  Carbon-based tubular materials have sparked a great interest for future
electronics and optoelectronics device applications. In this work, we
computationally studied the mechanical properties of nanotubes generated from
popgraphene (PopNTs). Popgraphene is a 2D carbon allotrope composed of $5-8-5$
rings. We carried out fully atomistic reactive (ReaxFF) molecular dynamics for
PopNTs of different chiralities ($(n,0)$ and $(0,n)$) and/or diameters and at
different temperatures (from 300 up to 1200K). Results showed that the tubes
are thermally stable (at least up to 1200K). All tubes presented stress/strain
curves with a quasi-linear behavior followed by an abrupt drop of stress
values. Interestingly, armchair-like PopNTs ($(0,n)$) can stand a higher strain
load before fracturing when contrasted to the zigzag-like ones ($(n,0)$).
Moreover, it was obtained that the Young's modulus ($Y_{Mod}$) (750-900 GPa)
and ultimate strength ($\sigma_{US}$) (120-150 GPa) values are similar to the
ones reported for conventional armchair and zigzag carbon nanotubes. $Y_{Mod}$
values obtained for PopNTs are not significantly temperature dependent. While
the $\sigma_{US}$ values for the $(0,n)$ showed a quasi-linear dependence with
the temperature, the $(n,0)$ exhibited no clear trends.
