Fig. 5(a) and (b) show SEM images of fracture surface of the 3 and 5 wt. % MAPP incorporated composites
filled with 50 wt. % wood flour. SEM image showed that there are no clear gap between wood flour and PP
matrix, indicating the good interface bonding. The fracture surface of the composite showed a very limited
amount of torn matrix, suggesting that the matrix is more brittle than those composites without MAPP.