Interfacial Engineering of Graphene Nanosheets at MgO Particles for Thermal Conductivity Enhancement of Polymer Composites

Abstract

An important task in facilitating the development of thermally conducting graphene/polymer nanocomposites is to suppress the intrinsically strong intersheet π-π stacking of graphene, and thereby to improve the exfoliation and dispersion of graphene in the matrix. Here, a pre-programmed intercalation approach to realize the in situ growth of graphene nanosheets at the inorganic template is demonstrated. Specifically, microsized MgO granules with controlled geometrical size were synthesized using a precipitation method, allowing the simultaneous realization of high surface activity. In the presence of a carbon and nitrogen source, the MgO granules were ready to induce the formation of graphene nanosheets (G@MgO), which allowed for the creation of tenacious linkages between graphene and template. More importantly, the incorporation of G@MgO into polymer composites largely pushed up the thermal conductivity, climbing from 0.39 W/m∙K for pristine polyethylene to 8.64 W/m∙K for polyethylene/G@MgO (60/40). This was accompanied by the simultaneous promotion of mechanical properties (tensile strength of around 30 MPa until 40 wt % addition of G@MgO), in contrast to the noteworthy decline of tensile strength for MgO-filled composites with over 20 wt.% fillers.

Three-dimensional numerical simulation of thermal conductivity of aluminium powder/TNT fusion-cast explosives

“…He, G [2] quantitatively demonstrated that pGNPs@Ag reduces the ITR, which contributes to the improving of the composite k. Lin C et al [3] doped nano-TATB particles into PBX to construct a novel self-reinforced PBX, which significantly improved the strength and toughness. Pan L et al [4] established a constitutive relationship between graphene microstructure and thermal conductivity of PBX. Pietrak, K considered the case where interfacial thermal resistance is present in the heat transfer model [5].…”

Synthesis and characterization of biodegradable poly(ester‐imide) nanocomposites with L‐alanine, curcumin, and modified rGO

“…To enhance interfacial inter‐linkage with the polymer matrix, GO sheets are chemically modified with functionalization agents 15–18 . Some studies have shown that antibacterial effects of GO/rGO are detected at concentrations higher than 4 g/mL, which is considered the maximum concentration that is not cytotoxic 19,20 . Since in the preparation of nanocomposites, the desired properties can be achieved at a low percentage of reinforcement, the graphene‐based nanocomposites show low toxicity.…”

“…[15][16][17][18] Some studies have shown that antibacterial effects of GO/rGO are detected at concentrations higher than 4 g/mL, which is considered the maximum concentration that is not cytotoxic. 19,20 Since in the preparation of nanocomposites, the desired properties can be achieved at a low percentage of reinforcement, the graphene-based nanocomposites show low toxicity. This study will use bio-based diol, L-Alanine, and curcumin to synthesize a biodegradable poly(ester-imide) (PEI) with excellent mechanical and thermal properties.…”

High mechanical strength and low ablation rate of phenolic resin composites incorporated with polyhedral oligomeric silsesquioxane‐modified graphene oxide

“…15,16 Therefore, it is important to improve the compatibility between GO and the matrix. For example, silane coupling agents 10,17 and inorganic nanoparticles 18 have been used to enhance the GO dispersion and compatibility in the polymer matrix. It was reported that a graphene nanoplatelet covalently functionalized 3-aminopropyltriethoxysilane/boron phenolic resin composite (K-Gnp/BPR) was prepared.…”