Peptide nanotube polymers and methods of making such are disclosed. The peptide nanotube polymers are comprised of alternating monomers of the first peptide ring and monomers of the second peptide ring covalently bonded to one another via a linker, and can be functionalized. The described peptide nanotube polymers can enjoy the combined properties of healing and toughness, self-reporting, and tunability and actuation.