Nucleation of Impact Modified Filled Polypropylene

Abstract

Nucleation of polypropylene is important in determining its mechanical properties. Nucleation in polypropylene is nearly always found to be heterogeneous. Control is best achieved by addition of a nucleant. Addition of a filler can provide nucleation, as well as enhancing stiffness. Formation of blends with other polymers can change nucleation depending on the partition of the nucleant between polypropylene and the other polymer, and the nucleant activity of the interface with the other polymer. Other crystalline forms can be obtained, depending on the crystallisation conditions and additives. For instance alpha and beta forms, and transcrystallinity occur. This paper reviews the interplay of these variables on polypropylene morphology and properties.