Effect of the Recycled Rubber on the Properties of Recycled Rubber/Recycled Polypropylene Blends

The vulcanized rubber waste from the shoe industry causes environmental damage when it is incinerated or inappropriately discarded, turning this into a problem of major concern. Therefore, this study had as the main objective the Polystyrene (PS) toughening using different contents of white vulcanized styrene-butadiene rubber (SBRr) waste produced in the shoe industry. The mixtures were initially prepared in a co-rotational double screw extruder and, thereafter, the extruded granules were injection molded. Analyzed were the rheological, mechanical, thermomechanical properties and morphology of the produced blends. The rheological results showed a viscosity increase as the SBRr concentration was augmented, leading to a higher stability when compared to pure Polystyrene. Verified was an increase of impact resistance of 189% to the blend that contained 50% of SBR rather than pure Polystyrene. On the other hand, the traction properties, hardness Shore D, thermal deflection temperature (HDT) and Vicat softening temperature of the blends tended to decrease when compared to pure Polystyrene results. However, as this SBR waste is made up of a complex mixture of SBR, filler, processing additions, curing agents and stabilizers, it probably acted in the sense of not causing such a drastic reduction of the properties, even using a high concentration of SBRr waste. The morphologies obtained with the SEM method (Scanning Electronic Microscope) were quite different and typical of immiscible blends. The results show that it is possible to obtain a new material with good properties, valuing a discarded industrial waste and avoiding environment aggression.

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“…In addition, it has a cross-linked structure, which prevents melting and reprocessing. Similar findings were also verified by Ciro et al (2015).…”

Section: Resultssupporting

confidence: 86%

Toughening of polystyrene using styrene-butadiene rubber (SBRr) waste from the shoe industry

et al. 2018

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“…Therefore, the degradation process is hindered and the overall stability of the blend is improved [63]. A similar synergistic effect in the improvement of thermal stability on polymer blends was previously observed among others by Calderon and Sobkowicz [53] in poly(propylene carbonate)/polyoxymethylene blends, and by Ciro et al [64] in recycled rubber/recycled polypropylene blends. Further increase in the PEF content up to 50% depresses the temperatures of both T d,5%, and T DTG1 towards values lying in-between temperatures found for homopolymers.…”

Section: Sample T G [supporting

confidence: 71%

Environmentally Friendly Polymer Blends Based on Post-Consumer Glycol-Modified Poly(Ethylene Terephthalate) (PET-G) Foils and Poly(Ethylene 2,5-Furanoate) (PEF): Preparation and Characterization

2020

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Environmentally friendly polymer blends between post-consumer PET-G and bio-based poly(ethylene 2,5 furanoate) (PEF) have been prepared. The PET-G granules were obtained from the post-consumer glycol-modified poly(ethylene terephthalate) PET-G foils from Nicrometal S.A. as a result of materials recycling. PEF was synthesized from dimethyl furan-2,5-dicarboxylate and 1,2-ethylene glycol (BioUltra) by a two-stage melt polycondensation process. According to the calculations followed by Hoy’s method, one has studied the miscibility of the components in the blend. The molecular structure of PET-G/PEF blends was analyzed by Fourier Transform Infrared Spectroscopy (FTIR) spectroscopy, while the morphology of the blends was determined by Scanning Electron Microscopy (SEM). To evaluate phase transition temperatures, as well as the thermal effects in PET-G/PEF blends, Differential Scanning Calorimetry (DSC), Dynamic Mechanical Thermal Analysis (DMTA), and Thermogravimetric Analysis (TGA), were performed. Tensile tests revealed that along with an increase in the amount of PEF, an increase in Young’s modulus was observed. Besides, the existence of interfacial interactions between polymers, especially in the case of PET-G/PEF 80/20, enabling the PET-G chains to form a network structure with the PEF by reacting with their functional groups, allows observation of a synergistic effect in the improvement of thermal stability and water absorption.

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“…In relation to the binary PS/SBRr blend, 50% of recycled rubber (SBRr) presented an increase in torque in relation to PS, which means an increase in viscosity. Ciro et al 38 correlates the elevation of viscosity with the increase of content in an elastomeric tire residue (SBR) inserted in a polypropylene matrix as SBR under vulcanization failed to melt. Therefore, the increase in viscosity of binary blends (PS/SBRr) in relation to the PS can also be attributed to the presence of 50% recycled rubber (SBRr) vulcanized in powder, which acts as a filler, causing an increase in blend viscosity.…”

Section: Characterizations Of Blends and Hipsmentioning

confidence: 99%

Incorporation of a recycled rubber compound from the shoe industry in polystyrene: Effect of SBS compatibilizer content

Luna

Araújo

Siqueira

et al. 2019

Journal of Elastomers & Plastics

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This research aimed to evaluate the influence of styrene–butadiene–styrene (SBS) compatibilizer in the polystyrene blends properties with a recycled styrene–butadiene rubber compound. The SBS content was 5, 7.5, and 10%. Commercial high-impact polystyrene (HIPS) was used for comparison. The results indicated that the viscosity of the blends was higher than that of HIPS. The blends compatibilized with 5 and 7.5% had the same level of impact strength as HIPS, while the one with 10% obtained a gain of 80% in relation to HIPS. The flexural strength, hardness, heat deflection temperature, and Vicat softening temperature properties were similar to those of HIPS, which was attributed to the presence of inorganic fillers, minimizing losses in these properties. By atomic force microscopy, two distinct phases were observed, and in the morphology analyzed through scanning electron microscopy, a typical characteristic of immiscible blends was observed.

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Effect of the Recycled Rubber on the Properties of Recycled Rubber/Recycled Polypropylene Blends

Cited by 14 publications

References 17 publications

Toughening of polystyrene using styrene-butadiene rubber (SBRr) waste from the shoe industry

Toughening of polystyrene using styrene-butadiene rubber (SBRr) waste from the shoe industry

Environmentally Friendly Polymer Blends Based on Post-Consumer Glycol-Modified Poly(Ethylene Terephthalate) (PET-G) Foils and Poly(Ethylene 2,5-Furanoate) (PEF): Preparation and Characterization

Incorporation of a recycled rubber compound from the shoe industry in polystyrene: Effect of SBS compatibilizer content

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