An investigation on industrial adhesive nano-modified by graphene nanoplatelets under extreme environmental conditions

Investigation of effects of extreme environment conditions on multiwall carbon nanotube‐epoxy adhesive and adhesive joints

“…The CNTs were weighed on a SHI-MADZU AUW 220D high precision analytical balance (0.00001 g). As recognized by Nascimento et al, [7] the SikaPower-456LB high viscosity (700 Pa.s), requires the usage of un-conventional dispersion process. A mechanical grease worker Koehler model K18100 served a tool for dispersing the CNT into the resin.…”

“…One of the main uses of the grease worker is to test the consistency of greases and lubricants. [7] According to ASTM D217, [26] the grease worker functions at a rate of 60 strokes ±10 strokes per minute with a minimum length of 63 mm and comprising a grease cup, a cover and a plunger assembly which is composed by a handle and a perforated plate. The pre-mixing process was performed with a spatula, at room temperature, in the epoxy resin, directly in the cup, avoiding transfer losses, during $2 min.…”

“…[1,[4][5][6] Additionally, adhesives are easy to apply, are electrically insulating, have noise reduction features and contribute to reducing the cost during the manufacturing of adhesive components. [7][8][9] Due to the brittle characteristics of epoxy resin, lower tensile strength and toughness, the use of this polymer material in adhesives joints has some restrictions, indicating low resistance to crack propagation and debonding failure. [1,2,10,11] To increase the performance of the epoxy-based adhesive, once the bond between the matrix and substrate is often the weakest part of composite structure, [8,12] several nano fillers are used to reinforce these adhesives, producing materials that exhibit increases in shear strength, stiffness, modulus and toughness.…”

“…[1,4,18] Other aspects that influence adhesive performance are the thickness of the adherent, the roughness of the surface adherent, the thickness of the bond line and the wettability of the adhesive over the surface where it is applied. [1,5,6] According to Nascimento et al, [7] it is expected that adhesive joints are strongly influenced by environmental conditions causing a considerable amount of adhesive failures. As commented by Alderucci et al, [19] a humid environment is responsible for the plasticization of the adhesive, which results in a decrease in the glass transition temperature (T g ).…”

Βio-Based Epoxy/Amine Reinforced with Reduced Graphene Oxide (rGO) or GLYMO-rGO: Study of Curing Kinetics, Mechanical Properties, Lamination and Bonding Performance

“…Aradhana et al used rGO/Araldite GY250 to bond aluminum adherents and showed ~50% increment compared to pristine epoxy [22]. Several studies reported also improvements on epoxies using GO [33] or graphene nanoplatelets [34][35][36][37][38][39].…”