Alpha- AND Beta-POLYPROPYLENES: THE EFFECTS OF PROCESSING ON FINAL PROPERTIES

摘要

The study directs attention towards different effects of mould temperature and holding pressure on the tensile properties of injection-moulded neat and beta-nucleated ploypropylenes. A commercial-grade of polypropylene was modified with a beta-nucleator. From both the original and beta- 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.