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Mechanical and electrical properties of mined coal filled polyethylene and polyamide

Rojek M., Stabik J.

Archives of Materials Science and Engineering

2009

Vol. 36, nr 1

34-40

Purpose: The purpose of the present paper is to present results of basic mechanical properties research of high-density polyethylene and polyamide 6 filled with two kinds of mined coal particles. Because composites with carbon are expected to poses low electric resistance also surface resistivity was measured. Design/methodology/approach: Dependences of tensile strength, elongation at break, impact strength, ball hardness and surface resistivity on volume content of mined coal in polymeric matrix are measured and discussed. Findings: Introduction of mined coal fine particles to polyethylene did not cause significant changes in tensile strength, while the same property of polyamide composites decreased significantly. Brinell ball hardness of all polyethylene and polyamide composites increased almost proportionally to coal content. Pronounced lowering of deformability (elongation at break) with increasing coal content was observed for all formulations. Also impact strength significantly decreased after mined coal filling. Significant lowering of surface resistivity was noticed especially for coal-polyamide composites. Research limitations/implications: Obtained results showed that mined coal fine particles can be applied as a filler of thermoplastic polymers but poor adhesion between polymer matrix and filler particles was achieved. Additional research on mined coal fine particles modification by coupling agents is needed to develop better adhesion. Practical implications: Obtained results showed that mined coal fine particles can be applied as a filler of thermoplastic polymers but poor adhesion between polymer matrix and filler particles was achieved. Additional research on mined coal fine particles modification by coupling agents is needed to develop better adhesion. Originality/value: Polymer composites with carbon as a modifier has been used for many years but there have been only a few experiments on introducing fine particles of mined coal into thermoplastics.

Polimery termoplastyczne napełnione węglem kamiennym

Rojek M., Stabik J.

Zeszyty Naukowe. Chemia i Technologia Chemiczna / Akademia Techniczno-Rolnicza w Bydgoszczy

2006

z. 11

119-122

W artykule omówiono możliwości wykorzystania węgla kamiennego jako napełniacza polietylenu i poliamidu. Przedstawiono wyniki badań mechanicznych i oporności powierzchniowej polietylenu i poliamidu, napełnionych dwoma rodzajami węgla kamiennego. Uzyskane wyniki wskazują, że wpływ węgla kamiennego na właściwości mechaniczne polietylenu i poliamidu jest podobny do oddziaływania napełniaczy mineralnych. Wprowadzenie węgla kamiennego do polietylenu po-woduje korzystne, znaczne zmniejszenie oporności powierzchniowej.

The paper discusses possibilities of application of mined coal with different carbonization degree as a filler of polyethylene and polyamide. Mechanical properties and surface resistivity of polyethylene and polyamide filled with two different mined coals are presented. Achieved results indicate that influence of introduction of mined coal into polyethylene and polyamide is similar to the influence of mineral fillers. Additionally mined coal causes essential surface resistivity decrease of polyethylene.