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Study on the Mechanism of Molecular Weight Reduction of Polyethylene Based on Fe-Montmorillonite and Its Potential Application
The reactions occurring in the oxidative degradation phase during the photo-oxidative degradation of polyethylene (PE) are the factors leading to molecular weight reduction. However, the mechanism of molecular weight reduction before oxidative degradation has not been clarified. The present study ai...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10057148/ https://www.ncbi.nlm.nih.gov/pubmed/36987210 http://dx.doi.org/10.3390/polym15061429 |
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author | Wang, Zhiming Chen, Huimin Zhang, Yunpeng Wang, Qingzhao |
author_facet | Wang, Zhiming Chen, Huimin Zhang, Yunpeng Wang, Qingzhao |
author_sort | Wang, Zhiming |
collection | PubMed |
description | The reactions occurring in the oxidative degradation phase during the photo-oxidative degradation of polyethylene (PE) are the factors leading to molecular weight reduction. However, the mechanism of molecular weight reduction before oxidative degradation has not been clarified. The present study aims to investigate the photodegradation of PE/Fe-montmorillonite (Fe-MMT) films, especially molecular weight change. The results show the rate of photo-oxidative degradation of each PE/Fe-MMT film is much faster than that of the pure linear low-density polyethylene (LLDPE) film. A decrease in the molecular weight of polyethylene was also found in the photodegradation phase. Based on this, it was found that the transfer and coupling of primary alkyl radicals originating from photoinitiation lead to a decrease in the molecular weight of polyethylene, and the kinetic results validate this new mechanism well. This new mechanism is an improvement on the existing mechanism of molecular weight reduction during the photo-oxidative degradation of PE. In addition, Fe-MMT can greatly accelerate the reduction of PE molecular weight into small oxygen-containing molecules as well as induce cracks on the surface of polyethylene films, all of which can accelerate the biodegradation process of polyethylene microplastics. The excellent photodegradation properties of PE/Fe-MMT films will be useful in the design of more environmentally friendly degradable polymers. |
format | Online Article Text |
id | pubmed-10057148 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-100571482023-03-30 Study on the Mechanism of Molecular Weight Reduction of Polyethylene Based on Fe-Montmorillonite and Its Potential Application Wang, Zhiming Chen, Huimin Zhang, Yunpeng Wang, Qingzhao Polymers (Basel) Article The reactions occurring in the oxidative degradation phase during the photo-oxidative degradation of polyethylene (PE) are the factors leading to molecular weight reduction. However, the mechanism of molecular weight reduction before oxidative degradation has not been clarified. The present study aims to investigate the photodegradation of PE/Fe-montmorillonite (Fe-MMT) films, especially molecular weight change. The results show the rate of photo-oxidative degradation of each PE/Fe-MMT film is much faster than that of the pure linear low-density polyethylene (LLDPE) film. A decrease in the molecular weight of polyethylene was also found in the photodegradation phase. Based on this, it was found that the transfer and coupling of primary alkyl radicals originating from photoinitiation lead to a decrease in the molecular weight of polyethylene, and the kinetic results validate this new mechanism well. This new mechanism is an improvement on the existing mechanism of molecular weight reduction during the photo-oxidative degradation of PE. In addition, Fe-MMT can greatly accelerate the reduction of PE molecular weight into small oxygen-containing molecules as well as induce cracks on the surface of polyethylene films, all of which can accelerate the biodegradation process of polyethylene microplastics. The excellent photodegradation properties of PE/Fe-MMT films will be useful in the design of more environmentally friendly degradable polymers. MDPI 2023-03-14 /pmc/articles/PMC10057148/ /pubmed/36987210 http://dx.doi.org/10.3390/polym15061429 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Wang, Zhiming Chen, Huimin Zhang, Yunpeng Wang, Qingzhao Study on the Mechanism of Molecular Weight Reduction of Polyethylene Based on Fe-Montmorillonite and Its Potential Application |
title | Study on the Mechanism of Molecular Weight Reduction of Polyethylene Based on Fe-Montmorillonite and Its Potential Application |
title_full | Study on the Mechanism of Molecular Weight Reduction of Polyethylene Based on Fe-Montmorillonite and Its Potential Application |
title_fullStr | Study on the Mechanism of Molecular Weight Reduction of Polyethylene Based on Fe-Montmorillonite and Its Potential Application |
title_full_unstemmed | Study on the Mechanism of Molecular Weight Reduction of Polyethylene Based on Fe-Montmorillonite and Its Potential Application |
title_short | Study on the Mechanism of Molecular Weight Reduction of Polyethylene Based on Fe-Montmorillonite and Its Potential Application |
title_sort | study on the mechanism of molecular weight reduction of polyethylene based on fe-montmorillonite and its potential application |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10057148/ https://www.ncbi.nlm.nih.gov/pubmed/36987210 http://dx.doi.org/10.3390/polym15061429 |
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