The impact fracture surface of sulphur-cured blend left a lot of crevices which contributes to absorb impact energy.
As for the phenolic resincured blend, it shows an impact fracture surface without apparent plastic deformation,
which is similar to its cryo-fracture surface as shown in Fig. 4d, showing low impact strength of only 6.75 kJ/m2.
The above morphologies of the impact fracture surface were consistent ell with the impact strength shown in Fig. 2a