{"title":"具有酮基的线性聚乙烯光降解性：侧链羰基比内链羰基效率更高。","authors":"Haobo Yuan, Kohei Takahashi, Shintaro Nakagawa, Naoko Yoshie and Kyoko Nozaki*, ","doi":"10.1021/acsmacrolett.5c00476","DOIUrl":null,"url":null,"abstract":"<p >In this study, linear polyethylenes bearing ketone groups in their side-chains were prepared by palladium-catalyzed copolymerization of ethylene and methyl vinyl ketone (poly(E/MVK)) and the photodegradation behavior was compared with polyethylene bearing in-chain carbonyl groups (poly(E/CO)). Poly(E/MVK) showed a faster photodegradation rate and a more significant decrease of the molecular weight than poly(E/CO). By <sup>1</sup>H NMR analysis, both Norrish type I and type II scissions are involved for the degradation of poly(E/MVK), probably due to the existence of MVK groups in amorphous region, which is preferable for the radical chain reactions and the main chain cleavage. The codegradation in a blend of poly(E/MVK) and HDPE was also demonstrated.</p>","PeriodicalId":18,"journal":{"name":"ACS Macro Letters","volume":"14 9","pages":"1323–1328"},"PeriodicalIF":5.2000,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Linear Polyethylene with Ketone Groups for Photodegradability: Higher Efficiency with Side-Chain Carbonyls than In-Chain\",\"authors\":\"Haobo Yuan, Kohei Takahashi, Shintaro Nakagawa, Naoko Yoshie and Kyoko Nozaki*, \",\"doi\":\"10.1021/acsmacrolett.5c00476\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >In this study, linear polyethylenes bearing ketone groups in their side-chains were prepared by palladium-catalyzed copolymerization of ethylene and methyl vinyl ketone (poly(E/MVK)) and the photodegradation behavior was compared with polyethylene bearing in-chain carbonyl groups (poly(E/CO)). Poly(E/MVK) showed a faster photodegradation rate and a more significant decrease of the molecular weight than poly(E/CO). By <sup>1</sup>H NMR analysis, both Norrish type I and type II scissions are involved for the degradation of poly(E/MVK), probably due to the existence of MVK groups in amorphous region, which is preferable for the radical chain reactions and the main chain cleavage. The codegradation in a blend of poly(E/MVK) and HDPE was also demonstrated.</p>\",\"PeriodicalId\":18,\"journal\":{\"name\":\"ACS Macro Letters\",\"volume\":\"14 9\",\"pages\":\"1323–1328\"},\"PeriodicalIF\":5.2000,\"publicationDate\":\"2025-09-03\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"ACS Macro Letters\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://pubs.acs.org/doi/10.1021/acsmacrolett.5c00476\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"POLYMER SCIENCE\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Macro Letters","FirstCategoryId":"92","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acsmacrolett.5c00476","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"POLYMER SCIENCE","Score":null,"Total":0}
Linear Polyethylene with Ketone Groups for Photodegradability: Higher Efficiency with Side-Chain Carbonyls than In-Chain
In this study, linear polyethylenes bearing ketone groups in their side-chains were prepared by palladium-catalyzed copolymerization of ethylene and methyl vinyl ketone (poly(E/MVK)) and the photodegradation behavior was compared with polyethylene bearing in-chain carbonyl groups (poly(E/CO)). Poly(E/MVK) showed a faster photodegradation rate and a more significant decrease of the molecular weight than poly(E/CO). By 1H NMR analysis, both Norrish type I and type II scissions are involved for the degradation of poly(E/MVK), probably due to the existence of MVK groups in amorphous region, which is preferable for the radical chain reactions and the main chain cleavage. The codegradation in a blend of poly(E/MVK) and HDPE was also demonstrated.
期刊介绍：
ACS Macro Letters publishes research in all areas of contemporary soft matter science in which macromolecules play a key role, including nanotechnology, self-assembly, supramolecular chemistry, biomaterials, energy generation and storage, and renewable/sustainable materials. Submissions to ACS Macro Letters should justify clearly the rapid disclosure of the key elements of the study. The scope of the journal includes high-impact research of broad interest in all areas of polymer science and engineering, including cross-disciplinary research that interfaces with polymer science.
With the launch of ACS Macro Letters, all Communications that were formerly published in Macromolecules and Biomacromolecules will be published as Letters in ACS Macro Letters.
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