• Top library match: 6-hydroxy-2-phenylchromen-4-one #25302

• The direct‑reference evidence assigns the 660, 676, 689, and 702 cm⁻¹ bands to inorganic metal‑oxygen vibrations (Ti–O–Ti, Zn–O, Fe–O) [28][5], which conflicts with the organic polymer character observed in the rest of the spectrum; these inorganic assignments are not consistent with the bulk material direction.
• Library candidates such as sulfamide (#24854) and cyclohexane‑1,4‑diamine (#69210) are structurally remote from the observed aromatic‑rich spectrum and thus do not fit the spectral evidence.
• The library match confidence is very low (15 %); the most similar hit is a flavonoid that contains a carbonyl and aromatic ring but lacks the dominating aliphatic hydrocarbon character seen in the sample.
• The exact nature of the carbonyl‑containing species (ester, acid, ketone, or amide) cannot be definitively resolved without complementary information.
• The possibility of a styrene‑based copolymer with polar comonomers (e.g., acrylate, maleic anhydride, or sulfonated styrene) remains plausible but unconfirmed.

Recommended next steps: Perform a solubility or pyrolysis‑GC/MS analysis to verify whether the material is a styrene‑based polymer and to identify the nature of the carbonyl and sulfur‑containing units. Compare the spectrum with reference spectra of polystyrene, styrene‑acrylate copolymers, and sulfonated polystyrene to narrow the copolymer composition. Acquire a Raman spectrum to confirm the absence of inorganic oxide fillers that might account for the low‑wavenumber bands.