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Pro-oxidant activity of biocompatible catechin stabilizer during photooxidation of polyolefins
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SYSNO ASEP 0546299 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Pro-oxidant activity of biocompatible catechin stabilizer during photooxidation of polyolefins Author(s) Gajdošová, Veronika (UMCH-V) RID, ORCID
Šlouf, Miroslav (UMCH-V) RID, ORCID
Michálková, Danuše (UMCH-V)
Dybal, Jiří (UMCH-V) RID, ORCID
Pilař, Jan (UMCH-V) RID, ORCIDArticle number 109735 Source Title Polymer Degradation and Stability. - : Elsevier - ISSN 0141-3910
Roč. 193, November (2021)Number of pages 22 s. Language eng - English Country GB - United Kingdom Keywords high-density polyethylene (HDPE) ; cycloolefin copolymer (COC) ; natural phenolic stabilizers Subject RIV CD - Macromolecular Chemistry OECD category Polymer science R&D Projects NU21-06-00084 GA MZd - Ministry of Health (MZ) FW01010564 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) Method of publishing Limited access Institutional support UMCH-V - RVO:61389013 UT WOS 000708927500001 EID SCOPUS 85116546151 DOI 10.1016/j.polymdegradstab.2021.109735 Annotation Polymer plaques made of high-density polyethylene (HDPE) or cycloolefin copolymer (COC) were stabilized with natural phenolic stabilizer (+)-catechin (CAT) and aged using accelerated weathering technique (WOM, accelerated photooxidation). The efficiency of the phenolic stabilizer was compared with a well-established hindered amine stabilizer (HAS) Tinuvin®770 (Tin770). In pursuit of the stabilization and identification of short-living radicals generated in the process of photooxidation of the polymers, a spin trapping agent 2,4,6-tri-tert-butylnitrosobenzene (TTBNB) was added to selected samples. Profiles of oxidation products and crystallinity inside the HDPE plaques were determined by IR microspectroscopy, oxidation products in COC copolymers were identified using ATR spectroscopy, concentration profiles of radicals generated inside polymer plaques during WOM exposure were determined by ESRI, the changes of local mechanical properties at the surface of polymer plaques were characterized using microindentation hardness testing (MHI), and the surface morphology changes were studied by light and/or scanning electron microscopy. All methods are in accordance with the conclusion that the natural phenolic stabilizer CAT exhibited pro-oxidant activity during accelerated photooxidation of both polymers, i.e. higher concentration of oxidation products, bigger changes of local mechanical properties and/or more microcracks on the exposed surfaces in comparison with non-stabilized systems and systems stabilized with Tin770. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2022 Electronic address https://www.sciencedirect.com/science/article/pii/S014139102100255X?via%3Dihub
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