Abstract
This paper reports the preparation of Kevlar-Nomex copolymer nano-composites with exfoliated pristine and functionalized graphene sheets (Grs). The graphene oxide (GrO) platelets were amidized by the reaction of amine-terminated aramid (Ar) with the functional groups present on the GrO surface to prepare the nano-composites films with different loadings of GrO. Chemical changes involved during the oxidation and subsequent amidation were monitored by Raman, FTIR and XP spectroscopic analyses. Morphology of the composite films was studied by atomic force and scanning electron microscopies. Viscoelastic properties of the hybrid films were studied for their glass transition temperature (Tg) and storage modulus by dynamical mechanical thermal analysis (DMTA). A higher shift in glass transition temperature was obtained by chemically binding the aramid copolymer chains on the functionalized Gr sheets. The increase in tensile strength and modulus at various loadings of GrO are compared with the composites using pristine Gr. The effect of interfacial interactions between the matrix chains and the reinforcement on the properties of these hybrids have been explained.
Highlights
High polymers, because of their relatively low density, cost, ease in processability and high chemical resistance, are considered an important class of materials used in modern technology, but as structural materials, they have limitations due to their low modulus, mechanical strength and low operating temperatures
Fourier Transform Infrared (FTIR) analysis on the pristine graphene sheets (Grs) and graphene oxide (GrO) was performed to Fourier Transform Infrared (FTIR) analysis on the pristine Gr and GrO was performed to confirm the possible structural differences in the samples and these spectra are given in the Figure 1
The even more cloudy or diffused distribution over for an improvement in mechanical properties, we find that most of the GrO sheets are well impregnated the entire surface of matrix the composite is evident in These the case of the Aramid Graphene Oxide (ArGrO)
Summary
Because of their relatively low density, cost, ease in processability and high chemical resistance, are considered an important class of materials used in modern technology, but as structural materials, they have limitations due to their low modulus, mechanical strength and low operating temperatures. A promising filler to replace CNTs for polymer composites is graphene (Gr), which has a two dimensional sp2 -hybridized carbon platelet structure These sheets, with one-atom thickness, have gained importance over the last two decades [15,16,17,18]. The interaction of GrO with the polymer matrix leading to exfoliation of the nano-sheets have been found to improve significantly the physical, mechanical, thermal, electrical and electronic properties of the matrix materials. Viscosity increase accompanying the polymerization process, can hinder the dispersion in this method, whereas re-stacking of graphene sheets can significantly reduce the effectiveness of the filler. These properties are related with the composition and different types of possible interactions, i.e., physical or chemical, between the Gr sheets and the aramid matrix
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