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Degradation and Stability of Polymer-Based Systems: 2nd Edition

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Circular and Green Sustainable Polymer Science".

Deadline for manuscript submissions: 31 August 2025 | Viewed by 731

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Guest Editor
Department of Engineering, Univerisity of Palermo, 90128 Palermo, Italy
Interests: polymeric materials; nanocomposites; green composites; polymer blends; polymer engineering
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Special Issue Information

Dear Colleagues,

Degradation mechanism management plays a key role in polymeric devices/objects properties and performance control. This challenge, in fact, is very interesting as it allows to modulate the properties during use and its lifetime.

There are many degradation processes that may induce the polymeric chains scission: thermal, mechanical, photo-oxidative, biological, and chemical degradation. Such processes can take place during processing/forming (by heat or mechanical stress action) or during use and end of life.

To optimize degradation mechanisms and kinetics control, it is necessary to carefully investigate the degradative responses of polymeric-based materials when exposed to external stresses (sunlight, bacterial attack, atmospheric agents, ozone, etc.), or when subjected to processing (stresses mechanical and thermal). Furthermore, it is interesting to evaluate how the addition of micro- or nano-fillers and/or stabilizers influence degradation processes.

Therefore, papers are sought that deal with the stabilization and/or degradation of polymeric systems, either providing new insights on the processing–structure–aging property relationships. Latest research dealing with degradative reactions in special application fields and/or proposing novel characterization protocols will also be of great interest.

Prof. Dr. Roberto Scaffaro
Dr. Emmanuel Fortunato Gulino
Guest Editors

Manuscript Submission Information

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Keywords

  • polymeric materials
  • degradation and stability
  • green composites
  • nanocomposites
  • polymer composites
  • biodegradation
  • photodegradation
  • chemical degradation
  • thermal degradation
  • mechanical degradation

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Published Papers (1 paper)

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Research

19 pages, 5170 KiB  
Article
Green Sulfation of Arabinogalactan in the Melt of a Sulfamic Acid–Urea Mixture
by Vladimir A. Levdansky, Alexander V. Levdansky, Yuriy N. Malyar, Timur Yu. Ivanenko, Olga Yu. Fetisova, Aleksandr S. Kazachenko and Boris N. Kuznetsov
Polymers 2025, 17(5), 642; https://doi.org/10.3390/polym17050642 - 27 Feb 2025
Viewed by 417
Abstract
Sulfation of arabinogalactan (AG) from larch wood (Larix sibirica Ledeb.) in the melt of a sulfamic acid–urea mixture has been first examined. The impact of the AG sulfation temperature on the AG sulfate yield and the sulfur content has been established. [...] Read more.
Sulfation of arabinogalactan (AG) from larch wood (Larix sibirica Ledeb.) in the melt of a sulfamic acid–urea mixture has been first examined. The impact of the AG sulfation temperature on the AG sulfate yield and the sulfur content has been established. The high sulfur content (11.3–11.6%) in sulfated AG has been obtained in the temperature range of 115–120 °C for a sulfation time of 0.5 h. The process effectively prevents molecular degradation under these conditions. The incorporation of sulfate groups into the arabinogalactan structure has been confirmed by the appearance of absorption bands in the FTIR spectrum that are typical of sulfate group vibrations. The 13C NMR spectroscopy study has proven that the AG sulfation in the melt of a sulfamic acid–urea mixture leads to the substitution of some free hydroxyl groups for C6, C4, and C2 carbon atoms of the AG β-D-galactopyranose units. The advantage of the proposed AG sulfation method is that the reaction occurs without solvent, and the reaction time is only 0.5 h. The kinetics of the thermal decomposition of the initial AG and sulfated AG samples have been studied. It has been found that the sulfated AG samples have a lower thermal resistance than the initial AG. The kinetic analysis has revealed a decrease in the activation energy of the thermal degradation of the sulfated samples as compared to the initial AG. Full article
(This article belongs to the Special Issue Degradation and Stability of Polymer-Based Systems: 2nd Edition)
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