Diffusion of various liquids to tubular shaped fiber reinforced composites


In present work tubular –shaped fiber reinforced composites weremanufactured by using two types of resins ( Epoxy and unsaturated polyester) andseparately reinforced with glass, carbon and kevlar-49 fibers (filament and wovenroving), hybrid reinforcement composites of these fibers were also prepared. Thefibers were wet wound on a mandrel using a purposely designed winding machine,developed by modifying an ordinary lathe, in winding angle of 55° for filament.Various liquids were allowed to diffuse into the composite samples, where allcomposite samples were immersed in water, HCl (0.5N, IN) and NaOH (0.5N, 1N).The exhibited behaviors were mainly explained in accordance to Fick’s –law.However, there were few case of anomalous behavior observed.The observed difference in diffusion rate for acidic and basic solutionsmay be explained in terms of different permeability of OH- and H+ ions in thecomposite samples. This permeability was also found to be affected by thedebonding process which might be initiated by the liquid penetration. Diffusioncoefficients were also deduced and their relatively higher values are indicative forsome damage mechanism taking place in the composite and not the pure matrix.UP composite exhibited higher values than EP composite which suggest that higherdamage has taken place in UP-composite.