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Bag material in the fiber surface and the matrix influence chemical reactivity?Among the factors affect the binding properties of the fibers and the resin, when the fiber surface can react chemically functional groups, physical factors that affect the fiber surface structure, shape and size of the surface area may be reduced to secondary status. Such as carbon fiber on the surface oxidation process, there will always be the number of general and specific surface area of ??surface groups while increasing, so these two effects are often mixed together. Mentioned in 1980, the French Institute of Solid Surfaces deliberately carbon fiber in an acid, alkaline medium short-anodized surface group performance and the number to change, without affecting the surface area, the results confirmed that the fiber surface functional groups reactive force on the interfacial bonding It has an important role. In the same experiment, they found that not only affect the number of functional groups interlayer shear strength, but also because of the different nature of the functional groups have different effects. Such as the carbon fiber to generate strong acid groups in the anodic oxidation as cunning group and phenolic groups, will be with the epoxy resin to form a strong interfacial chemical bonding and the emergence of tensile failure mode. Oxide groups while generating a weak acid (e.g. via yl) under the same conditions increases the number of the interface