Encyclopedia of Polymer Composites: Properties, Performance and Applications

0364888 - ÚMCH 2012 RIV US eng M - Monography Chapter
Pilař, Jan - Pospíšil, Jan
Hindered amine stabilizers as sources of markers of the heterogeneous photooxidation/photostabilization of carbon chain polymers.
Encyclopedia of Polymer Composites: Properties, Performance and Applications. New York: Nova Science Publishers, 2011 - (Lechkov, M.; Prandzheva, S.), s. 1027-1042. Polymer Science and Technology. ISBN 978-1-60741-717-0
R&D Projects: GA AV ČR IAA400500804
Institutional research plan: CEZ:AV0Z40500505
Keywords : polymer photodegradation * polymer photostabilization * hindered amine stabilizers
Subject RIV: CD - Macromolecular Chemistry
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Application of Hindered Amine Stabilizers (HAS) is the state-of-the-art approach to protection of carbon-chain polymers such as polyolefins and polystyrene against weathering. During outdoor exposure, the polymers loose their material properties due to solar radiation-triggered photooxidation. 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, PP and Topas®. Depth profiles of nitroxides inside the polymer plaques during accelerated weathering were monitored using ESRI technique. The shape of the profiles was interpreted in terms of the limited both oxygen diffusion and radiation penetration into polymer plaques. The data indicate differences in the character of the heterogeneous process in dependence on the polymer matrix and on the HAS based stabilizer system.
Permanent Link: http://hdl.handle.net/11104/0006571