Of course, the use of inorganic fillers to modify the properties of polymers hasbeen around for many years.However, much of the focus on filled-polymers hasbeen on the reinforcing effect, yet it has long been recognized that fracture toughnessis also improved [4,5].Perhaps the lack of attention given to inorganic fillers astoughening agents is due to their poor response to impact situations and the sharpsurfaces generated by an impact event However, the fact remains that the addition ofinorganic spheres, platelets or short fibers can improve the static fracture toughness ofmany polymers
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