While the measured Young's modulus of HDPE (E = 661 MPa) was modestly higher than that of either i PrSi8-co-PE-50-HMW (E = 491 MPa) or recycled i PrSi8-co-PE-50-HMW (E = 451 MPa), all values were within the expected range for HDPE materials (Figure , Table , Figure ). Likewise, all three samples were found to have similar yield strengths (σy = 19.1-22.1 MPa) and strains-at-break (397-461%). Thus, our Si-O-containing HDPE displays mechanical properties on par with HDPE, and it can be deconstructed and recycled to give materials that also are similar to HDPE. These findings represent an advance for ROMP-derived PE mimics, as previous studies have found that such materials are either unsuitable for tensile testing or mechanically weak compared to HDPE. Moreover, no previous studies have demonstrated recycling of such polymers.