α- and β-polypropylenes: The effects of processing on final properties

Abstract

The study directs attention towards different effects of mould temperature and holding pressure on the tensile properties of injection-moulded neat and β-nucleated polypropylenes. A commercial-grade of polypropylene was modified with a β-nucleator. From both the original and β-nucleated materials, tensile test specimens were injection-moulded. Stress-strain measurements performed at room temperature revealed that the effects on the tensile characteristics of both materials are more pronounced within mould temperature changes, compared with those of holding pressure.