Počet záznamů: 1

Exploitation of modern physical techniques in characterization of accelerated weathering processes in commodity polymers; ESRI, ATR FTIR and diffuse transmittance measurements

  1. 1.
    0364739 - UMCH-V 2012 RIV DE eng C - Konferenční příspěvek (zahraniční konf.)
    Pilař, Jan - Šeděnková, Ivana - Pfleger, Jiří - Michálková, Danuše
    Exploitation of modern physical techniques in characterization of accelerated weathering processes in commodity polymers; ESRI, ATR FTIR and diffuse transmittance measurements.
    Natural and Artificial Ageing of Polymers. Vol. Publication No15. Pfinztal: Confederation of European Environmental Engineering Societies (CEEES) - Gesellschaft für Umweltsimulation GUS, 2011 - (Reichert, T.), s. 359-369. ISBN 978-3-9813136-2-8.
    [European Weathering Symposium /5./. Lisbon (PT), 21.09.2011-23.09.2011]
    Grant CEP: GA AV ČR IAA400500804
    Výzkumný záměr: CEZ:AV0Z40500505
    Klíčová slova: commodity polymers * photodegradation * diffuse transmittance
    Kód oboru RIV: CD - Makromolekulární chemie
    http://www.weathering-symposium.org/books/books.htm

    Weathering of polymers comprises a large number of photooxidation processes triggered by environmental factors. It accounts for heterogeneous photodegradation that has negative impact on material properties of polymers. The degradation can be minimized by application of stabilizers, hindered amine stabilizers (HAS) in particular. We applied modern physical techniques that are able to bring unique information on the heterogeneity of the degradation process. Development of concentration profiles of nitroxides inside polymer plaques and concentrations of oxidation products on the surfaces and inside the plaques were determined by ESRI and by ATR FTIR, respectively. Diffuse optical transmission of the plaques was determined using spectrophotometer equipped with an integration sphere. Data determined in four commodity carbon chain polymers PP, PE, PS and Topas® stabilized with secondary HAS Tinuvin® 770 and with Tinuvin® NOR 123 are compared.
    Trvalý link: http://hdl.handle.net/11104/0200140