“…Multiple crazes, which are initiated and terminated by the added rubber particles, are commonly accepted as the toughening mechanism of HIPS [11][12][13]. However, inorganic particles such as silica, montmorillonite and CNTs, which have been shown to have positive effects on the tensile properties, including modulus and elongation-at-break, have insignificant influence on the impact toughness of PS [14][15][16]. Good dispersion of fillers, especially nano-sized particles in a polymer matrix, is an important prerequisite to high impact toughness.…”