Table 4.
Attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) peak assignment8–12 for high-density polyethylene (HDPE), linear low-density polyethylene (LDPE), and polypropylene (PP) when materials were not irradiated. Only main peaks for PP were considered. Expected peaks when materials were irradiated at doses >100 kGy are also given. X indicates peak present in polymer family, and — indicates peak not present in pristine polymer. *A change in the signal may occur due to gamma irradiation with high doses (>100 kGy).10 †Potential oxidation peaks observed in PP materials.13 Abbreviations used: C, carbon ; CH2, methylene group; CH3, methyl group; H, hydrogen; NA; not applicable; R1 and R2, side chains with number of carbon ≥1.
