Sandwich-structured nano-adhesive based on the synergistic action of two nanoparticles (SiC and MWCNTs)

This study encompasses the development of sandwich-structured adhesive reporting the synergism in the functioning of two kinds of nanoparticles (NPs)-SiC (Silicon carbide) and MWCNTs (multiwalled carbon nanotubes). Two adhesives using MWCNTs and NPs of SiC in selected amounts were developed using Polyaryletherketone (PAEK) thermoplastic polymer as a base matrix. Fabricated joints using these adhesives were characterized for degglomeration and dispersion of NPs, lap shear strength (LSS), and failure modes. Based on the data on the LSS, the advantages and disadvantages of using individual NPs were analyzed, and the third adhesive was designed in a sandwich manner, where positive points of both the NPs were expected to work synergistically. The sandwich adhesive showed higher LSS than the individual ones, i.e., an 8.6% and 26% improvement to SiC-based and MWCNT-based adhesives, respectively. It was concluded that the strengthening mechanism of MWCNTs of bulk polymer in the central portion was beneficial. The two outer layers of SiC NPs in PAEK interacting with the two steel surfaces of coupons proved helpful in increasing friction and, hence, synergistically increasing the LSS of sandwich adhesive.