Automotive industries are increasingly interested in learning how to prolong the clearcoat resin lifetime and avoid its thermal, photochemical, and chemical degradation. While chemical degradation by acid rain has been well known since the beginning of the decade and the subject of many studies, chemical degradation of the automotive clearcoat by living organisms (except by bird droppings) is a newly recognized problem. In this work, we report the chemical degradation of the automotive clearcoat caused by oviposition of dragonflies. These insects, very common in Brazil, are attracted by the reflecting surface of cars exposen in the sun and lay eggs on them. We observed that the eggs, at the high temperatures (50 - 92 deg C) of the carsurface, can cause damage similar to that of acid rain. In experiments on resin-coated plates, we excluded the involvement of H2O2 - or hydroquinone - derived radicals, of enzyme-catalyzed hydrolysis, and of photosensitizer-induced damage. The damage was very similar, however, to that produced by the sulfur-containing amino acids, cysteine and cystine, at high temperature. Due to this similarity, and because the eggs are rich in sulfur amino acids, we propose a mechanism involving cysteine and cystine residues in the clearcoat damage.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Automotive clearcoat damage due to oviposition of dragonflies


    Weitere Titelangaben:

    Die Beschädigung transparenter Kunststoffüberzüge von Automobilen durch die Eiablage von Libellen


    Beteiligte:
    Stevani, C.V. (Autor:in) / Porto, J.S. (Autor:in) / Trindade, D.J. (Autor:in) / Bechara, E.J.H. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2000


    Format / Umfang :

    8 Seiten, 6 Bilder, 2 Tabellen, 16 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    2K Clearcoat for Automotive Plastics

    Krueger, Keri / Caillouette, Lyle A. | SAE Technical Papers | 1997


    USCAR: Automotive powder clearcoat experience

    Meschievitz, T.A. / Pearson, R.F. / McLaughlin, E.O. | Tema Archiv | 1997


    2K Clearcoat for automotive plastics

    Caillouette,L.A. / Krueger,K. / BASF,Ludwigshafen,DE | Kraftfahrwesen | 1997


    2K Clearcoat for Automotive Plastics

    Caillouette, L. A. / Krueger, K. / SAE | British Library Conference Proceedings | 1997


    Clearcoat evaluation

    Jenkins,J.W. / Kane,K.M. / General Motors,US,DuPont Automotive,US | Kraftfahrwesen | 1998