Moisture Absorption Behavior and Adhesion Properties of GNP/Epoxy Nanocomposite Adhesives

Abstract

In the current work, an attempt has been made to investigate the effect of Graphene Nanoplatelets (GNP) reinforcement to water absorption behavior and mechanical properties of adhesive bonding with epoxy. Epoxy adhesive with various GNP content (i.e., 0.0~2.0 wt%) was utilized to joint aluminum adherend subjected to various immersion periods (i.e., 0~60 days). Subsequently, the effect of GNP reinforcement on water uptake, water absorption rate and tensile shear strength was investigated. Depending on GNP content, two distinct behaviors in water uptake and moisture absorption rate have been observed; specimens with lower GNP content (0.5~1.0 wt%) have demonstrated increased/retention of water uptake and water absorption rate regardless of immersion period. Meanwhile, at higher GNP content (1.5~2.0 wt%), decreased water uptake and water absorption rate are generally observed. At similar GNP content, regardless of immersion periods, water immersed specimens generally demonstrate higher or retention of shear strength when compared to specimens at 0-day immersion period. These observations suggest that the relation between moisture absorption behavior and mechanical properties of GNP-reinforced adhesive with GNP content are rather complex which might be attributed to the interplay of several possible mechanisms.

Hybrid calotropis gigantea fibre-reinforced epoxy composites with SiO2’s longer-term moisture absorbable and its impacts on mechanical and dynamic mechanical properties

“…As the epoxy material gets more viscous when the SiO 2 content is increased, this impact may be amplified. As a result, the beginning of fractures and their progression are caused by a higher level of interface stress, which was also found by Kong et al [39]. This finding may be due to irregular dispersal of SiO 2 while blending, leading to a dramatically decreased effective area of the material at 3 wt% SiO 2 addition.…”

“…Nevertheless, incorporating more SiO 2 into the epoxy matrix than 1.5 wt% leads to a decrease in bending strength because the SiO 2 nanoparticles clump together as a consequence of the epoxy resin's increased viscosity, as seen by the SEM images. As a result, several studies have supported the same tendency of increased viscosity with a substantial amount of nano SiO 2 [39]. The glass fibre-reinforced epoxy composites containing nano-TiO 2 particles exhibited a similar pattern of bending strength data that revealed a decrease in bending strength because of the aggregate impact, as seen by Natrayan et al [47].…”

Catechol-Amine-Decorated Epoxy Resin as an Underwater Adhesive: A Coacervate Concept Using a Liquid Marble Strategy

“…This could be due to the moisture-induced plasticization effect on the cured adhesive network structure (Figure ). , …”

“…This could be due to the moisture-induced plasticization effect on the cured adhesive network structure (Figure 8). 44,45 Further, the gel point and swelling index (eqs 1 and 2 given in the Experimental Section) of the cured adhesives were determined by dipping in distilled water for different durations. The swelling index is a measure of water interaction with the cured network structures.…”

Thermal Properties of Unsaturated Polyester Reinforced Kenaf Core Fiber with Hybrid Nanofillers of Cellulose Nanocrystal and Graphene Nanoplatelet

“…CNC also were found for their reinforcement in nano-composite that usually will exhibit properties enhancement such as biodegradability, thermal, mechanical and barrier properties when compared to neat polymer [12], [13]. While GNP are reasonable inorganic nano-size materials to be used as additional hybrid reinforcing filler which were found for their incorporation in composite can improve thermal, mechanical, physical and conductivity properties [14], [15]. Hence improving thermal properties of UPE bio-composite with an efficient nanofiller is interesting and this approach were expected to create highperformance composite with biodegradable properties…”