Three‐dimensional structured MXene/SiO₂ for improving the interfacial properties of composites by self‐assembly strategy

Abstract

An unprecedented electrostatic self-assembly of MXene and SiO 2 on carbon fiber (CF) to enhance the interfacial properties of CF-reinforced epoxy resin composites is disclosed. MXene with negative charge was anchored on the cationized CF surface via a strong electrostatic interaction, followed by synergistic effect of amine-modified SiO 2 (positive charge) to furnish a stable MXene/SiO 2 material with three-dimensional structure, which takes the advantages of high modulus, large specific surface area, and high-surface activity. The involvement of the two nano-materials with different dimensions and morphologies results in synergistic enhancement on mechanical interlocking, leading to excellent chemical bonding connection between CF and resin, which could transfer stress and dissipate energy effectively. Moreover, the surface energy of CF increased from 26.67 to 48.12 mJ/m 2 after assembly of MXene/SiO 2 . Compared with unsized CF/EP composites, the interfacial shear strength, interlaminar shear strength, and flexural strength of CF/MXene/SiO 2 /epoxy (EP) composites were increased by 73.2%, 61.2%, and 39.2%, respectively. Dynamic mechanical analysis poxy (DMA) tests showed that the storage modulus of the CF/MXene/SiO 2 /EP composites was enhanced by 64% compared with CF/EP composites, and the glass-transition temperature of composites was elevated from 147.9 to 151.8 C. This protocol provides a promising strategy for designing advanced CF/EP composites with threedimensional structure.

Synchronously improved thermal conductivity and mechanical property for polybenzimidazole composites by building the ternary hybrid nanofillers networks

“…In recent years, two-dimensional transition metal carbides (MXenes) have been recognized as a remarkably effective nanofiller for enhancement of the TC and electromagnetic interference (EMI) shielding behaviors inherent in TC 472 WÁm À1 K À1 , large aspect ratio and adjustable surface functional groups. [31][32][33] Liu et al [34] prepared Ti 3 C 2 T x /PVA composites having both considerable thermal stability and conductivity and found significant improvement of the stability of Ti 3 C 2 T x against heat due to the PVA chains as a consequence of reduced thermal coefficient of the Eg 1 mode from À0.06271 to À0.03357 cm À1 K À1 . In respect of Ti 3 C 2 T x /PVA composite materials, the TC could arrive at 47.6 WÁm À1 K À1 .…”

Constructing “Soft‐Stiff” Structure on the Surface of Carbon Fiber to Enhance the Interfacial Properties of Its Epoxy Composites

“…The peaks at 3400 cm −1 and 2950–2820 cm −1 were assigned to the OH and CH stretching vibration, separately. [ 25 ] For CF‐MnO 2 , the characteristic peak at 525 cm −1 was related to the stretching vibration of MnO. [ 16 ] The peaks at 1640 and 1550 cm –1 were assigned to the CO stretching vibration and the NH bending vibration of CS, respectively.…”

Recent Advances in MXene/Epoxy Composites: Trends and Prospects

“…Recent works have introduced additional components to the ER-MXene-CF system. In the work of Ao et al, MXene layers were electrostatically deposited in CF previously cationized with polyethyleneimine and then dipped into amine-modified SiO 2 ( Figure 5 c) [ 43 ]. They found a significant increase in the surface energy of the sized CF, both for the polar component due to the functional MXene and silica and the dispersive component due to the wrinkled coverage with SiO 2 nanoparticles, which increased roughness, enhancing wettability ( Figure 5 d,e).…”

“…Reprinted with permission from Ref. [ 43 ]. Copyright 2022 Society of Plastic Engineers; ( d ) Surface morphologies of CF (d1), CF/MXene (d2), and CF/MXene/SiO 2 (d3).…”

“…Reprinted with permission from Ref. [ 43 ]. Copyright 2022 Society of Plastic Engineers; ( e ) IFSS of the composites and SEM image of fracture surface of CF/MXene/SiO 2 after debonding test.…”