To enhance the bonding properties between ramie fiber and epoxy resin, the ramie fiber
was modified using nano-silica grafting. Hydrophilic nano-silica treated with water-soluble
sodium dodecyl sulfate (SDS) and organic silane coupling agents was grafted onto the
surface of ramie fiber. The surface roughness of the fibers was considerably increased
after grafting. The nano-silica particles on the fiber surface enhanced the mechanical
and thermal properties of the fiber-epoxy composite plates. Based on an analysis of
contact angle measurements and a water absorption study, it was determined that the
hydrophilicity of the treated fiber was weakened.