Study on the onset mechanism of bio-blister degradation of polyolefin by diatom attachment in seawater
Abstract It is essential to develop a mechanism for lowering the molecular weight of polyolefins to achieve biodegradation in seawater. In this study, a polypropylene/polylactic acid blend sample was first subjected to photodegradation pretreatment, and it was confirmed that in pure water, the acid...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2024-02-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-024-54668-8 |
| _version_ | 1797274795768807424 |
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| author | Hisayuki Nakatani Shun Narizumi Seiya Okubo Suguru Motokucho Anh Thi Ngoc Dao Hee-Jin Kim Mitsuharu Yagi Yusaku Kyozuka Shigenobu Miura Kanth V. Josyula |
| author_facet | Hisayuki Nakatani Shun Narizumi Seiya Okubo Suguru Motokucho Anh Thi Ngoc Dao Hee-Jin Kim Mitsuharu Yagi Yusaku Kyozuka Shigenobu Miura Kanth V. Josyula |
| author_sort | Hisayuki Nakatani |
| collection | DOAJ |
| description | Abstract It is essential to develop a mechanism for lowering the molecular weight of polyolefins to achieve biodegradation in seawater. In this study, a polypropylene/polylactic acid blend sample was first subjected to photodegradation pretreatment, and it was confirmed that in pure water, the acid generated promotes the polypropylene degradation (autoxidation), while in alkaline seawater, the promotion was inhibited by a neutralization reaction. In the autoxidation of polyolefins in alkaline seawater, aqueous Cl− was also the inhibitor. However, we found that autoxidation could be initiated even in seawater by lowering the pH and using dissociation of ClOH (called blister degradation). The blister degradation mechanism enabled autoxidation, even in seawater, by taking advantage of the ability of diatoms to secrete transparent exopolymer particles (TEP) to prevent direct contact between the surface layer of polyolefins and alkaline seawater. We named blister degradation in seawater with diatoms as bio-blister degradation and confirmed its manifestation using linear low-density polyethylene (LLDPE)/starch samples by SEM, IR, DSC and GPC analysis. |
| first_indexed | 2024-03-07T15:03:06Z |
| format | Article |
| id | doaj.art-2bf8eb1f1207495fb57ce5bba8e78eec |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-03-07T15:03:06Z |
| publishDate | 2024-02-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-2bf8eb1f1207495fb57ce5bba8e78eec2024-03-05T19:00:10ZengNature PortfolioScientific Reports2045-23222024-02-0114111110.1038/s41598-024-54668-8Study on the onset mechanism of bio-blister degradation of polyolefin by diatom attachment in seawaterHisayuki Nakatani0Shun Narizumi1Seiya Okubo2Suguru Motokucho3Anh Thi Ngoc Dao4Hee-Jin Kim5Mitsuharu Yagi6Yusaku Kyozuka7Shigenobu Miura8Kanth V. Josyula9Polymeri Materials Laboratory, Chemistry and Materials Engineering Program, Nagasaki UniversityPolymeri Materials Laboratory, Chemistry and Materials Engineering Program, Nagasaki UniversityPolymeri Materials Laboratory, Chemistry and Materials Engineering Program, Nagasaki UniversityPolymeri Materials Laboratory, Chemistry and Materials Engineering Program, Nagasaki UniversityPolymeri Materials Laboratory, Chemistry and Materials Engineering Program, Nagasaki UniversityGraduate School of Fisheries and Environmental Sciences, Nagasaki UniversityGraduate School of Fisheries and Environmental Sciences, Nagasaki UniversityOrganization for Marine Science and Technology, Nagasaki UniversityBioLogiQ Japan LLCBioLogiQ, Inc.Abstract It is essential to develop a mechanism for lowering the molecular weight of polyolefins to achieve biodegradation in seawater. In this study, a polypropylene/polylactic acid blend sample was first subjected to photodegradation pretreatment, and it was confirmed that in pure water, the acid generated promotes the polypropylene degradation (autoxidation), while in alkaline seawater, the promotion was inhibited by a neutralization reaction. In the autoxidation of polyolefins in alkaline seawater, aqueous Cl− was also the inhibitor. However, we found that autoxidation could be initiated even in seawater by lowering the pH and using dissociation of ClOH (called blister degradation). The blister degradation mechanism enabled autoxidation, even in seawater, by taking advantage of the ability of diatoms to secrete transparent exopolymer particles (TEP) to prevent direct contact between the surface layer of polyolefins and alkaline seawater. We named blister degradation in seawater with diatoms as bio-blister degradation and confirmed its manifestation using linear low-density polyethylene (LLDPE)/starch samples by SEM, IR, DSC and GPC analysis.https://doi.org/10.1038/s41598-024-54668-8 |
| spellingShingle | Hisayuki Nakatani Shun Narizumi Seiya Okubo Suguru Motokucho Anh Thi Ngoc Dao Hee-Jin Kim Mitsuharu Yagi Yusaku Kyozuka Shigenobu Miura Kanth V. Josyula Study on the onset mechanism of bio-blister degradation of polyolefin by diatom attachment in seawater Scientific Reports |
| title | Study on the onset mechanism of bio-blister degradation of polyolefin by diatom attachment in seawater |
| title_full | Study on the onset mechanism of bio-blister degradation of polyolefin by diatom attachment in seawater |
| title_fullStr | Study on the onset mechanism of bio-blister degradation of polyolefin by diatom attachment in seawater |
| title_full_unstemmed | Study on the onset mechanism of bio-blister degradation of polyolefin by diatom attachment in seawater |
| title_short | Study on the onset mechanism of bio-blister degradation of polyolefin by diatom attachment in seawater |
| title_sort | study on the onset mechanism of bio blister degradation of polyolefin by diatom attachment in seawater |
| url | https://doi.org/10.1038/s41598-024-54668-8 |
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