Abstract
The aim of the study was to determine the effect of the application of processing screws with a modified test segment in a corotating twin-screw extruder on selected properties of talc-filled polypropylene extrudate. The test segment was built of trilobe kneading elements and its design modifications refered to changing the distance between the kneading elements and the angle of positions of kneading elements that are relative to each other. The performed tests included the production of extrudate with various degrees of talc-filling using five design solutions of the test segment and then measurements of selected properties, such as tensile strength, elongation at maximum tensile stress, and melt flow rate. Structural studies using scanning electron microscope (SEM) and differential scanning calorimetry (DSC) were also carried out. The study includes not only the description of experimental results but also the determination of empirical models describing the dependence of the properties of the obtained extrudate on the conditions of the extrusion process and the design features of the test segment.
Highlights
Polypropylene is one of the most commonly used polymer materials, thanks to its properties such as good stiffness, high melting point, chemical resistance, easy processability and very good mechanical strength to density ratio [1,2,3,4]
Conclusions affects the degree of crystallinity of polypropylene—the greater the fineness, the higher the degree of Corotating is a complex process depending on a number of according different crystallinity
Corotating twin-screw extrusion is a complex process depending on a number of different to Corotating twin-screw extrusion is afactors
Summary
Polypropylene is one of the most commonly used polymer materials, thanks to its properties such as good stiffness, high melting point, chemical resistance, easy processability and very good mechanical strength to density ratio [1,2,3,4]. The available literature includes numerous papers on composites based on polypropylene matrix, reinforced with solid particles, fibres, organic materials and layered inorganic fillers Their introduction is aimed at improving the functional properties and obtaining the desired stiffness, thermal resistance, mechanical properties, corrosion resistance or gas permeability and reducing the manufacturing costs [4,7,11]
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