Effect of modified sizing agent on mechanical properties of carbon fiber reinforced epoxy resin matrix composites
A wet spun carbon fiber subjected to surface treatment with modified epoxy resin sizing agents was produced into prepregs by hot melt method,which were produced into carbon fiber reinforced resin matrix composites by hot press molding process.The chemical structure and thermal stability of the modified sizing agent were analyzed.And the effects of the modified sizing agent on the basic properties of carbon fiber,the splitting rates of the fiber bundle,the micro-morphology of the fiber/resin interface and the mechanical properties of the composite material were studied.The results showed that the modified sizing agent had a thermal decomposition temperature of 284.3℃with an elevation of 9.3℃,due to the introduction of active groups indica-ting that the thermal stability was improved as compared with that of the unmodified sizing agent;the carbon fiber bundles treated with the modified sizing agent showed the splitting rates of 70%and better splitting properties with an increase of 7.7%in the splitting rate;the carbon fibers treated with the unmodified and modified sizing agents were comparable in the basic properties,but the carbon fiber treated with the modified sizing agent had slightly higher tensile strength;and the carbon fiber reinforced res-in matrix composites prepared by modified sizing agents were superior in the overall mechanical properties,with a 17.8%in-crease in 0 ° tensile strength,regular tensile cross-section,and no obvious fiber pull-out or delamination between the fiber layer and the resin layer.
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