• Top library match: Poly(ethyl acrylate) #347

• The library confidence is low, with no meaningful separation among candidates.
• No related-literature match was recovered to support a specific polymer or small-molecule identity.
• The limited peak set does not provide distinctive bands needed to securely identify Poly(ethyl acrylate) over other ester-containing materials.
• It remains unclear whether the sample is specifically Poly(ethyl acrylate), another acrylic polymer, a polyester, or a lower-molecular-weight ester-containing substance.
• The feature at 2740 cm⁻¹ is not by itself sufficient to define a unique structure in the absence of stronger corroborating bands.
• Additional characteristic fingerprint-region information would be needed to separate acrylate polymers from other ester-rich materials.

Recommended next steps: Recollect or inspect the full FTIR spectrum, especially the 1500-600 cm⁻¹ fingerprint region, to verify ester C-O-C band patterning and look for polymer-specific backbone features. Compare the sample directly against authenticated spectra of Poly(ethyl acrylate), a generic acrylic polymer, and representative aliphatic polyesters such as poly(butylene adipate). If the sample is a coating, adhesive, or extractable residue, run complementary analysis such as ATR-FTIR repeat measurement, DSC, or Py-GC/MS to distinguish an acrylate polymer from a polyester or small-molecule ester. Check for repeatable carbonyl peak shape and position across replicate measurements, since ester subclass assignment often depends on the detailed carbonyl and C-O band profile.