Ecologic particleboard based on HDPE/EVA blend reinforced with corncob fiber and zinc oxide nanopaticle treated by electron-beam radiation
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2016
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MEETING OF IONIZING RADIATION AND POLYMERS SYMPOSIUM, 12th
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Agricultural residues such as sugarcane bagasse, soy husk, rice husk, cornstalks, and corncob represent a potentially valuable source of fiber that could be used as a reinforcement in polymer for several applications. Corncob a sub products of corn agroindustry is generated in large quantities in Brazil. The traditional use of this residue in Brazil includes bedding for animals and livestock feeding. However, a large amount of corn sub products is unutilized, is burning or left in the field. An alternative use for corncob would be to produce particleboard panels in association with a polymer material. Thereby, this composite can be a cheap alternative to construction and a possible way to decrease the amount of waste from landfill. The objective of this work is to study the potential use of corncob as fiber reinforcements for thermoplastics as an alternative to wood fibers. In this work, HDPE/EVA blend reinforced with corncob fiber (20 wt. %) and zinc oxide nanoparticles (1 wt. %) was prepared by melt-mixing processing, using a twin screw extruder machine, with 16 mm and L/D = 25 rate. The temperature profile was 160/ 160/ 165/ 170/ 175/ 180 ºC. Screw speed was 60 rpm. The extrudates were cooled down for a better dimensional stability, pelletized, dried again at 60 ± 2 ºC for 4 h and fed into injection molding machine and specimens test samples were obtained. Part of samples were irradiated at 100 and 200 kGy using an electron beam accelerator, at room temperature in presence of air. The irradiated and non-irradiated samples were characterized by mechanical tests, XRD, TG, DSC, FE-SEM analysis and the correlation between properties was discussed. In addition, the sol–gel analysis were carried out in the non-irradiated and irradiated samples in order to evaluate the degree of cross-linking in the HDPE/EVA blend as a result of electron-beam irradiation. The non-irradiated HDPE/EVA blend dissolved completely in the xylene. On the other hand, the irradiated HDPE/EVA lost only small part of its original weight dissolved in the organic solvent. Consequently, these results indicate that a large part of the material was cross-linked and insoluble in hot xylene. The mechanical test results of the irradiated samples showed superior mechanical performance than non-irradiated sample and better interface adhesion between corncob fiber and polymer matrix. These results confirm that the addition of corncob fiber and zinc oxide nanoparticle improved the original characteristics of HDPE/EVA blend and led to the obtaining of ecologic particleboard and interior design for application in home construction for low-income people.
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LAINETTI, FABIANA; OLIVEIRA, RENE R.; RODRIGUES, RITA C.L.B.; MOURA, ESPERIDIANA A.B. Ecologic particleboard based on HDPE/EVA blend reinforced with corncob fiber and zinc oxide nanopaticle treated by electron-beam radiation. In: MEETING OF IONIZING RADIATION AND POLYMERS SYMPOSIUM, 12th, September 25-30, 2016, Peninsula of Giens, France. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/27225. Acesso em: 18 Apr 2024.
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