NOR and nitroxide-based HAS in accelerated photooxidation of carbon-chain polymers; comparison with secondary HAS: an ESRI and ATR FTIR study

0359226 - ÚMCH 2012 RIV NL eng J - Journal Article
Pilař, Jan - Michálková, Danuše - Šeděnková, Ivana - Pfleger, Jiří - Pospíšil, Jan
NOR and nitroxide-based HAS in accelerated photooxidation of carbon-chain polymers; comparison with secondary HAS: an ESRI and ATR FTIR study.
Polymer Degradation and Stability. Roč. 96, č. 5 (2011), s. 847-862. ISSN 0141-3910. E-ISSN 1873-2321
R&D Projects: GA AV ČR IAA400500804
Institutional research plan: CEZ:AV0Z40500505
Keywords : commodity carbon-chain polymers * photodegradation * accelerated weathering
Subject RIV: CD - Macromolecular Chemistry
Impact factor: 2.769, year: 2011

Modern physical techniques were adopted for studies of spatial distribution of intermediates and products of photodegradation of four commodity polymers (polypropylene, polyethylene, polystyrene and poly(ethylene-co-norbornene)) stabilized with hindered amine stabilizer (HAS). HAS stabilization activity in polymers subjected to photooxidation is indicated by appearance of nitroxides. Concentration profiles of nitroxides inside polymer plaques subjected to accelerated weathering as a function of the weathering exposure time were determined by electron spin resonance imaging (ESRI). Stabilization activity of three alkoxyamine derivatives of HAS (Tinuvin®NOR 123, Tinuvin®NOR 371, Flamestab®NOR 116), Chimasorb®119 structurally similar to Flamestab®NOR 116, and nitroxide-based HAS Dastib®1045 was studied and compared with the secondary HAS Tinuvin®770. ESRI data were complemented by ATR FTIR detection of oxidation products and by diffusive optical transmittance of the polymer plaques.
Permanent Link: http://hdl.handle.net/11104/0197053