Figures 8.5 and 8.6 represent the SEM images of untreated and treated fibers. A clear rougher surface with channels is visualized from treated IDL fiber (Fig. 8.7). These void channels help in filling of matrix and thereby bonding among treated fiber and matrix.

The benzoylation treatment on sisal fiber resulted in decrease in diameter, and alkali-soluble fractions like waxy layer and lignin were removed from the fiber (Manikandan Nair et al. 1996). It was further noticed that the benzoylation treatment gives rise to many fine holes on the fiber surface which will enhance mechanical bond between the fiber and matrix.