Molecular Understanding of the Distinction between Adhesive Failure and Cohesive Failure in Adhesive Bonds with Epoxy Resin Adhesives

• DOI: 10.1021/acs.langmuir.3c04015
• Publication Date: 2024-03-27T02:39:25Z
• Authors: Yuta Tsuji
• Keywords: Adhesive Bonding

In the development of adhesives, an understanding fracture behavior bonded joints is inevitable. Two typical failure modes are known: adhesive and cohesive failure. However, a molecular process not as advanced that process. this study, research was developed to establish using example system in which epoxy resin hydroxyl-terminated self-assembled monolayer (SAM) surface. Adhesive modeled molecule pulled away from SAM Cohesive failure, on other hand, separating another surface or breaking covalent bond within resin. The results simulations based models described above showed calculations model breakdown intermolecular interactions agreed well with experimental literature. Therefore, it suggested adhesives most likely due between molecules. We further analyzed at interfaces found interface mainly accounted for by dispersion forces, whereas involve only forces but also various chemical interactions, including hydrogen bonds. selectivity explained fact varying functional group density affected forces.