ABSTRACT
Generally, there are large differences between the matrix and filler constituting a composite in such properties as density, elastic modulus, thermal expansion, and surface energy. Desirable properties cannot be obtained merely by more mixing and dispersion of raw material; complete adhesion at the interface is also essential. It is therefore necessary, to improve the surface properties properly in order to increase the affinity between the filler and the matrix to allow them to form a well-integrated material. In this chapter we deal with improvement methods and adhesion properties of inorganic filler surfaces. In general, an inorganic filler tends to have (1) a large specific surface, and (2) as a result, a large surface energy, and (3) a complicated surface structure with structural irregularities. All these properties indicate that the surface of the inorganic filler is active both physically and chemically. The surface characteristics of an inorganic filler depend on the general properties of the solid surface as well as on the intrinsic properties (such as composition and morphology) of the filler.
