Introduction: Graphene is flat monolayer of carbon atoms (one atom thick), covalently
bonded to three other atoms in tightly packed two-dimensional (2D) hexagonal single layer stable
crystalline honeycomb lattice structure. In this paper, In-situ amine functionalized exfoliated graphene
with multiple layers (3-6) with low defect contents and average aspect ratio upto 10 microns
(average X and Y dimensions) and thickness upto 2-3 nm (average Z-direction) which have been
produced with the combined effort of chemical vapor deposition (CVD) and chemical graphite exfoliation
Methods: This paper also focuses on the effect of the reinforcement of amine functionalized multiple
graphene layers (AF-MGL) on the mechanical and visco-elastic properties of epoxy composites. AFMGL/
epoxy composites (AF-MGL/EpC) were prepared with graphene fractions ranging from 0.5 to
2.0 wt%. The four different samples were prepared using an amount of graphene as 0.0, 0.5, 1.5, and
2.0. A series of tensile three point bend tests were performed on the different AFMGL/epoxy composites.
Optical and scanning electron microscopy (SEM) was used to examine the micro structural
features and fractured surfaces of AF-MGL/EpC.
Results: Increased graphene content results in improved tensile strength and the modulus of an epoxy
matrix when compared with the pure epoxy matrix. The 1.5 wt% AF-MGL/EpC showed an increase
in tensile strength and modulus by 50.2 and 52.8% respectively. However, a shrink was noticed
beyond 1.5 wt.% samples of AF-MGL/EpC composite. Moreover, an improvement of 28.8% in
the storage modulus was also recorded when compared with epoxy composites.
Conclusion: The effect of the amine functional group on the mechanical and viscoelastic properties
was also explored using molecular dynamics (MD) simulations and predicted results were then compared
with experimental results.