Enhancement of mechanical properties of epoxy resin matrix adhesives by high-performance fillers

This study aims to prepare functional fillers using isophorone diisocyanate (IPDI), amine-terminated butadiene acrylonitrile (ATBN), and graphene oxide (GO) to improve the performance of epoxy resin (EP) composite materials by enhancing filler dispersion and toughening. Unexpected results were obtained during the experimental and testing phases, achieving multiple bonding mechanisms. Successful grafting of IPDI and ATBN onto GO was confirmed using TEM, FT-IR, and XPS. The prepared composites underwent T-peel, shear, tensile, and impact testing. Compared to pure EP, the T-peel strength increased by 579%, the shear strength increased by 99%, and Al elements were detected in the T-peel samples. The tensile strength increased by 134%, and the impact strength increased by 65%, with an analysis of the impact morphology to explore the mechanism of IPDI and ATBN enhancement. Additionally, the dynamic mechanical performance of EP and its composites was tested, and various forms of Tg were analyzed. This functional filler can be applied to various resin matrices and effectively improve their performance.