The hydrogenated copolymer products precipitated from 2-MeTHF, allowing for collection without the need for further purification. Successful hydrogenation was confirmed by Fourier Transform Infrared (FTIR) spectroscopy and 1 H NMR spectroscopies, which showed disappearances of the C=C bending feature at 1603 cm -1 (Figure ) and olefinic proton resonances (Figures ), respectively. Size exclusion chromatography yielded molar masses of ~40 kDa for all samples and dispersities ranging from 2-2.7, which agrees well with other reported examples of ROMP-based PE-like materials (Table ). We noted that these molar mass values are below those of typical commercial HDPE, and thus we set out to tune these reaction conditions to obtain a higher molar mass material suitable for mechanical property testing. Indeed, by shortening the reaction time to 10 min, which precludes intra-chain backbiting, and reducing the reaction concentration to 0.5 M to compensate for the decreased solubility of longer aliphatic chains, sample i PrSi8-co-PE-50-HMW with a molar mass of 154 kDa was obtained (Table , Figures ).