چكيده لاتين
In this study, multilayered MXene nanoparticles were synthesized using a top-down approach from a MAX phase precursor with the general formula 〖 M〗_(n+1) AX_n , where M is a transition metal such as Ti, A is an element from groups 13 or 14 of the periodic table, and X is either carbon or nitrogen. After surface modification of these nanoparticles with aminopropyltriethoxysilane (APTES), the effects of both pristine and surface-modified MXene on the adhesive, mechanical, and thermal stability properties of epoxy-based structural film adhesives were investigated.
To confirm the successful synthesis and structure of the multilayered MXene, Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), and Transmission Electron Microscopy (TEM) analyses were performed. Additionally, Fourier Transform Infrared Spectroscopy (FTIR) and Thermogravimetric Analysis (TGA) were used to identify functional groups on the surface of the pristine and modified nanoparticles. The thermal stability of the resulting nanocomposite adhesives was evaluated through TGA and char yield measurements. Mechanical properties were assessed via tensile testing, while adhesive performance was evaluated using single-lap shear strength tests on aluminum joints and peel strength tests. Abrasion resistance was determined through wear testing, and water uptake experiments were conducted to assess corrosion resistance. Furthermore, the microstructure and nanoparticle dispersion in the epoxy matrix were analyzed using Field Emission Scanning Electron Microscopy (FESEM) and TEM.
The results indicated that at a loading of 0.5 wt% of MXene, the lap shear strength and peel strength of the epoxy film adhesives reached their maximum values, showing respective increases of 119.2% and 129.0% compared to the neat adhesive. The 0.5 wt% APTES-modified MXene sample, considered the optimal formulation, showed further improvements of 54.6% in lap shear strength and 33% in peel strength compared to the unmodified MXene sample, indicating effective surface functionalization. In tensile testing, the 0.5 wt% MXene-containing sample showed the highest performance, with improvements of 58.88% in tensile strength, 36% in modulus, and 152% in toughness compared to the neat epoxy. The sample containing 0.5 wt% APTES-modified MXene showed even greater enhancements of 73%, 43%, and 178% in these respective properties. In TGA analysis, the sample with 0.5 wt% pristine MXene exhibited a 71% increase in degradation onset temperature and a 105% increase in residual char content compared to the neat sample. For the APTES-modified MXene, these values further increased by 74% and 113%, respectively. Compared to the unmodified MXene sample, the modified version showed additional increases of 1.5% in degradation onset temperature and 3% in char yield.
