2024 Volume 60 Issue 2 Pages 25-31
The relationship between the dispersion state of carbon nanotubes（CNTs）in epoxy resin adhesives and the mechanical properties of the epoxy resin adhesives depending on the difference of surface coating and crystallinity of CNTs was investigated . In this study, epoxy adhesives consisting of bisphenol A type epoxy resin and core-shell rubber are used as the base material, because this type of the epoxy adhesive is a typical structure bonding material in multi-material vehicle components. When expandable graphite（EG）is added to the epoxy adhesive for easy disassembly of the end-life of vehicles, the mechanical properties of the epoxy adhesive deteriorate because of the poor interfacial interaction between the surface of EG and epoxy resin. CNTs as reinforcing nanofillers are known to increase the strength of resins significantly by adding in small quantities, but the reinforcement effect varies depending on the difference in dispersibility through the interactions in the interface between the CNT and the epoxy resin caused by the difference of surface treatment and structure of CNTs. Improved mechanical properties of the epoxy adhesives containing EG were observed in the case of local dispersion of acrylic polymer coated multi-walled CNTs（MWCNTs）as individual particles near CSR with the shell of the same type of acrylic polymer and the selective dispersion of single-walled CNTs（SWCNTs）, which were pre-dispersed in diluent reactive with hardener component, in epoxy matrix at 1/9 loading amount of SWCNTs in comparison with that of MWCNTs.
