Polycarbonate/molybdenum disulfide/carbon black composites: Physicomechanical, thermal, wear, and morphological properties

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Abstract
To investigate the influence of molybdenum disulfide (MoS2) as solid lubricant and filler on the polycarbonate (PC) and carbon black (CB) composites, PC containing one weight percentage of CB powder was compounded and extruded with 0.5, 1.0, 2.0, and 3.0 weight percentage of MoS2 powder in a co‐rotating twin screw extruder. Thus, the fabricated PC/CB/MoS2 composites were characterized for physicomechanical properties such as density, void content, surface hardness, tensile behaviors, and impact strength. The thermal characteristics of the composites have been studied by differential scanning calorimetry and dynamic mechanical analysis (DMA). The effect of MoS2 content, loads and sliding distances on wear characteristics of the composites were evaluated using pin‐on‐disc equipment. It was found that wear, friction, and laser etching resistance of PC/CB/MoS2 composites increased with increase in MoS2 content along with improvement in tensile and impact strengths. DMA analysis indicates the storage modulus of PC/CB/MoS2 composites increased with increase in MoS2 content below the glass transition temperature (Tg) of PC. Worn surfaces and laser etched surfaces were examined with scanning electron microscopy and optical microcopy respectively to have better insight of the wear and laser etching mechanism. It was observed that the MoS2 as solid lubricant played major role in improving resistance to wear, friction, and laser etching. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers

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