Study by thermal methods of some physical-mechanical properties of polypropylene (PP) used for high performance sport products [articol]

Abstract

This paper presents the influence of processing temperature on some mechanical-physical properties of polypropylene (PP) used for injection moulding of performance sport products. The test pieces were moulded at the following real injection temperatures : 220°C, 240°C, 260°C, 280°C and 300°C. It was determined that the in-mould (cavity) pressure decreased with increasing of the processing temperature. Also PP was thermally analyzed through : Thermogravimetry (TG), Differential Scanning Calorimetry (DSC) and Dynamic-Mechanical Analysis (DMA). It was established that processing temperature has a minor influence on the thermal stability, the glass transition temperature and melting point of polymer, but the storage modulus (E’) is significantly influenced by the processing temperature.