• トップライブラリ一致: 共重合PP #713

• Direct‑literature evidence returned a wide range of group assignments (e.g., O–Mg–O, Zn–O, tetrahedral sites, Si–O) from sources that are not chemically compatible with the polyolefin material; these reflect the diversity of the literature corpus rather than meaningful spectral evidence for the present sample.
• The small peak at about 1033 cm⁻¹ could partly reflect minor oxidation or the presence of additives, but it does not undermine the primary identification.
• The exact comonomer composition (e.g., ethylene content) cannot be inferred from the FTIR spectrum alone without a suitable calibration.

推奨される次のステップ: Perform differential scanning calorimetry (DSC) to confirm the copolymer type (random or block) and to estimate the ethylene/propylene ratio. If further confirmation is required, obtain a ¹³C NMR spectrum to quantify the levels of ethylene incorporation.