Pro-oxidant activity of biocompatible catechin stabilizer during photooxidation of polyolefins
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F21%3A00546299" target="_blank" >RIV/61389013:_____/21:00546299 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S014139102100255X?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S014139102100255X?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.polymdegradstab.2021.109735" target="_blank" >10.1016/j.polymdegradstab.2021.109735</a>
Alternative languages
Result language
angličtina
Original language name
Pro-oxidant activity of biocompatible catechin stabilizer during photooxidation of polyolefins
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10404 - Polymer science
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Polymer Degradation and Stability
ISSN
0141-3910
e-ISSN
1873-2321
Volume of the periodical
193
Issue of the periodical within the volume
November
Country of publishing house
GB - UNITED KINGDOM
Number of pages
22
Pages from-to
109735
UT code for WoS article
000708927500001
EID of the result in the Scopus database
2-s2.0-85116546151