Peculiarity of the Mechanism of Early Stages of Photo-Oxidative Degradation of Linear Low-Density Polyethylene Films in the Presence of Ferric Stearate
Ferric stearate (FeSt<sub>3</sub>) is very efficient in accelerating polyethylene (PE) degradation, but there is a lack of exploration of its role in accelerating the early stages of polyethylene photo-oxidative degradation. This study aimed to investigate the effect of FeSt<sub>3&...
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MDPI AG
2023-09-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/15/18/3672 |
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| author | Zhiming Wang Zhongwei Wang Dayong Liu Qingzhao Wang |
| author_facet | Zhiming Wang Zhongwei Wang Dayong Liu Qingzhao Wang |
| author_sort | Zhiming Wang |
| collection | DOAJ |
| description | Ferric stearate (FeSt<sub>3</sub>) is very efficient in accelerating polyethylene (PE) degradation, but there is a lack of exploration of its role in accelerating the early stages of polyethylene photo-oxidative degradation. This study aimed to investigate the effect of FeSt<sub>3</sub> on the photo-oxidative degradation of PE films, especially in the early stages of photo-oxidative degradation. The results show that FeSt<sub>3</sub> not only promotes the oxidative degradation of PE but also contributes significantly to the early behavior of photo-oxidative degradation. Moreover, the results of the density functional theory (DFT) calculations proved that the C-H in the FeSt<sub>3</sub> ligand was more easily dissociated compared with the PE matrix. The generated H radicals participate in the coupling reaction of the primary alkyl macro radicals leading to the molecular weight reduction, thus significantly increasing the initial rate of molecular weight reduction of PE. Meanwhile, the transfer reaction of the dissociation-generated C-centered radicals induced the PE matrix to produce more secondary alkyl macroradicals, which shortened the time to enter the oxidative degradation stage. This finding reveals the mechanism by which FeSt<sub>3</sub> promotes the degradation of PE at the early stage of photo-oxidative degradation. It provides guiding significance for the in-depth study of the early degradation behavior in photo-oxidative degradation on polyolefin/FeSt<sub>3</sub> films. |
| first_indexed | 2024-03-10T22:12:17Z |
| format | Article |
| id | doaj.art-55cac7b8118b474fa3bfa0e585fc45a2 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T22:12:17Z |
| publishDate | 2023-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-55cac7b8118b474fa3bfa0e585fc45a22023-11-19T12:34:10ZengMDPI AGPolymers2073-43602023-09-011518367210.3390/polym15183672Peculiarity of the Mechanism of Early Stages of Photo-Oxidative Degradation of Linear Low-Density Polyethylene Films in the Presence of Ferric StearateZhiming Wang0Zhongwei Wang1Dayong Liu2Qingzhao Wang3College of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao 266590, ChinaCollege of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266042, ChinaCollege of Chemistry and Pharmaceutical Engineering, Huanghuai University, Zhumadian 466300, ChinaCollege of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao 266590, ChinaFerric stearate (FeSt<sub>3</sub>) is very efficient in accelerating polyethylene (PE) degradation, but there is a lack of exploration of its role in accelerating the early stages of polyethylene photo-oxidative degradation. This study aimed to investigate the effect of FeSt<sub>3</sub> on the photo-oxidative degradation of PE films, especially in the early stages of photo-oxidative degradation. The results show that FeSt<sub>3</sub> not only promotes the oxidative degradation of PE but also contributes significantly to the early behavior of photo-oxidative degradation. Moreover, the results of the density functional theory (DFT) calculations proved that the C-H in the FeSt<sub>3</sub> ligand was more easily dissociated compared with the PE matrix. The generated H radicals participate in the coupling reaction of the primary alkyl macro radicals leading to the molecular weight reduction, thus significantly increasing the initial rate of molecular weight reduction of PE. Meanwhile, the transfer reaction of the dissociation-generated C-centered radicals induced the PE matrix to produce more secondary alkyl macroradicals, which shortened the time to enter the oxidative degradation stage. This finding reveals the mechanism by which FeSt<sub>3</sub> promotes the degradation of PE at the early stage of photo-oxidative degradation. It provides guiding significance for the in-depth study of the early degradation behavior in photo-oxidative degradation on polyolefin/FeSt<sub>3</sub> films.https://www.mdpi.com/2073-4360/15/18/3672ferric stearatemechanismPE/FeSt<sub>3</sub> filmsphoto-oxidative degradationDFT calculations |
| spellingShingle | Zhiming Wang Zhongwei Wang Dayong Liu Qingzhao Wang Peculiarity of the Mechanism of Early Stages of Photo-Oxidative Degradation of Linear Low-Density Polyethylene Films in the Presence of Ferric Stearate Polymers ferric stearate mechanism PE/FeSt<sub>3</sub> films photo-oxidative degradation DFT calculations |
| title | Peculiarity of the Mechanism of Early Stages of Photo-Oxidative Degradation of Linear Low-Density Polyethylene Films in the Presence of Ferric Stearate |
| title_full | Peculiarity of the Mechanism of Early Stages of Photo-Oxidative Degradation of Linear Low-Density Polyethylene Films in the Presence of Ferric Stearate |
| title_fullStr | Peculiarity of the Mechanism of Early Stages of Photo-Oxidative Degradation of Linear Low-Density Polyethylene Films in the Presence of Ferric Stearate |
| title_full_unstemmed | Peculiarity of the Mechanism of Early Stages of Photo-Oxidative Degradation of Linear Low-Density Polyethylene Films in the Presence of Ferric Stearate |
| title_short | Peculiarity of the Mechanism of Early Stages of Photo-Oxidative Degradation of Linear Low-Density Polyethylene Films in the Presence of Ferric Stearate |
| title_sort | peculiarity of the mechanism of early stages of photo oxidative degradation of linear low density polyethylene films in the presence of ferric stearate |
| topic | ferric stearate mechanism PE/FeSt<sub>3</sub> films photo-oxidative degradation DFT calculations |
| url | https://www.mdpi.com/2073-4360/15/18/3672 |
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