Rapid photo-responsive self-healing cross-linked polyurea/ polydopamine nanocomposites with multiple dynamic bonds and bio-based rosin

Interfacial Study of Steel Joints Prepared with a Catechol-Modified Epoxy Adhesive with Enhanced Bonding Performance and Durability

“…Furthermore, Figures b and S2 show that the tensile strength of PMEA before aging is significantly higher than that of EA, which may be due to the introduction of benzene rings in PMEA, increasing the rigidity of its network and resulting in an increase in tensile strength and a decrease in strain. However, the tensile strength of CMEA is notably lower than that of PMEA and EA, likely due to the incorporation of a higher density of phenolic hydroxyl groups, resulting in an excessively high density of hydrogen bonds of its network, thereby significantly increasing the brittleness of CMEA and leading to a significant decrease in tensile strength. , Figure b shows that there was a significant reduction in the tensile strength of all adhesive bulk specimens after 32 days, likely attributable to water absorption, which may lead to a decrease in the bonding strength of the bonding joints during hydrothermal aging. Therefore, to ascertain the specific contribution of CMEA to the aging performance of the bonding joints, we compared the rates of decrease in bonding strength to those in bulk strength for the three adhesives.…”