Peak top molecular weight, MGPC PU-kGy 22,000 12,800 9500 5400 1600 PUI)-0 17.4 6.6 32.8 100.0 4.6 PUI)-25 20.8 5.7 23.6 100.0 4.7 PUI)-50 41.2 7.9 29.4 100.0 4.4 PUI)-75 62.5 5.0 36.3 100.0 17.5 PUI)-100 112.6 11.5 43.7 100.0 4.6 PU2)-0 72.1 63.6 281.8 100.0 13.6 PU2)-25 125.0 35.7 207.1 100.0 10.7 PU2)-50 324.1 41.4 248.3 100.0 12.1 PU2)-75 348.0 52.0 232.0 100.0 7.2 PU2)-100 465.9 63.6 28 1.8 100.0 13.6 PUI) Nonchain-extended thermoplastic PU PU2) Chain-extended thermoplastic PU

Table 1: Relative peak height of MGPC of methanol extract from y-ray irradiated nonchain-extended and chain-extended thermoplastic Pus.