Properties of Recycled High Density Polyethylene and Coffee Dregs Composites
Cestari, Sibele Piedade; Mendes, Luis C.; Silva, Daniela França da; Chimanowsky Junior, Jorge Pereira; Altstädt, Volker; Demchuk, Vitaly; Lang, Anneliese; Leonhardt, Rodrigo Gheno; Keller, Jan-Hendrik
http://dx.doi.org/10.4322/polimeros.2014.011
Polímeros: Ciência e Tecnologia, vol.23, n6, p.733-737, 2013
Resumo
Composites of recycled high density polyethylene (HDPE-R) and coffee dregs (COFD) were elaborated. The blends were made at the proportions of 100-0, 90-10, 80-20, 70-30, 60-40, 50-50 and 40-60% polymer-filler ratio. The materials were evaluated through scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermogravimetry/derivative thermogravimetry (TGA), and compressive resistance test. The compounding was done using a two-stage co-kneader system extruder, and then cylindrical specimens were injection molded. All composites had a fine dispersion of the COFD into the polymeric matrix. The composites degraded in two steps. The first one was in a temperature lower than the neat HDPE, but higher than the average processing temperature of the polymer. The melting temperature and the degree of crystallinity of the composites resulted similar to the neat HDPE ones. The compressive moduli of the composites resulted similar to the neat polymer one. The results show that these composites have interesting properties as a building material.
Palavras-chave
Composites, mechanical properties, thermal properties, recycling, HDPE
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