Electrical response of functionally graded graphene-nylon segregated composites under quasi-static loading

Kimberly I McCarthy, University of Rhode Island


This research examines the fabrication and electro-mechanical properties of functionally graded graphene-nylon segregated composites. A novel production technique was expanded upon to produce segregated nylon-pellet and graphene nano-composites with low percolation threshold for electrical conductivity. This particle templating procedure effectively disperses graphene within the nylon pellet matrix and is hot-press melted into three-inch diameter discs. While ideally structured for electrical transport, these specimens are mechanically weak along the grain boundaries. To enhance the mechanical properties, a double-rotary shearing step was added to increase mechanical strength without significant sacrifice to electrical properties, signifying the shearing method is a viable trade-off fabrication approach. Lastly, a production technique for fabricating graphene-nylon textiles with conductive properties was investigated. Graphene-coated nylon yarn in a polymer matrix proved to have high electrical conductivity. Chapter one is an introduction to graphene and related studies and applications. The nylon-pellet graphene material fabrication and testing are explored in chapters two and three respectively. Chapter four addresses the nylon-yarn and graphene composites. Electrical conductivity was measured using a high resolution four-point probe method. Three-point bend and tensile testing experiments were used to evaluate mechanical properties.

Subject Area

Mechanical engineering

Recommended Citation

Kimberly I McCarthy, "Electrical response of functionally graded graphene-nylon segregated composites under quasi-static loading" (2016). Dissertations and Master's Theses (Campus Access). Paper AAI10194878.