Effects of Electrochemical Oxidation of Carbon Fiber on the Chemical Structure of Fiber Surface

Abstract

Sincethecarbonfibersurfaceisinert,thefibersurfacemustbeactivatedtointeractwiththepolymersizings.Oxygenfunctionalgroupscanbeintroducedintothefibersurfacethroughelectrochemicaltreatment.Distributionofoxygenfunctionalgroupsandthemechanicalpropertiesofcarbonfibervarydependingonthesurfacetreatmentconditions(electrolyteconcentration,currentdensity,residencetime).Thesechangesaffecttheinterfacialadhesionbetweenthecarbonfiberandthepolymersizingagent.Becauseexcessivesurfacetreatmentleadstodegradationofmechanicalproperties,ammoniumbicarbonateisusedastheelectrolyteformildtreatmentconditions in this experiment . Researchontheeffectofchangesofcarbonfibersurfacestructureontheinterfacialadhesionstrengthbetweenfibersandpolymersizingcancontributetotheimprovementofcarboncompositemechanicalproperties. For the high-performance carbon fibers manufacturing process, the correlation between the current density and the chemical microstructure of the carbon fiber surface was analyzed using tensile tests and Raman spectroscopy and scanning electron microscopy.