Publication: Properties of conductive fillers filled epoxy composites
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Date
2009-05-01
Authors
Wong, Chiew Hun
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Abstract
This research is aimed to determine the effect of filler loading and types of conductive filler on the properties of epoxy composites. Composite samples were produced by using multi-walled carbon nanotubes (MWCNT), graphite and carbon black in epoxy resin. Fillers loading percentage of 0.5wt%, 1.0wt%, 1.5wt% and 2.0wt% were prepared using mixing and casting technique. Unfilled epoxy was used as a control in this study. Characterizations such as density, electrical conductivity, flexural and thermal expansion analysis were carried out to compare the properties of the composite samples. In general, the density and flexural modulus of the composite increased while the flexural strength and flexural strain decreased with increasing of filler loading. If compare with other fillers, the flexural modulus of graphite filler filled epoxy composite increase dramatically when filler loading is increased. The flexural modulus of graphite filled epoxy composite increasing up to 92.32% compared to unfilled resin. As expected, electrical conductivity of MWCNT filled epoxy composite is the highest if compared to the graphite and carbon black filler filled epoxy composite. The result of the thermal expansion (CTE) test indicated that MWCNT filled epoxy composite has the highest value of CTE and followed by graphite, carbon black and the lowest CTE shown by unfilled epoxy. In general, MWCNT filled epoxy composite shows comparable flexural modulus and strength with other conductive filler composites. Besides that, it also has higher electrical conductivity if compared to those of graphite filler filled epoxy composite and carbon black filler filled epoxy composite.