Simultaneous reduction and surface functionalization of graphene oxide for enhancing flame retardancy and thermal conductivity of mesogenic epoxy composites

Abstract

Graphene oxide (GO) is reduced and surface functionalized by 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide simultaneously. This functional reduced graphene oxide (F‐rGO) with better thermal stability can be used as a nano‐filler to improve the flame retardancy, mechanical properties and thermal conductivity of mesogenic epoxy (EO). Due to the presence of an oriented structure, EO is an intrinsic highly thermal conductive polymer compared with common polymer. After being filled with F‐rGO, the ordered domains in the EO matrix are connected by F‐rGO. As a result, the thermal conductivity coefficient of F‐rGO/EO composite is increased by 30.8% compared with pure EO. The dynamic mechanical analysis results indicate that E' of F‐rGO/EO is 26.7% higher than that of EO. Because of the stable structure of F‐rGO, F‐rGO/EO is self‐extinguishing. The total heat release of F‐rGO/EO‐15 is 24.1 kJ g−1, which is 5.6 kJ g−1 lower than that of EO. © 2016 Society of Chemical Industry

Interface engineering for the improvement of mechanical and thermal properties of covalent functionalized graphene/epoxy composites

“…The incorporation of well surface tuned TZG remarkably improved the fracture toughness property. The K IC value of pure epoxy was found to be ∼1.2 MPa m 1/2 , which is similar to the prior published reports for epoxy composites . Interestingly, the K IC value for the composite containing 0.1 wt % of TZG loading is improved by 111% as compared to pure epoxy.…”

“…Among different studied polymer composites, epoxy‐based composites have been widely explored due to the excellent properties associated with its highly crosslinked microstructure. Epoxy resins, one of the structural polymers are known for their good mechanical and thermal properties, high adhesive strength and electrical insulation, low shrinkage, chemical and corrosion resistance . However, severe brittleness and poor resistance to crack propagation has narrow down the applicability of epoxy‐based materials for various fields.…”

Microwave responsive epoxy nanocomposites reinforced by carbon nanomaterials of different dimensions

“…The absorbed electromagnetic energy would be dissipated by heat, which is then diffused into surrounding resin, leading to a rapid temperature rising of the whole FGSs/ESMP composite. The heat diffusion would be quick due to the large BET surface area of FGSs (385.7 m 2 /g) and the intimate interface adhesion between FGSs and ESMP [see Figure (g)], which can greatly decrease the heat diffusion resistance …”

Hydroxyl-decorated ammonium polyphosphate as flame retardant reinforcing agent in solvent-free two-component polyurethane

“…Specifically, other than the bands of graphite‐like structures positioned at 1628 cm −1 , four new absorptions at around 1382 cm −1 (PO stretching), 1088 and 1049 cm −1 (POP and POC in phosphate–carbon complexes) and 883 cm −1 (crosslinked PNC structures) can be clearly discerned even at 500 °C for PU/OH‐APP15, while these peaks are not perceptible in the spectra of PU. Generally, the plentiful PNC and POP structures can facilitate the formation of heat‐resistant carbonaceous residue, which prevents the underlying material from further degradation during fire, and hence resulting in better flame retardation …”