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Open AccessArticle

From Disposal to Technological Potential: Reuse of Polypropylene Waste from Industrial Containers as a Polystyrene Impact Modifier

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Academic Unit of Materials Engineering, Federal University of Campina Grande, 58429-900 Campina Grande, Paraíba, Brazil
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Academic Unit of Mechanical Engineering, Federal University of Campina Grande, 58429-900 Campina Grande, Paraíba, Brazil
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Author to whom correspondence should be addressed.
Sustainability 2020, 12(13), 5272; https://doi.org/10.3390/su12135272
Received: 10 April 2020 / Revised: 14 May 2020 / Accepted: 26 May 2020 / Published: 29 June 2020
(This article belongs to the Special Issue Recycling for Circularity and Sustainability)
The practice of recycling over the years has been increasingly encouraged, with the aim being the manufacturing of materials that contribute to sustainable development. In light of this, the present work evaluated the potential of mixtures of polystyrene (PS)/recycled copolymer polypropylene (PPr), using styrene-(ethylene/butylene)-styrene (SEBS) as a compatibilizing agent. Initially, the mixtures were prepared in a co-rotational twin-screw extruder, and, afterwards, the extruded granules were molded by injection. The properties of torque rheometry, impact strength, tensile properties, differential scanning calorimetry (DSC), heat deflection temperature (HDT), and scanning electron microscopy (SEM) were evaluated. The formulation PS/PPr/SEBS (70/20/10 %wt.) demonstrated an increase in viscosity, corroborating with an increase of 123% and 227% in the elongation at break and impact strength, respectively, compared to neat PS. Though the elastic modulus and tensile strength suffered losses, the reduction was not drastic. Furthermore, the addition of a semi-crystalline recycled material in the amorphous matrix (PS) contributed to an increase in thermomechanical strength, as seen in the HDT. The morphology revealed that SEBS is effective in making PS/PPr mixtures compatible because the dispersed phase is well adhered to the PS matrix and promotes greater morphological stability. Thus, it is possible to add value to discarded material and reduce the costs of the final product, which can reduce pollution. View Full-Text
Keywords: sustainable development; polypropylene; reuse; impact modifier; polystyrene sustainable development; polypropylene; reuse; impact modifier; polystyrene
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Luna, C.B.B.; Siqueira, D.D.; Ferreira, E.S.B.; Silva, W.A.; Nogueira, J.A.S.; Araújo, E.M. From Disposal to Technological Potential: Reuse of Polypropylene Waste from Industrial Containers as a Polystyrene Impact Modifier. Sustainability 2020, 12, 5272.

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