Abstract: A three-compartment rectangular flow cell was used for studying the cyclic voltammograms of several vinyl monomers in aqueous solutions. The best potential for electropolymerization was clotermined. Electropoly merizations were conduct,d using batch cell and continuous apparatus稵he appearance and the thickness of electropolymerization coatings were examined using scanning electron microscopy. The tensile strength, tensile modulus and elong ation at break of filament from these coated fibers were examined. The impact and interlaminar shear strength of composites from these coated fibers and an epoxy resin were examined. The composites showed simultaneous improvement in impact and interlaminar shear strength obviously.