Ziegler-Natta isotactic polypropylene (iPP) was melt mixed with four different nucleating agents (carbonnanotubes (CNT) ,carbon nanofibers (CNF), lithiumbenzoate (LiBe), andasorbitolderivative (Millad)) in order to study the ireffecton the crystallization of iPP.It was found that the four different nucleating agents promote the alpha crystalline form. At 0.01wt%, thecarbon nanoparticles produced the higher crystallization temperature“