Počet záznamů: 1
Degradation processes in polyolefins with phenolic stabilizers subjected to ionizing or non-ionizing radiation
- 1.
SYSNO ASEP 0583350 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Degradation processes in polyolefins with phenolic stabilizers subjected to ionizing or non-ionizing radiation Tvůrce(i) Šlouf, Miroslav (UMCH-V) RID, ORCID
Gajdošová, Veronika (UMCH-V) RID, ORCID
Šloufová, I. (CZ)
Lukešová, Miroslava (UMCH-V) RID, ORCID
Michálková, Danuše (UMCH-V)
Müller, M. T. (DE)
Pilař, Jan (UMCH-V) RID, ORCIDČíslo článku 110708 Zdroj.dok. Polymer Degradation and Stability. - : Elsevier - ISSN 0141-3910
Roč. 222, April (2024)Poč.str. 20 s. Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova high-density polyethylene (HDPE) ; cycloolefin copolymer (COC) ; natural phenolic stabilizers Vědní obor RIV CD - Makromolekulární chemie Obor OECD Polymer science CEP NU21-06-00084 GA MZd - Ministerstvo zdravotnictví FW01010564 GA TA ČR - Technologická agentura ČR Způsob publikování Omezený přístup Institucionální podpora UMCH-V - RVO:61389013 UT WOS 001200401100001 EID SCOPUS 85186119123 DOI 10.1016/j.polymdegradstab.2024.110708 Anotace We investigated degradation processes in polymer plaques made of polyolefin (HDPE or UHMWPE or COC) prepared by melt-mixing with or without phenolic stabilizer (natural α-tocopherol or synthetic Irganox®1010) and spin trapping agent (TTBNB, 2,4,6-Tri‑tert-butylnitrosobenzene). The degradation was initiated either by low-energy, non-ionizing radiation (wavelengths corresponding to terrestrial range of solar UV radiation) or high-energy, ionizing radiation (electrons accelerated at 1.5 MeV). The motivation for the study was our recent finding that some phenolic stabilizers exhibited a surprising pro-oxidant activity in polyolefins subjected to non-ionizing radiation. Consequently, we asked if the phenolic stabilizers in polyolefins behave in the same way during long-term, low-energy, non-ionizing UV irradiation and after short-term, high-energy, ionizing e-beam irradiation. All samples were characterized thoroughly by means of electron spin resonance (ESR, the information about radiation-induced radicals), infrared microspectroscopy (IR, the detection of oxidation products and structural changes), instrumented microindentation (MHI, local mechanical properties) and light and electron microscopy (LM and SEM, surface morphology). The results proved that (i) the degradation processes in polyolefins subjected to non-ionizing or ionizing radiation were different, (ii) the phenolic stabilizers exhibited mostly their expected antioxidant activity, while pro-oxidant activity was detected only for specific conditions and/or systems subjected to non-ionizing radiation, and (iii) the selected spin trapping agent, TTBNB, was stable enough to survive standard sample preparation by melt-mixing and catch short-living unstable radicals. Pracoviště Ústav makromolekulární chemie Kontakt Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Rok sběru 2025 Elektronická adresa https://www.sciencedirect.com/science/article/pii/S0141391024000521?via%3Dihub
Počet záznamů: 1