Toward effective and tunable interphases in graphene oxide/epoxy composites by grafting different chain lengths of polyetheramine onto graphene oxide

Silane bonded graphene aerogels with tunable functionality and reversible compressibility

“…Raw GO flakes with lateral dimensions of 1-10 µm were produced by using a modified Hummers method via oxidation of natural graphite [44][45][46]. The silane-b-RGO aerogels were fabricated by silane-assisted co-assembly method at a low and fixed GO concentration of 1.0 mg mL -1 in water.…”

Enhancement in Mechanical, Thermal, and Dielectric Properties of Functionalized Graphene Oxide Reinforced Epoxy Composites

“…This restricts their higher potential application in the polymer nanocomposites. 15,16 Furthermore, functionalized graphene oxide (F-GO) using modification agents with reactive groups can be chemically bonded with polymer chains via in situ polymerization, facilitating dispersion and increasing interaction between polymer matrix and functionalized graphene oxide for high performance applications. [17][18][19] Among the various methods, the frequently used one is the surface modification of graphene oxide to functionalization graphene oxide using silane coupling agents in which there is covalent bonding between graphene with the polymer matrix which result in enhancement in properties.…”

Targeted kinetic strategy for improving the thermal conductivity of epoxy composite containing percolating multi-layer graphene oxide chains

“…The small peak centered at 2" = 43.3° usually remains in graphite oxide [27] or MGO sheets [17]). Notably, after dispersed in matrix, WXRD patterns of all the studied MGO/epoxy composites except 3 wt% MGO loading only show a broad diffraction peak derived form the amorphous epoxy (centered at 2" = 18.5°); the small peak disappears, which indicates a complete disorder in the direction perpendicular to GO layers, corresponding to an exfoliation of MGO by intercalation in epoxy matrix [18,[26][27][28]. Subsequently, the small diffraction peak of MGO appears (see the red circle), verifying that MGO restacks or is partially exfoliated in epoxy matrix at the 3 wt% loading.…”

“…Further improving the thermal conductivity by increasing MGO content (> 2 wt%) is impossible to realize since a dramatically increased viscosity had already been noticed as preparing the 2 wt% MGO/epoxy composite with big agglomerates and trapped air bubbles impossible to be cleared in the case of higher MGO loading (see the agglomerates and through-holes emerging in the insets). The level of exfoliation and dispersion of MGO play crucial roles in determining the ultimate performance of composites since restacking of MGO sheets significantly reduces their effectiveness for forming conductive network [21,26]. XRD is an important tool for analyzing the exfoliation level of MGO in composites [26].…”

“…The level of exfoliation and dispersion of MGO play crucial roles in determining the ultimate performance of composites since restacking of MGO sheets significantly reduces their effectiveness for forming conductive network [21,26]. XRD is an important tool for analyzing the exfoliation level of MGO in composites [26]. As shown in Figure 3a, WXRD pattern of graphite particles exhibits a sharp characteristic peak centered at 2" = 26.6° and a small one centered at 2" = 43.3°, which are assigned to the diffraction of (002) and (100) planes of well-ordered graphenes, respectively [27].…”