Crystallization of isotactic polypropylene containing beta-phase nucleating agent at rapid cooling

► The polymorphism of iPP containing β-phase nucleating agent was investigated. ► Emphasis has been placed on rapid cooling conditions/high supercooling. ► Fast scanning chip calorimetry and X-ray scattering have been employed. ► The β-phase nucleating agent is only effective on rather slow cooling/low supercooling.