Growth of ultra-dense MoS2 nanosheets on carbon fibers to improve the mechanical and tribological properties of polyimide composites

Abstract

To enhance the interface bonding of polyimide (PI)/carbon fiber (CF) composites, CFs were functionalized by introducing a polydopamine (PDA) transition layer, whose active groups provide absorption sites for the growth of molybdenum disulfide (MoS2) nanosheets and improve the bonding strength with PI. Uniform and dense MoS2 nanosheets with thicknesses of 30–40 nm on the surface of the PDA@CF were obtained via a subsequent hydrothermal method. As a result, the interface between the CF and the PI matrix becomes more compact with the help of the PDA transition layer and MoS2 nanosheets. This is beneficial in forming PI/CF-MoS2 composites with better thermal stability, higher tensile strength, and enhanced tribological properties. The lubricating and reinforcing effects of the hybrid CF-MoS2 in the PI composite are discussed in detail. The tensile strength of the PI/CF-MoS2 composite increases by 43%, and the friction coefficient and the wear rate reduce by 57% and 77%, respectively, compared to those of the pure PI. These values are higher than those of the PI/CF composites without MoS2 nanosheets. These results indicate that the CF-MoS2 hybrid material can be used as an additive to improve the mechanical and tribological properties of polymers.

Polydopamine-Assisted Two-Dimensional Molybdenum Disulfide (MoS2)-Modified PES Tight Ultrafiltration Mixed-Matrix Membranes: Enhanced Dye Separation Performance

“…The high-resolution Mo 3d spectra ( Figure 5 b) had three peaks; 229.34 eV and 232.51 eV related to Mo 4+ 3d 5/2 and Mo 4+ 3d 3/2 , while the peak at 235.59 eV may be derived from the surface oxidation of Mo 6+ [ 36 , 39 ]. In the spectra of the high-resolution S 2p ( Figure 5 c), there were peaks at 162 eV and 163.3 eV corresponding to the bivalent S 2p 3/2 and S 2p 1/2 (S 2− ) [ 40 ]. There were two peaks in N1 ( Figure 5 d); the one at 399.9 eV was associated with pyrrolic nitrogen in an indole ring, and the one at 395.3 eV related to the pyridinic resulting from the dopamine functionalization [ 41 , 42 ].…”

Preparation of ultra-high mechanical strength wear-resistant carbon fiber textiles with a PVA/PEG coating

“…Fig. 33 From this, the interaction between PVA and PEG in the composites has an inuence on the crystallinity of PVA/PEG/CFC.…”

MoS2‐Functionalized Graphene Composites—Potential Replacement for Lubricant Friction Modifier and Anti‐Wear Additives

“…Meanwhile, a small S 2s peak is located at a slightly lower binding energy of 226.6 eV. In Figure 7d, the peaks ascribed to the binding energy for S 2p 1/2 and S 2p 3/2 of the divalent sulphide ion (S 2À ) [19] are observed at 163.4 and 162.3 eV, respectively.…”