Scanning electron microscopy (SEM) was used to
determine the silica dispersion in the NR matrix. Fig. 10
provides the SEM micrographs of the tensile fractured
surfaces of the silica-filled NR vulcanisates with and
without the addition of ALK: (A) A/0.0; (B) C/3.0; (C) D/5.0;
and (D) E/7.0 at 300 magnification