Abstract: In order to explore the effect of the four different blend ratios of kenaf/kevlar on the mechanical properties of blended fabric reinforced composites, the mechanical properties of composites reinforced by epoxy resin matrix, fine processing kenaf and aramid woven fabrics of different blending ratios were tested, and the morphology and polarity of kenaf fibre were examined by SEM and FTIR. The results show that kenaf/aramid 30/70 reinforced composites have the maximum flexural strength of 248.81MPa, and improved by 4.9%, flexura modulus of 12.91GPa, and improved 7.1%, compared with pure kevlar fabric reinforced composites. The maximum shear strength of kenaf/aramid 20/80 reinforced composites are 24.58MPa, increased by 18.6%. SEM and FTIR results indicate that the kenaf fiber became fine after treatment, fiber surface roughness was increased and the polarity became lower, which improves the interfacial bonding strength of the fabric with a resin, and improves the flexural and shear properties of aramid composites.

Key words: kenaf, para-aramid, different blend ratios, composites, mechanical properties, surface roughness, polar