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

Abstract

Epoxy‐based nanocomposites reinforced with nonfunctionalized porous graphene (NPG), carboxylated porous graphene (CNPG), and amine‐functionalized porous graphene (ANPG) were investigated with regard to mechanical properties, thermal stability, and electrical conductivity. Nanomaterials were added to the epoxy matrix in varying contents of 0.5, 1, and 2 wt %. Generally, mechanical properties were improved as a result of introducing nanomaterials into the epoxy resin. However, the amelioration of toughness was only observed in functionalized NPGs/epoxy nanocomposites. Field emission scanning electron microscopy images showed that functionalized nanomaterials induced a rougher fracture surface compared to the neat epoxy. Dynamic mechanical analysis along with differential scanning calorimetry confirmed an increment in the glass‐transition temperature (Tg) of the reinforced nanocomposites. Also, they proved that functionalization made the epoxy network tougher and more flexible. The electrical conductivity and thermal stability of the epoxy resin were also improved when loaded with nanomaterials. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47475.

A Polyallylamine Anchored Amine‐Rich Laser‐Ablated Graphene Platform for Facile and Highly Selective Electrochemical IgG Biomarker Detection

“…[26,27] It provide anchoring sites for the biomolecule, boosts electron transfer rate, as well as increases stability of LAG. [28,29] Therefore, the substrates lead to better selectivity and sensitivity, as well as lower limit of detection. [30] In this work, a facile electrochemical disposable immunosensing platform has been developed for IgG detection.…”

In situ cross‐linking capability of novel amine‐functionalized graphene with epoxy nanocomposites

“…Among the various approaches to covalent functionalization, the introduction of the amine group on graphene material has greater chances of chemical bond formation with epoxy polymer due to the availability of free lone pairs, which allows to execute substitution reactions on epoxide rings. Many researchers have already adopted the amine functionalization of graphene materials to improve the mechanical, thermal, and electrical properties of epoxy polymer composites 46–52 . The improvement in epoxy polymer composites was associated with improved dispersion and atomistic interfacial interactions 53 .…”

“…Many researchers have already adopted the amine functionalization of graphene materials to improve the mechanical, thermal, and electrical properties of epoxy polymer composites. [46][47][48][49][50][51][52] The improvement in epoxy polymer composites was associated with improved dispersion and atomistic interfacial interactions. 53 Even though high specific work on amine-functionalized graphene, none of the research groups reported the in situ chemical bond formation between amine-functionalized graphene and epoxy polymer.…”

Rheology, dispersion, and cure kinetics of epoxy filled with amine‐ and non‐functionalized reduced graphene oxide for composite manufacturing

“…A number of researchers try to overcome these issues by the use of different solvents such as acetone, 10 isopropanol, 11,12 or N‐methyl‐2‐pyrrolidone, 13 but these come at the cost of environmental issues, additional time‐intensive processing steps and residual impurities that can influence the cross‐linking process and, hence, alter the properties of the matrix significantly 14–16 . In contrast to this, a tailored functionalization of the surface of graphene‐related particles can add functional groups and activate the carbon surface to facilitate a homogeneous dispersion of the particles in the polymer whilst improving the interfacial bonds between the particle and the polymer 17–20 . A well‐dispersed suspension should therefore be regarded as a goal in the production of nanocomposites, but the strong interfacial bonding is also associated with a higher viscosity of the suspension 21 and may also modify the curing reaction 22,23 …”