Abstract
This research presents the interaction of the epoxy polymer diglicydil ether of bisphenol-A (DGEBA) with silica (SiO2) nanoparticles plus zirconia (ZrO2) nanoparticles obtained via the sol-gel method in the synthesis of an epoxy-silica-zirconia hybrid adhesive cured with polyamide. ZrO2 nanoparticles were added to the epoxy-silica hybrid adhesive produced in situ to modify the apparent shear strength of two adhesively bonded aluminum specimens. The results showed that the addition of different amounts of ZrO2 nanoparticles increased the shear strength of the adhesively bonded aluminum joint, previously treated by sandblasting, immersion in hot water and silanized with a solution of hydrolyzed 3-glycidoxipropyltrimethoxysilane (GPTMS). The morphology and microstructure of the nanoparticles and aluminum surfaces were examined by scanning electron microscopy (SEM), and elemental analysis was performed with the Energy-dispersive X-ray spectroscopy (EDS) detector; the chemical groups were investigated during the aluminum surface modification using Fourier transform infrared spectroscopy (FTIR).
Highlights
Epoxy adhesives have been used for many years in a great number of engineering applications, e.g., aerospace, marine and automotive industries, where high durability bonded aluminum structures are required [1,2]
3a shows shows the the size size distribution distribution by by the the number number of of zirconia zirconia nanoparticles nanoparticles used used as as aaa second second filler in the epoxy-silica hybrid adhesive, which corroborates the results presented in
The results of the shear strength test carried out on the aluminum specimens bonded adhesively shows, in the great majority of the assays, that there is an increase in toughness corresponding with the increase in the zirconia content
Summary
Epoxy adhesives have been used for many years in a great number of engineering applications, e.g., aerospace, marine and automotive industries, where high durability bonded aluminum structures are required [1,2]. It is well known that epoxy organic materials cannot be used in high performance applications due to their limited mechanical, chemical and thermal properties. A systematic investigation of both the hybrid materials synthesis and mechanical response is an important issue to improve those properties [3]. Thermosetting epoxy polymers are widely used as adhesives, they are amorphous and highly-crosslinked, and the microstructure of these materials has many interesting properties for structural engineering applications, such as a high modulus, high failure strength, low creep and interesting adhesive properties. The epoxy-silica hybrid system is one of the most recognized composites in the field of adhesives, since in addition to the excellent adhesive properties of cured epoxy polymers, the silica nanoparticles, or nanofillers strengthen the epoxy resin, improving the toughness of the organic matrix [5]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
