Abstract
The work presents a comprehensive profile of the physicochemical characteristics of opoka sedimentary rock in the context of its use as a hybrid filler for thermoplastics. Determining the functional parameters of the studied filler was the main aim of this research. Thermal treatment leads to changes in its morphology and phase composition. A wide range of physicochemical techniques was used, such as low-temperature nitrogen adsorption, FT-IR, TGA, XRD, optical, and electron microscopy. The susceptibility of the material to micronisation was also tested (ball milling). Due to its widespread occurrence, opoka can be an attractive alternative to fillers such as silica or chalk. In order to verify this statement, polypropylene composites thereof were prepared by melt blending and injection molding, and studied by mechanical testing and microscopic imaging.
Highlights
Inorganic mineral fillers can be divided into two groups: natural and synthetic ones (Figure 1)
This study presents a comprehensive physicochemical characteristics of the carbonate-silicate opoka rock and its influence on the mechanical properties of PP composites
The composition of the raw material after calcination at 1000 ◦ C declared by the manufacturer contents CaO (43.33%), SiO2 (36.05%) as the mains compounds with Al2 O3, TiO2, MgO, and MnO addition
Summary
Inorganic mineral fillers can be divided into two groups: natural and synthetic ones (Figure 1). Mineral fillers are successfully used as modifiers of polymer materials properties, more and more often being a good alternative to synthetic fibers such as: carbon fibers [2], aramide or nylon fibers [3], or glass fibers [4]. They reduce the cost of the final product, and improve parameters such as: mechanical strength [5], thermal stability and flame resistance [6], as well as dielectric properties. Mineral fillers for thermoplastics often include natural sedimentary rocks, like calcium carbonate [11], mica, clinoptilolite [12], zeolites [13], kaolin [14], silica [15], titanium dioxide [16]
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