Mechanical properties such as elastic modulus

hardness and creep behavior of CB/PP composites filled with carbon black were studied by nanoindentation. The results shows that due to the strengthening effect of carbon black particles on CB/PP composites

elastic modulus and hardness of the composite increased with the increase of CB content. The creep stress index and creep characteristic relaxation time of pure PP and CB/PP composites were obtained

the results show that the increased content of CB not only increases the creep stress index of the composite but also improves the hardness and fatigue resistance. At the same time

with the increasing of CB

the creep characteristic relaxation time of the composite decreases

which indicate that the CB particles effectively hinder the movement of the polymer molecular chain.