Topical Collection "Polymer/Biopolymer Stabilization and Degradation"

Editors

Dr. Dan Rosu
E-Mail Website
Collection Editor
Centre of Advanced Research in Bionanoconjugates and Biopolymers, “Petru Poni” Institute of Macromolecular Chemistry, 41A Gr. Ghica-Voda Alley, 700487 Iasi, Romania
Interests: synthesis and characterization of phenolic, epoxy and vinyl-ester resins; extractions and characterization of natural products; theoretical aspects regarding polymers adhesive and cohesive capacity; correlation of molecular structure characteristics with adhesive properties of macromolecular compounds; aspects regarding synthetic adhesives properties and characterization, methods of control and their testing; complex capitalization of the vegetable biomass, respectively of polymer waste products through pyrolysis; synthesis and characterization of interpenetrating polymer networks; studies of thermal degradation and polymers compatibility (study of decomposition processes, establishing the mechanisms and kinetics of thermal degradation); studies of polymers photochemical behavior. Recent researches regarding polymers aging under light, especially UV radiation from the solar spectrum, as well as polymers photostabilization
Dr. Cristian–Dragos Varganici
E-Mail Website
Collection Editor
"Petru Poni" Institute of Macromolecular Chemistry Centre of Advanced Research in Bionanoconjugates and Biopolymers Gr.Ghica Voda Alley 41A, 700487 Iasi, Romania
Interests: thermal degradation and polymer compatibility (decomposition processes and mechanisms and kinetics of thermal degradation); structure–property relationships in polymers; polymer photochemical behavior; aging of polymers under environmental factors, especially UV radiation from the solar spectrum; polymer photostabilization

Topical Collection Information

Dear Colleagues,

Due to their structures, the polymeric materials used in various application areas are characterized by limited stability during exposure to an environment. Therefore, their specific properties decline during long-term exploitation. Conditions such as processing, storage, and service conditions also add structural imperfections that contribute to the lowering of the material’s lifetime. Accurate results from weathering tests must be obtained by the manufacturers, since the lifetime and extent of an application depend on molecular modifications. Polymer degradation occurs through bond cleavage, radical diffusion, oxidation, and crosslinking. The main factors that contribute synergistically to polymer degradation are heat, light (especially in the UV region), humidity, microorganisms, pollutants, and mechanical charge. Environmental factors must be correlated with the material’s structure. Laboratory-accelerated and field tests take place similarly but not identically in polymers. The main difference between the two procedures resides in the concentrations of radicals and their migration in the material bulk. The diffusion of free radicals is influenced by such factors as bond strength, morphology, molecular weight distribution, crosslinking degree, crystallinity, inorganic filler(s), stabilizers, mechanical charge, processing conditions, and sample history. The planning of laboratory and field testing of polymers may be designed in combination with the various factors taken into account. This Topic Collection is concerned with the thermal, photochemical, and microbiological behavior of polymer-based materials. We hope to share new concepts related to the behavior of polymeric materials under environmental factors, both under laboratory and outdoor exposure conditions. In this way, we seek to bring new insights into the different degradation mechanisms of polymers. Both original research papers and review articles are welcome.

Dr. Dan Rosu
Dr. Cristian–Dragos Varganici
Collection 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 papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the collection 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 2200 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

  • polymers
  • multicomponent polymer-based materials
  • thermal behavior
  • thermal stability
  • evolved gases analysis
  • thermal degradation kinetics
  • thermal degradation mechanisms
  • thermal transitions in polymers
  • thermal analysis devices
  • photochemical behavior of polymers
  • photocrosslinking
  • photostabilization
  • photocatalysis
  • UV irradiation devices
  • photodegradation mechanisms
  • life-time prediction from thermal and photochemical data
  • biodegradation of polymers

Related Special Issues

Published Papers (2 papers)

2021

Jump to: 2020

Article
Effect of Thermal Aging on the Physico-Chemical and Optical Properties of Poly(ester urethane) Elastomers Designed for Passive Damping (Pads) of the Railway
Polymers 2021, 13(2), 192; https://doi.org/10.3390/polym13020192 - 07 Jan 2021
Viewed by 535
Abstract
The aim of this study consists of monitoring the effect of thermal aging on the physico-chemical and optical properties of poly(ester urethane) elastomers designed as damping materials for railways. The materials were obtained by polyaddition in two stages in melt, resulting in regular [...] Read more.
The aim of this study consists of monitoring the effect of thermal aging on the physico-chemical and optical properties of poly(ester urethane) elastomers designed as damping materials for railways. The materials were obtained by polyaddition in two stages in melt, resulting in regular structures. The structural modifications during the thermal aging of the samples were monitored using FTIR, color changes, TGA in non-isothermal and isothermal conditions, DSC and physico-mechanical measurements. The structural regularity of the rigid and flexible segments maintained the good mechanical properties of the structures up to 200 h of thermal aging at the elevated temperatures of 40 °C, 70 °C, 100 °C and 130 °C. It was observed that at 40 °C and low exposure times, changes occur mainly to the carbonyl groups of the soft segments. At higher temperatures and longer exposure times urethane groups were affected. Extended thermal aging led to significant changes in thermo-mechanical and optical properties. Full article
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Graphical abstract

2020

Jump to: 2021

Article
Study on the Synthesis and Thermal Stability of Silicone Resin Containing Trifluorovinyl Ether Groups
Polymers 2020, 12(10), 2284; https://doi.org/10.3390/polym12102284 - 05 Oct 2020
Viewed by 758
Abstract
Silicone resin is a high-temperature resistant material with excellent performance. The improvement of its thermal stability has always been the pursuit of researchers. In this paper, a sequence of silicone resins containing trifluorovinyl ether groups were prepared by the co-hydrolysis-polycondensation of methyl alkoxysilane [...] Read more.
Silicone resin is a high-temperature resistant material with excellent performance. The improvement of its thermal stability has always been the pursuit of researchers. In this paper, a sequence of silicone resins containing trifluorovinyl ether groups were prepared by the co-hydrolysis-polycondensation of methyl alkoxysilane monomers and {4-[trifluorovinyl(oxygen)]phenyl}methyldiethoxysilane. The structures of the silicone resins were characterized by FT-IR and 1H NMR. The curing process of them was studied by DSC and FT-IR spectra, and results showed that the curing of the resins included the condensation of the Si-OH groups and the [2 + 2] cyclodimerization reaction of the TFVE groups, which converted to perfluorocyclobutane structure after curing. The thermal stability and thermal degradation behavior of them was studied by TGA and FT-IR spectra. Compared with the pure methyl silicone resin, silicone resins containing TFVE groups showed better thermal stability under both N2 and air atmosphere. Their hydrophobic properties were characterized by contact angle test. Results showed that PFCB structure also improved the hydrophobicity of the silicone resin. Full article
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Graphical abstract

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