Experimental Investigation of Mechanical, Viscoelastic, and Dielectric behavior in Blended Hybrid Epoxy Composites Made with Coffee Bean Filler
J. Environ. Nanotechnol., Volume 13, No 4 (2024) pp. 56-62
Abstract
The study aims to understand the interplay between fillers and epoxy matrix in hybrid composite materials. The impact of coffee bean powder on the dielectric, tensile, flexural, impact, and dynamic properties of epoxy resin containing Vachellia nilotica (VN) is investigated in this work. The hand layup method was used to create the composite samples, which included various volume fractions of coffee beans (3, 6, 9, 12, and 15 v/v%) as a particulate filler. The VN content was maintained at a constant concentration of 15 v/v%. Additionally, experiments were conducted to ascertain the mechanical, viscoelastic, and dielectric characteristics of the hybrid composites. The findings clearly show that among the varying volume fractions, the one containing 9 v/v% coffee bean has substantially superior mechanical and dielectric properties. Additionally, it was observed that the epoxy composite with a filler percentage of 9 v/v% had better glass transition temperature and storage modulus. The TGA test revealed that the addition of coffee beans to the VN hybrid increased the composite’s thermal strength. Further, the dielectric test findings demonstrated that the coffee bean filler increased the resin’s dielectric strength. The tensile fracture of the composite was analyzed using scanning electron microscopy through assessing structural morphology.
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Reference
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