Properties of recycled high density polyethylene and coffee dregs composites

Cestari, Sibele Piedade; Mendes, Luís Claudio; Silva, Daniela França da; Chimanowsky, Jorge P.; Altstädt, Volker; Demchuk, V. A.; Lang, Anneliese; Leonhardt, R.; Keller, Jan-Hendrik

doi:10.4322/polimeros.2014.011

Cited by 13 publications

(7 citation statements)

References 10 publications

(11 reference statements)

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“…The materials used were recycled HDPE (rHDPE), in the shape of pellets, having a density of 0.973, and melt flow rate (MFR) of 2.589˘0.209 g¨10 min´1, donated by the COMBRARE recycler (Manufacturer, City, Country); the sugarcane bagasse (SCB) was donated by HC Sucroquímica sugarcane plant (Campos dos Goytacazes, Rio de Janeiro, Brazil). The latter was used without any previous chemical treatment and then grinded and sifted using a sieve with 32 mesh, according to the ASTM C136 [20]. The SCB micro fibre that passed through the sieve was used in the composites.…”

Section: Methodsmentioning

confidence: 99%

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Upcycling Polymers and Natural Fibers Waste—Properties of a Potential Building Material

et al. 2016

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Composites of recycled high-density polyethylene and micro fibres of sugarcane bagasse were studied, in order to create an upcycled material to produce masonry bricks. We ranged the polymer/filler ratio from 100-0 to 60%-40%. The materials were assessed through scanning electron microscopy, thermogravimetry/derivative thermogravimetry, differential scanning calorimetry, rheological measurements and compressive strength test. The composites showed a good dispersion and adhesion of the filler into the polymeric matrix. There was no significant variation on the melting and crystallizing temperatures of the materials if compared to those of neat polymer, indicating that there was no relevant change in the average size of the polymeric crystals. We assumed that some transcrystallization has happened, because the degree of crystallinity of the composites increased to all filler contents, while the crystallizing temperature remained the same. There was a rise in the compressive moduli of the composites, ranging from 37% to 63%. The modulus at the crossover point and the complex viscosity also rose due to the fibres ratio. The results show that the combination of these materials led to the reinforcement of the compressive strength of the polymer, and have interesting properties as a potential building material.

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Section: Methodsmentioning

confidence: 99%

“…By that time, we noticed the high compressive resistance of those composites. Later, we developed another material using a different fibre (which resulted in inert filler) [18][19][20]. From this point of view arose the idea of using recycled HDPE (rHDPE) and SCB to create a reinforced material for the construction industry.…”

Section: Introductionmentioning

confidence: 99%

Upcycling Polymers and Natural Fibers Waste—Properties of a Potential Building Material

et al. 2016

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“…In recent years, there have only been a handful of published studies in this area. These have mostly focused on SCG biocomposites with polymers including poly(lactic acid) (Baek et al 2013;Lee et al 2015a;Wu 2015), polypropylene (Jaya Chitra et al 2014;García-García et al 2015), recycled high-density polyethylene (Cestari et al 2013), and poly(vinyl alcohol) (Lee et al 2015b). After extensive research, only one publication on CC composites, with feather keratin polymer, was found (Barone 2009).…”

Section: Introductionmentioning

confidence: 99%

Characterization of Wastes and Coproducts from the Coffee Industry for Composite Material Production

et al. 2016

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This study characterizes and compares coffee chaff (CC) and spent coffee grounds (SCG), the two most useful coffee waste products, and evaluates their performance as fillers and/or reinforcing agents in polymer composites. The morphologies of the CC and the SCG were studied using a scanning electron microscope (SEM). Detailed compositional and elemental analyses of the samples were carried out using several techniques. The thermal stabilities of the two types of biomass were evaluated using thermogravimetric analysis (TGA). Infrared spectroscopy was performed to investigate the functional groups available on the surface of the biomass. It was found that the CC had higher thermal stability, lower fat content, and a denser fibrous structure than the SCG, making it potentially a more suitable material than the SCG for use as a reinforcing filler in polymer composites. To verify this potential, CC and SCG filled polypropylene composites were produced and evaluated.

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“…The composite with 30 wt.% of SCG had the same compressive modulus as the neat polymer. However, the composites with 40 and 50 wt.% fillers had 11% lower compressive moduli, while at a 60 wt.%, the loss was 29% [ 114 ].…”

Section: Scg Polymer Compositesmentioning

confidence: 99%

Valorization of Spent Coffee Grounds as Precursors for Biopolymers and Composite Production

et al. 2022

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Spent coffee grounds (SCG) are a current subject in many works since coffee is the second most consumed beverage worldwide; however, coffee generates a high amount of waste (SCG) and can cause environmental problems if not discarded properly. Therefore, several studies on SCG valorization have been published, highlighting its waste as a valuable resource for different applications, such as biofuel, energy, biopolymer precursors, and composite production. This review provides an overview of the works using SCG as biopolymer precursors and for polymer composite production. SCG are rich in carbohydrates, lipids, proteins, and minerals. In particular, carbohydrates (polysaccharides) can be extracted and fermented to synthesize lactic acid, succinic acid, or polyhydroxyalkanoate (PHA). On the other hand, it is possible to extract the coffee oil and to synthesize PHA from lipids. Moreover, SCG have been successfully used as a filler for composite production using different polymer matrices. The results show the reasonable mechanical, thermal, and rheological properties of SCG to support their applications, from food packaging to the automotive industry.

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Properties of recycled high density polyethylene and coffee dregs composites

Cited by 13 publications

References 10 publications

Upcycling Polymers and Natural Fibers Waste—Properties of a Potential Building Material

Upcycling Polymers and Natural Fibers Waste—Properties of a Potential Building Material

Characterization of Wastes and Coproducts from the Coffee Industry for Composite Material Production

Valorization of Spent Coffee Grounds as Precursors for Biopolymers and Composite Production

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