[...]carbyne is about two times stronger than graphene and carbon nanotubes[...]
[...]The researchers found that carbyne is massively strong (6.0–7.5×107N∙m/kg, vs. 4.7–5.5×107 N∙m/ kg for
graphene), very high tensile stiffness (it’s almost impossible to stretch), fairly chemically stable, and yet surprisingly flexible.[...]