Our recent paper "Strain rate effects on the axial tensile behavior of crystalline polyethylene: Insights from molecular dynamics simulations" is accessible freely for 50 days from this link:
https://doi.org/10.1016/j.polymer.2024.126779
Key findings of this paper include a 7-fold strength increase in crystals with chain ends at higher strain rates, a shift in failure mode from chain end sliding to chain scission, and the influence of molecular weight on the failure mode.