• Top library match: Poly(caprolactone),monohydroxy terminated #65435

• The best library hit has zero reported similarity, S-O the named match itself is not strong enough for a firm entity-level identification.
• The observed peak list does not provide a uniquely identifying pattern that clearly separates polycaprolactone from other oxygen-containing ester polymers or oligomers in the top-candidate set.
• It remains uncertain whether the sample is specifically polycaprolactone, a hydroxyethyl methacrylate-based polymer, another aliphatic polyester, or a related oxygenated oligomer.
• The broad 3373 cm-1 band may reflect terminal hydroxyl groups, absorbed water, or another hydrogen-bonding contribution.
• The split carbonyl region at 1708 and 1725 cm-1 may indicate more than one carbonyl environment, crystallinity effects, or a mixture, but the current evidence does not distinguish among these possibilities.

Recommended next steps: Compare the full spectrum directly against authenticated FTIR references for Poly(caprolactone),monohydroxy terminated, poly(2-hydroxyethyl methacrylate), and common aliphatic polyesters such as poly(trimethylene succinate). Check for polyester-specific thermal behavior by DSC; a melting transition near the expected range for semicrystalline aliphatic polyester would help separate polycaprolactone-like material from methacrylate-based materials. Use 1H and 13C NMR to verify whether the sample contains caprolactone-type methylene environments, methacrylate backbone features, or mixed ester components. If the 3373 cm-1 band is important to the assignment, dry the sample and reacquire FTIR to determine whether the band persists as a true hydroxyl feature rather than adsorbed moisture.