Thumbnail
Access Restriction
Open

Author Eby Thomas, Thachil ♦ Bindu, Sharmila T. K. ♦ Ajalesh, Nair B. ♦ Beena, Abraham T. ♦ Sabura Begum, P. M.
Source CUSAT-Thesis
Content type Text
Publisher ELSEVIER
File Format PDF
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Chemistry & allied sciences ♦ Technology
Subject Keyword Graphene ♦ Epoxy resin ♦ Nanocomposites
Abstract Graphene has captured the attention of scientific community due to recently emerging high performanceapplications. Hence, studying its reinforcing effects on epoxy resin is a significant step. In this study,microwave exfoliated reduced graphene oxide (MERGO) was prepared from natural graphite for subsequentfabrication of epoxy nanocomposites using triethylenetetramine (TETA) as a curing agent via insitupolymerization. Thermogravimetric analysis (TGA), X-ray diffraction (XRD), Raman spectroscopy,Fourier transform infrared spectroscopy (FTIR), C13 NMR spectroscopy, X-ray photoelectron spectroscopy(XPS) and ultravioletevisible (UVevis) spectroscopy were employed to confirm the simultaneousreduction and exfoliation of graphene oxide. The reinforcing effect of MERGO on epoxy resin wasexplored by investigating its static mechanical properties and dynamic mechanical analysis (DMA) atMERGO loadings of 0 to 0.5 phr. The micro-structure of epoxy/MERGO nanocomposites was investigatedusing scanning electron microscope (SEM), transmission electron microscope (TEM) and XRD techniques.The present work reports an enhancement of 32%, 103% and 85% in tensile, impact and flexural strengthrespectively of epoxy by the addition of even 0.25 phr MERGO. At this loading elastic and flexural modulialso increased by 10% and 65%, respectively. Single-edge-notch three-point-Bending (SEN-TPB) fracturetoughness (KIC) measurements were carried out where a 63% increase was observed by the introductionof 0.25 phr MERGO. The interfacial interactions brought about by graphene also benefited the dynamicmechanical properties to a large extent in the form of a significant enhancement in storage modulus andslightly improved glass transition temperature. Considerable improvements were also detected indielectric properties. The epoxy nanocomposite also attained an ac conductivity of 10 5 S/m and aremarkable increase in dielectric constant. The simple and cost effective way of graphene synthesis forthe fabrication of epoxy/MERGO nanocomposites may be extended to the preparation of other MERGObased polymer nanocomposites. This remarkable class of materials has thrown open enormous opportunitiesfor developing conductive adhesives and in microelectronics
Education Level UG and PG
Learning Resource Type Article