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Heterogeneity of accelerated photooxidation in commodity polymers stabilized by HAS: ESRI, IR, and MH study
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SYSNO ASEP 0427368 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Heterogeneity of accelerated photooxidation in commodity polymers stabilized by HAS: ESRI, IR, and MH study Author(s) Pilař, Jan (UMCH-V) RID, ORCID
Michálková, Danuše (UMCH-V)
Šlouf, Miroslav (UMCH-V) RID, ORCID
Vacková, Taťana (UMCH-V) RID
Dybal, Jiří (UMCH-V) RID, ORCIDSource Title Polymer Degradation and Stability. - : Elsevier - ISSN 0141-3910
Roč. 103, May (2014), s. 11-25Number of pages 15 s. Language eng - English Country NL - Netherlands Keywords hindered amine stabilizers ; heterogeneity of photooxidation ; electron spin resonance imaging Subject RIV BO - Biophysics R&D Projects GA202/09/2078 GA ČR - Czech Science Foundation (CSF) Institutional support UMCH-V - RVO:61389013 UT WOS 000336006300002 EID SCOPUS 84896922127 DOI 10.1016/j.polymdegradstab.2014.02.019 Annotation Heterogeneity of the photooxidation processes in plaques made of four commodity polymers, polypropylene (PP), polyethylene (PE), polystyrene (PS) and poly(ethylene-co-norbornene) (Topas®, TP) stabilized with hindered amine stabilizer (HAS) were studied using Electron Spin Resonance Imaging (ESRI) and three independent microscopic-scale methods: scanning electron microscopy (SEM), infrared microscopy (IR) and microhardness (MH). Concentration profiles of nitroxides mapping photooxidation process inside polymer plaques along the direction perpendicular to their surface were determined by electron spin resonance imaging technique (ESRI) in dependence on the duration of accelerated photooxidation. We present data characterizing stabilization activity of Chimassorb® 119, Chimassorb® 944, Tinuvin® 770 in combination with UV stabilizer Tinuvin® 320 or Tinuvin® 327, nitroxide HAS Prostab® 5415, and alkoxyamine derivative of HAS Tinuvin® NOR 371 and compare them with the previously published data. Comparison of profiles of oxidation products, crystallinity and microhardness measured inside the aged plaques made of non-stabilized semicrystalline polymers PE and PP and inside the plaques made of the polymers stabilized with Chimassorb® 944 together with SEM micrographs of the irradiated surface layers were found to confirm efficacy of the stabilizer used. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2015
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