The effects of flexible epoxy surface treatment on tensile strength of biocomposites were shown in Fig.
4. The tensile strength of treated bamboo fiber and coconut fiber reinforced PLA composites were higher
than the untreated composites. The improvement in tensile strength was believed to be due to the better
interfacial adhesion with the flexible epoxy treatment. However, it can be seen that the effects of flexible
epoxy on tensile strength of vetiver grass fiber/PLA combination was different when compared with other
natural fibers. The flexible epoxy treated vetiver grass fiber reinforced PLA composite showed less
improvement in tensile strength compared with bamboo fiber and coconut fiber.