Reduced silanized graphene oxide/epoxy-polyurethane composites with enhanced thermal and mechanical properties

Incorporation of epoxy resin and carbon nanotube into silica/siloxane network for improving thermal properties

“…Appearance of amorphous peak indicates that carbon nanotubes are coated by silica/siloxane moieties [59,60]. Chemical modification and polymerization were caused by partial reduction in CNTCOOH [61]. XRD patterns for composites with 0.5 % loading show a characteristic wide peak, which is assigned to amorphous nature of epoxy resin [40].…”

Modification of graphene with silica nanoparticles for use in hybrid network formation from epoxy, novolac, and epoxidized novolac resins by sol-gel method: Investigation of thermal properties

“…In the oxidation process, size of sp 2 -hybridized domains was decreased and oxygen-containing groups were created at the surface and edge of layers [55,56]. A broader diffraction pattern of GO, FGO, and SFGO in comparison with the original graphite originates from destruction of graphitic layers during the oxidation and grafting of HDBTMSPU at the surface of GO and SiO 2 at the surface of FGO [57]. Silane-functionalization and attachment of SiO 2 prevents from restacking of the graphene layers [58].…”

“…Silane-functionalization and attachment of SiO 2 prevents from restacking of the graphene layers [58]. These broad peaks are located at diffraction angles of near to the graphite diffraction peak, which may be due to partial reduction of GO by grafting reactions [57]. In the case of SGEH2, amorphous nature of hybrid structures composed of graphene, epoxy resin, and silica/siloxane network results in a broad diffraction peak in the region of 12-30°.…”

Effect of Thermo-oxidation on the Mechanical Performance of Polymer Based Composites for High Temperature Applications

“…The (BiO) 2 CO 3 ·xH 2 O nanoplates combines several flame-retardant strategies including the char formation, dilution effect of CO 2 and water, and physical barrier effect, and thus enhanced the thermal stability, flame retardancy and smoke suppression of PMMA/(BiO) 2 CO 3 ·xH 2 O composites simultaneously [26]. Synthesis of reduced silanized graphene oxide/epoxy-polyurethane (EPUAs/R-Si-GEO) composites with enhanced thermal and mechanical properties was reported by Lin et al [27]. Graphene oxide (GEO) prepared from natural graphite flakes was modified with methacryloxypropyltrimethoxysilane to prepare silanized GEO (Si-GEO), and was then reduced by NaHSO 3 to prepare RSi-GEO (partially reduced Si-GEO).…”

“…EPUAs/R-Si-GEO was obtained by curing reaction between EPAc/R-Si-GEO and an isocyanate curing agent. Thermal gravimetric analysis (TGA), tensile strength, elongation at break, and cross-linking density measurements showed that the thermal stability and mechanical properties of EPUAs/R-Si-GEO were greatly enhanced by the addition of R-Si-GEO [27].…”