4. Conclusion
The fiber content, interfacial modification, and manufacturing process have significant effects on the tensile, impact and creep properties of sisal fiber reinforced HDPE composites. As the fiber content increases, the tensile strength, tensile modulus, and
creep-resistance of the composites increases. Interfacial adhesion between the sisal fibers and the PE matrix is significantly improved by modification by maleic anhydride grafted HDPE (MAPE), which results in the improved mechanical properties of the composites. The composites fabricated through pre-impregnation have better
mechanical properties than those processed through simultaneous blending. In addition, the General Power-Law equation fits the creep curve of the composites very well, and the identified parameters can be used to accurately predict creep-recovery behavior of
the composites.