Our CGMD findings were experimentally validated by comparing the welding strength of ENGAGE TM 8402 polyolefin (referred as Engage 8402 unless otherwise noted) and high-density polyethylene (HDPE) strips. The grafted polymer was represented by Engage 8402; an ethyleneoctane copolymer supplied by DOW with a density of 0.902 g/cm . Its melt flow index (MFI) is 30 g/10min at 190 ℃, a glass transition temperature (Tg) is -36 ℃, a melting temperature Tm is 96 ℃, and peak crystallization temperature Tc is 80.4 ℃. Using gel permeation chromatography (GPC), the average gap between sidechains (ng = Mg/M0) in Engage 8402 was estimated to be approximately ng = 17, with the sidechain length (nsc = Msc/M0) and the backbone length (nbb = Mbb/M0) being roughly 3 and 3000, respectively. Ungrafted linear polymers were experimentally validated with HDPE purchased from Sigma-Aldrich, which had a density of 0.952 g/cm 3 at 25 °C, an MFI of 12 g/10min at 190 ℃, and Tm of 125 ~ 140 °C. The backbone length (nbb = Mbb/M0  1825 based on GPC measurement) of HDPE was comparable to that of Engage 8402.