Abstract: Abstract: Polyhedral Oligomeric Silsesquioxane (O-POSS) with n-octyl was synthesized in this paper. The O-POSS/iPP nanocomposite was prepared. The rheology, crystallization behavior and mechanical properties were investigated. The results show that O-POSS can obviously improve the rheology behavior of iPP and the O-POSS/iPP nanocomposite is pseudoplastic fluid. The O-POSS can increase crystalline degree and melting point of iPP. When the amount of O-POSS is between 4% and 6%, composite has the best mechanical properties.

Key words: polypropylene, silsesquioxane, rheological behavior, mechanical property, crystal property