Effect of oxygen functional groups of reduced graphene oxide on the mechanical and thermal properties of polypropylene nanocomposites

Abstract

Reduced graphene oxide (rGO) with various surface structures was prepared by reducing graphene oxide (GO) with hydrazine hydrate (N 2 H 4 ), sodium borohydride (NaBH 4 ) and L-ascorbic acid, respectively. The resulting rGO were used to fabricate rGO/polypropylene (PP) nanocomposites by a melt-blending method. The surface structure of rGO as well as multifunctional properties of rGO/PP nanocomposites were thoroughly investigated. It was shown that rGO with highest C/O ratio could be obtained by reducing GO with N 2 H 4 . The crystallization behaviors, tensile strength, thermal conductivity and thermal stability of rGO/PP nanocomposites were significantly improved with the increase of C/O ratio of rGO. For example, with only 1 phr (parts per hundred PP) rGO reduced by N 2 H 4 , the degree of crystallinity, tensile strength, maximum heat decomposition temperature and thermal conductivity of PP nanocomposite were increased by 6.2%, 20.5%, 48.0 ∘ C and 54.5%, respectively, compared with those of pure PP. Moreover, the thermal degradation kinetics indicated that the decomposition activation energy of rGO/PP nanocomposites could be enhanced by adding rGO with higher C/O ratio.

Three‐phase interfacial design in BaTiO3/rGO/polyetherimide composite enabling enhanced dielectric, thermal and mechanical properties

“…This enhancement was mainly brought by the inter-molecular frictions between ARGO nanosheets and PEI matrix. 36,37 However, when more ARGO nanosheets were introduced, the extensive agglomeration of ARGO nanosheets hindered the mutual contacts between ARGO and PEI molecular chains and led to a deteriorated thermal stability. After the incorporation of BT nanoparticles, the T d5 and T d10 of 0.6 wt% BT/ARGO/ PEI further increased to 525.31 C and 548.77 C. The intermolecular friction between heterogeneous three phase enhanced the thermal stability of the composite materials.…”

Novel cement slurry containing micro‐encapsulated phase change materials: Characterization, application and mechanism analysis

“…Moreover, it was found that the addition of Micro‐P1 increased the content of ‐OH in cement slurry hydration products. The main reason is that GO has a large number of oxygen‐containing functional groups, thus, the characteristic peak strength of ‐OH was enhanced …”

“…The main reason is that GO has a large number of oxygen-containing functional groups, thus, the characteristic peak strength of -OH was enhanced. 28,29 3.3.3 | X-ray diffraction analysis X-ray diffraction curves of cement slurry samples were presented in Figure 15. As a result, it was found that the positions of characteristic peaks in X-ray diffraction spectra of cement slurry hydration products are basically the same, mainly including Ca(OH) 2 and C-S-H, as well as some mineral components of unhydrated cement.…”

Influence of graphene‐based compounds on the mechanical toughness and thermal stability of polypropylene

“…In our case, graphene does not show functional groups, GO is rich in oxygenated moieties, and RGO shows a certain degree of oxygenated species. Hence, the better interaction of RGO can be related to the decrease of functional moieties as a result of the reduction …”