PENGARUH KADAR DAN WAKTU PERENDAMAN KALIUM PERMANGANAT PADA KOMPOSIT FIBER BAMBU BETUNG EPOKSI DAN METODE HAND LAY UP

A composite is defined as a material consisting of two or more components that have different properties or structures that are physically mixed together to produce a new material that has superior properties to the material that forms it. In this research, epoxy resin was used as the matrix and betung bamboo fiber as reinforcement. Which aims to improve the interface properties of the composite. Treatment of betung bamboo fiber using KMnO4 solution. With variations in KMnO4 solution levels of 3%, 5%, and 7% and variations in soaking time of 15 minutes and 30 minutes. Fabrication was carried out using the hand lay Up method with a silicone rubber mold and then tensile testing was carried out to determine the tensile strength of the composite and digital microscope observation to see the fracture pattern of the composite that had been subjected to tensile testing. The results of the research show that the highest tensile strength value for variations in KMnO4 levels and variations in soaking time is found at 5% KMnO4 content with a soaking time of 30 minutes, namely 41.21 MPa, the highest strain value is found at 5% KMnO4 content with a soaking time of 30 minutes, namely 3.07%, the highest elastic modulus value at 7% KMnO4 content with a soaking time of 15 minutes is 1333.44 MPa. There is a fiber pullout fracture pattern, namely the bond between the fiber and the matrix is not strong and debonding, namely the release of the fiber from the matrix which causes holes to form in the specimen without treatment, and there is an overload fracture pattern, namely the fiber breaking which is caused by the strength limit of the fiber and the strong bond between the fibers. and matrix in specimens treated with KMnO4.

Keywords: Composite, Betung bamboo, KMnO4, Epoxy resin, Tensile properties