Synthesis of Catechol-Functionalized Silsesquioxane for Enhancing Cohesive and Adhesive Forces of Epoxy Adhesive
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Epoxy resins have been used in the field of adhesive and have outstanding chemical, thermal, mechanical properties. However, these performances are greatly affected by the absorbed moisture which results in volume expansion, cracks, decrease of Tg and adhesion. In this study, dopamine methacrylamide (DMA) was selected to enhance both cohesive and adhesive force of epoxy adhesive. DMA has a catechol moiety, which includes in marine mussel foot proteins and could adhere to various kinds of surfaces. We synthesized catechol-functionalized polyhedral oligomeric silsesquioxane (POSS) and ladder-like polysilsesquioxane (LPS) via simple sol-gel process, and applied them to prepare epoxy nanocomposites of DGEBA and DDS system using hydrogen bonding and π-π stacking interaction. Finally, we analyzed thermal properties and mechanical properties including tensile, flexure, impact and lap shear test. This research was supported by Korea National University of Transportation in 2020.