Study of the influence of the treatment and the content of coconut and sisal fibers on the thermal properties of natural fiber/ epoxy prepregs
Keywords:
Prepregs; Natural fiber/epoxy; Factorial planning; Thermal Analysis.Abstract
Prepregs are typically used in the automotive and aerospace industry with the combination of synthetic fibers and partially cured epoxy resin. In this innovative study, however, natural fibers such as coconut fiber and sisal will be used as reinforcement in the epoxy. The laminated prepregs can be stacked for the manufacture of laminated composites, which after curing can have excellent mechanical characteristic. However, the thermal stability and degree of cure for these materials depend on the several factors, such as type, treatment, and fiber content. Thus, in this study, the Experimental Factorial Planning (EFP) method was proposed to define the best conditions to the manufacture of natural fiber/epoxy prepregs. Statistic planning has the objective to determine the significant relationships of the variables in a process and to define the best methodology to obtain a material. The prepregs selected after the planning were then characterized by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The samples were prepared at room temperature and analyzed after 5 days of storage. The data were calculated by using a statistical software. In addition, the effects were interpreted in two ways: geometric and graphic. For both such as interpretations, the prepregs behave in a similar way, where the materials made with mercerized fibers have their thermal properties improved since the thermal stability temperature has been increased and the ideal degree of cure has been obtained. Both fibers are relevant. Regarding the fiber content, there is a significant effect only on the thermal stability.
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