Journal
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
Volume 241, Issue -, Pages 82-91Publisher
ELSEVIER
DOI: 10.1016/j.mseb.2019.02.011
Keywords
UHMWPE; Graphene nanoplatelets; Mechanical properties; Thermal properties; Electrical properties
Funding
- Abu Dhabi Education Council (ADEC) [EX2016-000006]
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Here, we report the electrical, mechanical and thermal properties of ultrahigh-molecular-weight polyethylene (UHMWPE) nanocomposites reinforced with 0.1 wt% to 10 wt% of graphene nanoplatelets (GNP). The electrical conductivity of GNP/UHMWPE nanocomposites shows percolation threshold at 30 wt% of GNP. A significant increase in electrical conductivity from 10(-15) S cm(-1) for neat UHMWPE to 10(-5) S cm(-1) at 3.0 wt% GNP loading of GNP/UHMWPE nanocomposite (i.e. 10 orders of magnitude higher) is due to the formation of an almost three-dimensional conductive network. The highest value of electrical conductivity (1.09 S cm(-1)) is observed at 10.0 wt% of GNP loading. The elastic modulus and yield strength increase by 30% and 21%, for the addition of 0.5 wt% and 1.0 wt% of GNP, respectively, while fracture toughness and the ultimate tensile strength decrease significantly above 0.5 wt% GNP loading. This study demonstrates the fabrication of GNP/UHMWPE bio-nanocomposites, which exhibit electrical properties useful for smart biomedical implants.
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