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Statements

Subject Item
n2:RIV%2F61389013%3A_____%2F11%3A00435836%21RIV15-AV0-61389013
rdf:type
skos:Concept n15:Vysledek
dcterms:description
Application of Hindered Amine Stabilizers (HAS) is the state-of-the-art approach to protection of carbon-chain polymers such as polyolefins and polystyrene or blends containing these against weathering. During outdoor exposure, the polymers loose their material properties due to solar radiation-triggered photooxidation. The complex mechanism of the stabilization involving cyclic oxidation-triggered transformation of HAS is outlined. Monitoring of the formation of the HAS-developed key transformation products, HAS-related nitroxides, responsible within the regenerative mechanism for the effective stabilization was used to confirm the heterogeneous character of photooxidation of two carbon-chain polymers, polypropylene and a specific polyethylene copolymer. Depth profiles of nitroxides were monitored in a long-term photooxidation regime using Electron Spin Resonance Imaging (ESRI) technique. The shape of concentration profiles of the nitroxides accumulated in the equilibrium state upon filtered Xenon lamp-equipped Weather-Ometer exposure was interpreted in terms of the oxygen diffusion limited oxidation and radiation penetration in oxidation-stressed polymer surfaces. The data indicate differences in the character of the heterogeneous process in dependence on the polymer matrix and on the used stabilizer system based on secondary HAS and O-alkylhydroxylamine HAS and/or HAS combination with UV absorbers. Imaging of nitroxides is a precise tool for marking heterogeneous oxidation of polyolefins. Application of Hindered Amine Stabilizers (HAS) is the state-of-the-art approach to protection of carbon-chain polymers such as polyolefins and polystyrene or blends containing these against weathering. During outdoor exposure, the polymers loose their material properties due to solar radiation-triggered photooxidation. The complex mechanism of the stabilization involving cyclic oxidation-triggered transformation of HAS is outlined. Monitoring of the formation of the HAS-developed key transformation products, HAS-related nitroxides, responsible within the regenerative mechanism for the effective stabilization was used to confirm the heterogeneous character of photooxidation of two carbon-chain polymers, polypropylene and a specific polyethylene copolymer. Depth profiles of nitroxides were monitored in a long-term photooxidation regime using Electron Spin Resonance Imaging (ESRI) technique. The shape of concentration profiles of the nitroxides accumulated in the equilibrium state upon filtered Xenon lamp-equipped Weather-Ometer exposure was interpreted in terms of the oxygen diffusion limited oxidation and radiation penetration in oxidation-stressed polymer surfaces. The data indicate differences in the character of the heterogeneous process in dependence on the polymer matrix and on the used stabilizer system based on secondary HAS and O-alkylhydroxylamine HAS and/or HAS combination with UV absorbers. Imaging of nitroxides is a precise tool for marking heterogeneous oxidation of polyolefins.
dcterms:title
Hindered amine stabilizers as sources of markers of the heterogeneous photooxidation/photostabilization of carbon chain polymers Hindered amine stabilizers as sources of markers of the heterogeneous photooxidation/photostabilization of carbon chain polymers
skos:prefLabel
Hindered amine stabilizers as sources of markers of the heterogeneous photooxidation/photostabilization of carbon chain polymers Hindered amine stabilizers as sources of markers of the heterogeneous photooxidation/photostabilization of carbon chain polymers
skos:notation
RIV/61389013:_____/11:00435836!RIV15-AV0-61389013
n3:aktivita
n12:Z
n3:aktivity
Z(AV0Z40500505)
n3:dodaniDat
n6:2015
n3:domaciTvurceVysledku
n11:6499309 n11:1460021
n3:druhVysledku
n14:C
n3:duvernostUdaju
n19:S
n3:entitaPredkladatele
n18:predkladatel
n3:idSjednocenehoVysledku
202111
n3:idVysledku
RIV/61389013:_____/11:00435836
n3:jazykVysledku
n17:eng
n3:klicovaSlova
polymer photodegradation; polymer photostabilization; hindered amine stabilizers
n3:klicoveSlovo
n13:polymer%20photodegradation n13:polymer%20photostabilization n13:hindered%20amine%20stabilizers
n3:kontrolniKodProRIV
[3716E9D5E876]
n3:mistoVydani
Hauppauge
n3:nazevZdroje
Polymer Aging, Stabilizers and Amphiphilic Block Copolymers
n3:obor
n4:CD
n3:pocetDomacichTvurcuVysledku
2
n3:pocetStranKnihy
373
n3:pocetTvurcuVysledku
2
n3:rokUplatneniVysledku
n6:2011
n3:tvurceVysledku
Pospíšil, Jan Pilař, Jan
n3:zamer
n16:AV0Z40500505
s:numberOfPages
15
n10:hasPublisher
Nova Science Publishers
n9:isbn
978-1-60692-928-5