Research on polyamide matrix composites filled with hard coal

Purpose: The aim of this paper is to present the summary results of studies on polyamide composites filled with hard coal. Research on the use of coal as a filler of polymers are conducted for many years in Division of Metallic and Polymeric Materials Processing, Silesian University of Technology. This paper summarizes results obtained in different research programmes preformed in recent years. Described materials are polyamide 6 composites filled with modified and unmodified hard coal powder.Design/methodology/approach: All the resulting compositions intended for research have been produced using twin screw extruder. The resulting mixtures of various compositions were then subjected to a process of granulation. The prepared composites have undergone a process of injection moulding which allowed to obtain samples for strength tests. Full statement of research results obtained for composites could help to predict the material with the best mechanical properties and hence the best material for construction.Findings: It has appeared from studies that in both a composite made of unmodified coal and of coal modified with coupling agents show a decrease in mechanical properties in comparison with the neat polymer. Apart from this these composites are interesting materials because of low prize of the filler.Research limitations/implications: It can be concluded from research that all types of obtained composites are characterized by a decrease in mechanical properties.Practical implications: Applications of hard coal as a filler of polymer composites is way to produce new materials. It is worth noting that the main features of the filler used is its prevalence, low cost and electrical conductance.Originality/value: The results describe new fillers of thermoplastic polymers and the possibility of its modification.