dc.contributor.advisor | Naraghi, Mohammad | |
dc.creator | Hong, Seokjin | |
dc.date.accessioned | 2016-04-06T16:31:57Z | |
dc.date.available | 2016-04-06T16:31:57Z | |
dc.date.created | 2015-12 | |
dc.date.issued | 2015-12-09 | |
dc.date.submitted | December 2015 | |
dc.identifier.uri | https://hdl.handle.net/1969.1/156234 | |
dc.description.abstract | Interfacial properties in carbon fiber composites is one of the key parameters controlling their structural functionality. Here, we introduce a novel method to engineering carbon fiber-epoxy interfaces, via inclusion of nanofibers, towards higher interfacial strength and energy dissipation. In our method, thermally stabilized polyacrylonitrile (PAN) nanofibers are grafted onto carbon fibers via electro-spinning process, followed by nanofiber consolidation via solvent vapor and thermal treatment. These treatments partially dissolve nanofibers along the nanofiber-fiber interface and trigger entropic elasticity in nanofibers thus, increasing the nanofiber-fiber interactions. The hybridization of carbon fibers with PAN nanofibers increased the interfacial shear strength (IFSS) by ~48%, from 10.8 ±2.6 to 15.9 ±4.9 MPa. Postmortem fractography points to mechanical interlocking between nanofibers and epoxy and reinforcing effects of nanofibers in matrix as root causes of IFSS enhancement. As a result of adding nanofibers to carbon fiber, junction failure mode changes from a dominantly adhesive failure (at epoxy-fiber interface) to dominantly cohesive failure, and failure plane slightly shifts away from epoxy-fiber interface to within the epoxy. Compared to other types of whiskers grown on carbon fibers, such as CNTs, the method proposed here requires low temperatures (below 300°C), during which no surface damages are expected to accumulate on carbon fibers. | en |
dc.format.mimetype | application/pdf | |
dc.language.iso | en | |
dc.subject | Interfacial shear strength | en |
dc.subject | interfacial adhesion | en |
dc.subject | fiber-matrix interaction | en |
dc.subject | hybrid carbon fiber | en |
dc.subject | and fiber-reinforced composites | en |
dc.title | Controlling the Wettability and Adhesion of Carbon Fibers with Polymer Interfaces via Grafted Nanofibers | en |
dc.type | Thesis | en |
thesis.degree.department | Materials Science and Engineering | en |
thesis.degree.discipline | Materials Science and Engineering | en |
thesis.degree.grantor | Texas A & M University | en |
thesis.degree.name | Master of Science | en |
thesis.degree.level | Masters | en |
dc.contributor.committeeMember | Talreja, Ramesh | |
dc.contributor.committeeMember | Creasy, Terry | |
dc.type.material | text | en |
dc.date.updated | 2016-04-06T16:31:57Z | |
local.etdauthor.orcid | 0000-0002-7463-4124 | |