Examination of the dynamic mechanical properties of polypropylene composites reinforced glass fibre
* Renata Sobczak, * Zygmunt Nitkiewicz, ** Józef Koszkul * Politechnika Częstochowska, Instytut Inżynierii Materiałowej, ul. Dąbrowskiego 69, 42-200 Częstochowa ** Politechnika Częstochowska, Katedra Przetwórstwa Tworzyw Sztucznych i Zarządzania Produkcją, al. Armii Krajowej 19c, 42-200 Częstochowa
Annals 2 No. 3, 2002 pages 78-80
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abstract The effect of glass fibre content on dynamical properties of polypropylene composites has been examined. Within the confines of the work the annealing influence on the properties has also been determined. Polypropylene and its composites filled with 30 and 50% of glass fibre have been tested. The investigation of dynamical properties of composites matrix has been made in order to compare. Dynamic mechanical tests were conducted in three-point bending mode by a dynamic mechanical thermal analyser (DMA 242 by Netzsch) under the following conditions: specimens dimension: 50x10x4 mm, temperature interval: 0 to 130oC, heating rate 2oC/min at frequency 10 Hz. Figure 1 shows the storage modulus (E′) and loss modulus coefficient (tgδ) measured by DMA at 10 Hz as a function of temperature for polypropylene and its composites. The glass transition the most evident for polypropylene (Fig. 1a). In case of polypropylene composites range of glass transition is less evident, in particular for composite polypropylene with 50% glass fibre content. The biggest tendency decreasing of storage modulus as a function of temperature was noted for polypropylene (Fig. 1a) and the least for composite polypropylene with 50% glass fibre content (Fig. 1c). It was found, that increase in of glass fibre content in the composites decrease value of tgδ. The influence of heat-treatment (annealing) shows the bigger values of the storage modulus E′.