Thermophysical behaviour of matrix-grafted graphene/poly(ethylene tetrasulphide) nanocomposites

Abstract

A novel approach was used to fabricate poly(ethylene tetrasulphide) (PETS)-modified graphene nanosheets.Accordingly, graphene oxide (GO) was modified with (3-chloropropyl)triethoxysilane (CPTES) to yield GO-Cl with the ability of participation in interfacial polymerization of 1,2-dichloromethane (EDC) and disodium tetrasulphide (Na 2 S 4 ) and synthesis of graphene/PETS nanocomposites. Also, to investigate the effect of surface chemistry of the nanosheets on the properties of the nanocomposites, GO-Cl nanosheets were reduced by hydrazine monohydrate to obtain rGO-Cl. The success of modification and reduction of the nanosheets was confirmed by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), X-ray powder diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Then, two series of nanocomposites containing different contents of GO-Cl and rGO-Cl were synthesized. Proton nuclear magnetic resonance ( 1 H NMR) was used to determine the molecular weights of the polymers. Also, dispersion of the nanosheets in the polymeric matrix was studied by XRD and thermal stability and the thermophysical properties of the nanocomposites were investigated by TGA and differential scanning calorimetry (DSC) respectively.Results showed that incorporation of the nanosheets leads to lower molecular weights of the polymeric matrix whereas reduced nanosheets were dispersed more appropriately in the matrix. According to the TGA results, the dispersion of nanosheets and molecular weight of the matrix were prominent factors in the thermal stability of the nanocomposites. Also, all samples showed a glass transition temperature (T g ) less than 0 C, a cold crystallization temperature (T cc ), and a subsequent melting point (T m ) which were affected by the content of nanosheets.

Chlorine-doped reduced graphene oxide nanosheets as an efficient and stable electrode for supercapacitor in acidic medium

“…1 shows FT-IR spectra of RGO and Cl-RGO samples. The characteristic difference between non-chlorinated and chlorinated sample is the presence of C-Cl bond at 1182 cm -1 and 876 [24,28]. The FT-IR spectra of these samples indicate weak peaks centered at around 3445, 1625 and 1088 cm -1 , which can be related to the vibrations of O-H, C=O and C-OH functional groups, respectively [29].…”

Investigation of the mechanical, thermal, and anticorrosion properties of epoxy nanocomposite coatings: Effect of synthetic hardener and nanoporous graphene

“…Generally, porous graphene contains either random or highly regular holes. This spongy structure of NPG leads to a high surface area, a hydrophobic nature, and a low cost of manufacturing …”

Incorporation of epoxy resin and graphene nanolayers into silica xerogel network: an insight into thermal improvement of resin

“…8a, G shows higher thermal stability and its char content reaches to 90.5 % at 700°C. Maximum mass loss for GO was observed in 150-220°C, because the most of labile oxygen-containing groups at the surface or edge of GO decomposed and formed CO and CO 2 steams [61,62]. Thermal decomposition of oxygen-containing groups with higher thermal stabilities was observed at temperatures between 230 and 700°C [63].…”