Measurement of dielectric properties of polymer matrix composites developed from cow bone powder
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This research was focused on determining the dielectric properties of composite materials developed from carbonized and uncarbonized agrowaste (cow bone) material. The uncarbonized materials were washed, air dried, and part of the materials were carbonized at a temperature of 750 °C after which they were milled into powder and sieved into sieve grades of 150, 300, and 600 μm. The cow bone particles were varied from 40 to 60 wt%. A mineralogical analysis carried out by the X-ray diffractometer revealed that the carbonized and uncarbonized bone particles contain the following elements: O, Na, Mg, Al, Si, Ca, and C. Surface morphology of the carbonized and uncarbonized particles as revealed by the SEM confirmed the particles to be regular and solid in nature. The TGA/DTA analysis shows that the carbonized particles were more thermally stable than the uncarbonized particles were. The dielectric strength, dielectric constant, and water absorption capacity were determined. The effect of carbonization on the abovementioned properties was studied and used as criteria for the evaluation of the composites. The results shows that smaller particles and weight percentage have the best properties: example at the 40 wt% of 150 μm, the dielectric strength for the CCB and UCB are 217.96 and 510.84 Kv/mm, respectively. The same trend was observed in all the compositions and all the particle sizes. Better enhancement of property was obtained for the composites with lower wt% and smaller particle sizes compared to the higher wt% and bigger particle-sized composites. The significant factors (main and interaction) were identified by analysis of variance technique. The Cube and 3D graphs show the estimated response surface for the composite properties as a function of sample condition, wt%, and particle size. It is also evident from the results that the actual experimental values are in close proximity with the predicted values.
KeywordsDielectric Carbonization Composites Agrowaste Cow bone
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