30.  Influence of Processing Temperature on Some Mechanical-Physical Properties of Thermoplastic Polyurethane Desmopan KA 8377 Used for Injection Moulding of Performance Sport Products

Authors: G.R.E. Maries, G. Bandur, G. Rusu


Abstract:

This paper presents the influence of processing temperature on some mechanical-physical properties of thermoplastic polyurethane (TPU), grade Desmopan KA 8377, used for injection moulding of performance sport products. The test pieces were moulded at the following real injection temperatures : 200C, 210C, 220C, 230C and 240C. It was determined that the in-mould (cavity) pressure decreased with increasing of the processing temperature. Also TPU was thermally analyzed through: Thermogravimetry (TG), Differential Scanning Calorimetry (DSC) and Dynamic- Mechanical Analysis (DMA). It was established that processing temperature has a significant influence on the thermal stability and on the glass transition temperature of polymer while the flow temperature is slightly influenced by the processing temperature.


Keywords: thermoplastic polyurethane (TPU), injection moulding, Thermogravimetry (TG), Differential Scanning Calorimetry (DSC) , Dynamic-Mechanical Analysis (DMA)

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