Počet záznamů: 1

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

  1. 1.
    0359226 - UMCH-V 2012 RIV NL eng J - Článek v odborném periodiku
    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
    Grant CEP: GA AV ČR IAA400500804
    Výzkumný záměr: CEZ:AV0Z40500505
    Klíčová slova: commodity carbon-chain polymers * photodegradation * accelerated weathering
    Kód oboru RIV: CD - Makromolekulární chemie
    Impakt faktor: 2.769, rok: 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.
    Trvalý link: http://hdl.handle.net/11104/0197053