The Effects of Wet Etching of Glass Fibers and Polyamide Fibers on The Bending and Impact Properties of The Resulting Composite Materials

Abstract

Improving the bonding strength can be achieved by surface treatment of fibers . Etching is one of the methods of this treatment , in this investigation wet etching of E-glass fibers and polyamide fibers carried out by using (H2O + NaOH) solution to get pits on their surface to increase the surface roughness . Group of tests was carried out to study the effect of this treatment on the mechanical (bending and impact) properties of a material composed of unsaturated polyester reinforced by (10 % wt) of etched glass fibers and Etched polyamide fibers . Also Calculation of the weight loss and executing of microscopic photo .The results show :- Increase of the bending strength of etched glass fibers reinforced composite materials with a maximum percentage of (301 %) compared with samples reinforced with untreated fibers . This maximum percentage was found when the fibers are treated at (25 oC) for (1 % NaOH) and (3 hr) .- Increase of the bending strength of etched polyamide fibers reinforced composite materials with a maximum percentage of (155 %) compared with samples reinforced with untreated fibers . This maximum percentage was found when the fibers are treated at (25 oC) for (1.5 % NaOH) and (3 hr) .- Increase of the impact strength of etched glass fibers reinforced composite materials with a maximum percentage of (270 %) compared with samples reinforced with untreated fibers . This maximum percentage was found when the fibers are treated at (25 oC) for (1 % NaOH) and (3 hr) .- Increase of the impact strength of etched polyamide fibers reinforced composite materials with a maximum percentage of (232 %) compared with samples reinforced with untreated fibers . This maximum percentage was found when the fibers are treated at (25 oC) for (0.5 % NaOH) and (5 hr) .- Increase of the weight loss of polyamide fibers than weigth loss of glass fibers .