Chemical and mechanical properties analysis of extruded polyvinyl choloride (PVC)/sepiolite composite

Mustafa Özgür Öteyaka, Hasan Candan Öteyaka
2019 Sakarya University Journal of Science  
In this study, poly vinyl chloride (PVC)/ sepiolite composites were produced using an extruder. Two different sepiolite powders: white and gray were added to the PVC in order; 5 wt.%, 10 wt.%, 15 wt.% and 20 wt.%. The morphology alteration, chemical behavior and mechanical properties of the powders and the composites were examined by X-ray fluorescence (XRF), tensile test, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and ultimate
more » ... EM) and ultimate tensile strength (UTS). The results showed that the sepiolite white powder had 20.72 wt.% CaO and approximately half of the 20.81 wt.% SiO2 as compared to the sepiolite gray powder. The XRD analysis confirmed that the structure of calcined white sepiolite contained dolomite, while gray calcined-sepiolite contained zeolite. The composites with 5 wt.% sepiolite white or gray powders exhibited higher tensile strength. Increasing the quantity of both sepiolite powders in the composites deteriorated the surface with cracks and shifted the thermal degradation of the sepiolite gray toward higher temperatures. The mineral filler plays a major role in the plastic composite industry, because it extends and improves the mechanical properties and cost of composites [7] [8] [9] [10] [11] [12] . For example, the processing, dimensional stability, mechanical strength and thermal resistance of composites can be improved by the addition of clay mineral filler (montmorillonite, saponite, sepiolite, etc.). The characteristics of composite are dependent on the shape, particle and aggregate size, quantity and dispersion of the filler [13] [14] [15] [16] [17] . Various studies attempted to improve the strength and toughness of PVC by addition of CaCO3 powders [18] [19] [20] , but the mechanical properties were in fact lower than
doi:10.16984/saufenbilder.464841 fatcat:6egx33wtfzes7b6bmfvznddbki