decreases in hardness were 8.7% and 9.5%, respectively. Tensile strength and elongation at break decreased with increasing immersion temperature, with elongation at break in 80 °C diesel oil decreasing by over 50%, indicating a significant decline in the tensile properties of the rubber. The average friction coefficient of rubber specimens immersed in actual well fluids at three temperatures, as well as in diesel oil at 25 and 50 °C, decreased compared with the high-acrylonitrile rubber without thermal expansion and swelling. However, the average friction coefficient of rubber specimens immersed in diesel oil at 80 °C increased. The wear quantity of the rubber increased following immersion in both media. Additionally, the friction coefficient and wear quantity of the rubber increased with increasing immersion temperatures. The results of the study can offer valuable insights into assessing the durability of properties in high-acrylonitrile stator rubber under complex well conditions. Full article
(This article belongs to the Special Issue Characterizations for the Polymer Aging)
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Review

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17 pages, 3304 KiB  
Review
Aging of Plasma-Activated Polyethylene and Hydrophobic Recovery of Polyethylene Polymers
by Miran Mozetič
Polymers 2023, 15(24), 4668; https://doi.org/10.3390/polym15244668 - 11 Dec 2023
Cited by 2 | Viewed by 1035
Abstract
Available literature on the aging of plasma-activated polyethylene due to hydrophobic recovery has been reviewed and critically assessed. A common method for the evaluation of hydrophobic recovery is the determination of the static water contact angle, while the surface free energy does not [...] Read more.
Available literature on the aging of plasma-activated polyethylene due to hydrophobic recovery has been reviewed and critically assessed. A common method for the evaluation of hydrophobic recovery is the determination of the static water contact angle, while the surface free energy does not reveal significant correlations. Surface-sensitive methods for the characterization of chemical composition and structure have limited applicability in studying the aging phenomenon. Aging is driven by thermodynamics, so it is observed even upon storage in a vacuum, and hydrophobic recovery increases with increasing temperature. Storage of plasma-activated polyethylene in the air at ambient conditions follows almost logarithmic behavior during the period studied by most authors; i.e., up to one month. The influence of the storage medium is somehow controversial because some authors reported aging suppression by storing in polar liquids, but others reported the loss of hydrophilicity even after a brief immersion into distilled water. Methods for suppressing aging by hydrophobic recovery include plasma treatment at elevated temperature followed by brief treatment at room temperature and application of energetic ions and photons in the vacuum ultraviolet range. Storing at low temperatures is a trivial alternative, but not very practical. The aging of plasma-activated polyethylene suppresses the adhesion of many coatings, but the correlation between the surface free energy and the adhesion force has yet to be addressed adequately. Full article
(This article belongs to the Special Issue Characterizations for the Polymer Aging)
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