Loading halloysite nanotubes on MXene as functional composite filler towards a polybenzoxazine anticorrosion coating

Although MXene as an attractive two-dimensional additive can enhance the corrosion protection performance of an organic coating, it does not appear to have a beneficial effect on the longer-term corrosion resistance of poly-benzoxazine framework due to its high electrical conductivity. Therefore, in this work, the composite sheets and polybenzoxazine resin were prepared using some natural and renewable materials for a sustainable purpose. A novel polybenzoxazine (PCD) was firstly synthesized from green curcumin, 1,2-bis(2-aminoethoxy)ethane and paraformaldehyde through thermal polymerization with the polymerized high crosslinking network as an inhibitor carrier. Secondly, the sustainable and naturally renewable halloysite nanotubes were loaded onto the external surfaces or intercalated into the interstratified interfaces of the MXene carrier as a MXene@halloysite (MH) com-posite inhibitor. The MH could not only efficiently enhance the anticorrosion performance of the PCD coating, but also effectively reduce the aggregation of the nanotubes. When the MH was introduced into the PCD framework, the PCD-MH composite coating exhibited great corrosion protection performance compared with the other coatings. This work may lead to many promising applications of MXene-based nano-sheets in the field of metal-protection.