Abstract
Polyolefin-lignocellulosic composites have been widely investigated in recent decades. However, the properties analyses have not considered the interactions between compatibilizer and stabilizing agents when such composites are submitted to artificial aging. This investigation aims to evaluate the interaction between two types of light stabilizers and polypropylene grafted with maleic anhydride (compatibilizer) in coir fiber polypropylene composites. In this regard, a systematic study is proposed. Compatibilized and non-compatibilized coir fiber reinforced polypropylene composites (PP/FCo), containing different stabilizing systems based on UV absorber (Hostavin® ARO 8) and hindered amines, HALS (Tinuvin® 791), were prepared in a co-rotating twin-screw and subsequently submitted to ultraviolet B (UVB) and xenon arc accelerated artificial weathering. The action of the stabilizer systems and the influence of artificial weathering exposure were verified by means of mechanical properties, scanning electron microscopy (SEM) and colorimetric analysis (CIELAB system). A combination of UV absorber + HALS produced a synergistic effect as to the protection of PP and compatibilized and non-compatibilized coir-fiber reinforced PP, resulting in greater retention in mechanical properties, less incidence of cracks and greater resistance to total color increase (ΔE*) and gloss loss (ΔG*). Moreover, despite the fact that mechanical and color changes analysis did not indicate trapping of HALS and decrease in stabilization efficiency in the presence of compatibilizer, SEM images suggest increased degradation of the compatibilized composite containing HALS stabilizer.
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This study was financed by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001.
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Staffa, L.H., Agnelli, J.A.M., de Souza, M.L. et al. Considerations about the role of compatibilizer in coir fiber polypropylene composites containing different stabilization systems when submitted to artificial weathering. Cellulose 27, 9409–9422 (2020). https://doi.org/10.1007/s10570-020-03447-5
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DOI: https://doi.org/10.1007/s10570-020-03447-5