Mechanical properties of composite board based on coconut coir and terminalia catappa fruit fibers with Polyvinyl Acetate (PVAc) Matrix

Abstract

The synthesis of composite board made from a mixture of coconut coir and Terminalia catappa fruit fibers using Polyvinyl Acetate (PVAc) matrix has been successfully carried out. The synthesis aims to determine the effect of a mixture of coconut coir and Terminalia catappa fruit fibers with PVAc matrix on the mechanical properties of the composite board. The samples were made with variations in the composition of the volume fraction of coir fiber and Terminalia catappa fruit fibers, namely (30:70), (40:60), (50:50), (60:40), and (70:30)%. The ratio of the volume fraction of the mixture of natural fibers and the PVAc) matrix made was (70:30)%. The sample production begins with taking the coconut coir and Terminalia catappa fruit, drying and cutting, then mixing the coconut coir and Terminalia catappa fruit fibers with a PVAc matrix, printing the composite with printing tools and drying. The finished sample was then mechanically tested using the UTM tool AnD, model R3010. The results showed that the value of the maximum tensile stress and the modulus of elasticity increased with the increase in the concentration of coir fibers used. The value added in length and strain decreased with the decrease in the concentration of coco fiber used. Overall, the composite sample has met the SNI 03-02105-2006 criteria where the maximum tensile stress value ranges from 8.21 MPa to 18.81 MPa and the modulus of elasticity ranges from 829.71 MPa to 1620.67 MPa.