Composites of Recycled Polypropylene from Cotton Swab Waste with Pyrolyzed Rice Husk
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ORIGINAL PAPER
Composites of Recycled Polypropylene from Cotton Swab Waste with Pyrolyzed Rice Husk Diego David Pinzón Moreno1 · Rayane Veloso de Camargo1 · Denise dos Santos Luiz1 · Lívia Teresinha Pimentel Branco1 · Camila Cezar Grillo1 · Clodoaldo Saron1 Accepted: 10 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The manufacture of consumer goods from thermoplastic polymers leads to a considerable amount of scrap or off-specifications products, generating post-industrial waste that is typically landfilled. In present study, polypropylene (PP) wastes from the cotton swabs manufacture were used to the preparation of polymeric composites with agro-industrial waste of rice husk (RH). The RH was employed in the natural form as well as it was also treated by controlled pyrolysis for surface modification before incorporation to the PP. The PP/RH composites prepared by extrusion with contents from 2 to 20 wt% of non-pyrolyzed (NRH) and pyrolyzed (PRH) rice husk were submitted to the injection molding for preparation of tensile and impact specimens and characterized by mechanical testing, thermal analysis, melt flow rate, infrared spectroscopy and scanning electron microscopy. The controlled pyrolysis treatment on the RH caused significant changes in the thermal, chemical, rheological and mechanical properties of the PP/RH composites, mainly on the mechanical properties Young’s modulus, elongation at break and impact resistance that presented variation up to 100% when compared the composites containing NRH. The recycled PP/RH composites present suitable properties for several applications such as wood-plastic, furniture, doors and are an alternative for decrease the pollution generated by cotton swab waste. Keywords Polypropylene waste · Rice husk · Composite · Controlled pyrolysis · Recycling
Introduction The reinforcement of recycled thermoplastics with natural fillers, generating polymeric composites, is an interesting alternative to countervail the property losses of the polymers due to the degradation effects or contaminations caused over time of their application and after discard as well as to adjust the properties of the material to specific applications. The polymeric composites can be directly prepared by thermomechanical processing in operations of mechanical recycling that itself is as one of the main recycling methods and that consequently represents an important way to mitigate environmental problems caused nowadays by polymeric waste [1–9]. * Clodoaldo Saron [email protected] 1
Department of Materials Engineering, Engineering School of Lorena, University of São Paulo, LOM-EEL/ USP, Polo Urbo Industrial, Gleba AI‑6, s/n, Lorena, SP CEP: 12602‑810, Brazil
Polypropylene (PP) PP is the second most consumed thermoplastic in the world, which is only surpassed by the polyethylene [5, 6, 10, 11]. In line with its consumption, the PP is also the second polymeric waste most discarded in the world, representing a serious environmental problem [12]. The development of
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