Date of Award
Master of Science (MS)
Mechanical Engineering and Applied Mechanics
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 nanocomposites 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 polymer 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.
McCarthy, Kimberly I., "Electrical Response of Functionally Graded Graphene-Nylon Segregated Composites Under Quasi-Static Loading" (2016). Open Access Master's Theses. Paper 940.
Available for download on Thursday, November 23, 2017