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Polymers
Special Issues
Degradation and Recycling of Polymer Materials
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Degradation and Recycling of Polymer Materials

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

Deadline for manuscript submissions: 10 May 2024 | Viewed by 1004

Special Issue Editor

Prof. Dr. Hisayuki Nakatani

E-Mail Website
Guest Editor
Polymeri Materials Laboratory, Chemistry and Materials Program, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
Interests: recycling; biodegradation; degradation and stabilization of plastics; green chemistry

Special Issue Information

Dear Colleagues,

In order to suppress microplastic (MP) generation, it is necessary to elucidate the degradation mechanism of plastics, which is deeply involved in the MP generation mechanism, and to develop a new recycling process. In addition, it is necessary to focus on additives such as antioxidants and UV absorbers, which have been suggested to be toxic, and to understand their behavior during the degradation of plastics.

In this Special Issue, we welcome submissions of articles elucidating the plastic degradation mechanisms and developing new plastic recycling methods. In addition, we also encourage contributions studying the behavior not only of plastics, but also of the additives contained in them during degradation and recycling. 

Prof. Dr. Hisayuki Nakatani
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

  • microplastics
  • polymer degradation
  • polymer recycling
  • additives
  • antioxidants
  • UV absorbers

Published Papers (1 paper)

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Research

12 pages, 2830 KiB  
Article
Differences in the Residual Behavior of a Bumetrizole-Type Ultraviolet Light Absorber during the Degradation of Various Polymers
by Hisayuki Nakatani, Taishi Uchiyama, Suguru Motokucho, Anh Thi Ngoc Dao, Hee-Jin Kim, Mitsuharu Yagi and Yusaku Kyozuka
Polymers 2024, 16(2), 293; https://doi.org/10.3390/polym16020293 - 21 Jan 2024
Viewed by 800
Abstract
The alteration of an ultraviolet light absorber (UVA: UV-326) in polymers (PP, HDPE, LDPE, PLA, and PS) over time during degradation was studied using an enhanced degradation method (EDM) involving sulfate ion radicals in seawater. The EDM was employed to homogeneously degrade the [...] Read more.
The alteration of an ultraviolet light absorber (UVA: UV-326) in polymers (PP, HDPE, LDPE, PLA, and PS) over time during degradation was studied using an enhanced degradation method (EDM) involving sulfate ion radicals in seawater. The EDM was employed to homogeneously degrade the entire polymer samples containing the UVA. The PP and PS samples containing 5-phr (phr: per hundred resin) UVA films underwent rapid whitening, characterized by the formation of numerous grooves or crushed particles. Notably, the UVA loss rate in PS, with the higher glass transition temperature (Tg), was considerably slower. The behavior of crystalline polymers, with the exception of PS, was analogous in terms of the change in UVA loss rate over the course of degradation. The significant increase in the initial loss rate observed during EDM degradation was due to microplasticization. A similar increase in microplasticization rate occurred with PS; however, the intermolecular interaction between UVA and PS did not result in as pronounced an increase in loss rate as observed in other polymers. Importantly, the chemical structure of UVA remained unaltered during EDM degradation. These findings revealed that the primary cause of UVA loss was leaching from the polymer matrix. Full article
(This article belongs to the Special Issue Degradation and Recycling of Polymer Materials)
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