Enhancement in Mechanical, Thermal, and Dielectric Properties of Functionalized Graphene Oxide Reinforced Epoxy Composites

Abstract

ABSTRACT:The present work has the objective of fabricating graphene oxide (GO) and amine-functionalized graphene oxide (F-GO) reinforced epoxy composites using the casting method. Epoxy resin was dispersed separately with GO (0.5 wt%) and F-GO (0.5 and 1 wt%), and then the epoxy resin mixture cured with triethylenetetraamine at room temperature. The synthesized GO and F-GO were characterized by FT-IR and Raman spectroscopy. The interfacial interaction of Si in the composite was studied by XPS. The formation of GO and F-GO was confirmed by XRD. The tensile and flexural strength composites were measured using the UTM. The thermal behavior and dynamic mechanical behavior were examined by TGA and DMA. The surface morphology and dielectrical properties were analyzed by SEM, TEM, and impedance analyses. The results obtained from epoxy/F-GO (0.5 wt%) composite revealed higher mechanical and thermal properties than neat epoxy and epoxy/GO composites.

Reinforcing effect of amine‐functionalized and carboxylated porous graphene on toughness, thermal stability, and electrical conductivity of epoxy‐based nanocomposites

“…According to Table , toughness and elongation are increased to a greater extent in CNPG‐reinforced nanocomposites than those in NPG‐loaded nanocomposites at each content. This could be due to the chemical reactions of carboxylic groups with epoxies, simultaneously inducing a better interaction of functional groups with epoxy bonds and an interference in the curing process of epoxy resin; it interestingly culminated in the toughness enhancement of the nanocomposites …”

“…Incorporation of nanomaterials into polymer composites has drawn tremendous attention as an efficient and cost‐effective method for improving properties in the past few decades . In addition, as there is a growing demand in industry for polymeric nanocomposites, particularly epoxy‐based ones, due to their potential applications, reinforcing their properties has become an essential issue .…”

“…In addition, as there is a growing demand in industry for polymeric nanocomposites, particularly epoxy‐based ones, due to their potential applications, reinforcing their properties has become an essential issue . Epoxy resin, known as the most prevalent thermoset polymer, presents excellent engineering properties in terms of chemical stability, adhesive strength, and corrosion resistance, but it suffers from severe drawbacks such as inherent brittleness and poor toughness, which are originated in epoxy's highly crosslinked microstructure . To overcome these weaknesses, epoxy nanocomposites are introduced; it is vital to consider that an improvement in the mentioned defects does not usually disimprove other properties …”

“…Carbon‐based nanomaterials, including carbon nanotubes (CNTs), carbon nanohorns, and carbon nanocones/disks; and graphene and its derivations, such as graphene nanoplatelets (GNPs), porous graphene (NPG's), and graphene oxide (GO), are highly consumed as a means to modify the mechanical properties and toughness of epoxy‐based nanocomposites . Among nanocarbon materials, graphene, an atomic‐scale material with two‐dimensional (2D) honeycomb lattice and high‐specific surface area, has gained greater heed due to its magnificent properties.…”

“…In a study, Suresh Kumar and Subramanian investigated the effect of GO and amine‐functionalized graphene oxide (F‐GO) on properties of epoxy nanocomposites . It was observed that applying small amounts of nanomaterials into epoxy resin in general enhanced tensile strength and thermal and dielectric properties in comparison to those of the neat composite.…”