Considerations about the role of compatibilizer in coir fiber polypropylene composites containing different stabilizatio
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ORIGINAL RESEARCH
Considerations about the role of compatibilizer in coir fiber polypropylene composites containing different stabilization systems when submitted to artificial weathering Lucas H. Staffa . Jose´ Augusto M. Agnelli . Miguel L. de Souza . Sı´lvia H. P. Bettini
Received: 15 May 2020 / Accepted: 8 September 2020 Ó Springer Nature B.V. 2020
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 (HostavinÒ ARO 8) and hindered amines, HALS (TinuvinÒ 791), were prepared in a co-rotating twinscrew and subsequently submitted to ultraviolet B (UVB) and xenon arc accelerated artificial weathering. The action of the stabilizer systems and the influence
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10570-020-03447-5) contains supplementary material, which is available to authorized users. L. H. Staffa (&) J. A. M. Agnelli S. H. P. Bettini Universidade Federal de Sa˜o Carlos, Washington Luiz, Km 235, Sa˜o Carlos, SP 13565-905, Brazil e-mail: [email protected] L. H. Staffa M. L. de Souza Newtech Assessoria, Consultoria e Prestac¸a˜o de Servic¸os S/S LTDA, Dom Pedro II, 676, Sa˜o Carlos, SP 13560-320, Brazil
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 (DE*) and gloss loss (DG*). 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. Keywords Natural composites Coir fiber Polypropylene Artificial weathering Ultraviolet B Xenon arc
Introduction Demand for sustainable, lighter and recyclable products is increasing and the use of lignocellulosic fibers as reinforcement in polymer matrices has become increasingly noteworthy due to their abundance, nonabrasiveness, low relative density, recyclability, biodegradability, low cost and variety of excellent
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