• Top library match: 2-Fluorophenol #19

• The library search returned 2-Fluorophenol as the nearest match, but the extremely low similarity (0.0) and the lack of fluorine-characteristic bands indicate this is not the actual material; the chemical direction derived from the library consensus (methacrylate/carboxyl) is more reliable.
• Some direct literature assignments, such as the asymmetric vibration at 1155 cm⁻¹ originally interpreted for PTFE [6], are not chemically compatible with the dominant ester pattern and are excluded from the final interpretation.
• Without a definitive library match, the exact chemical identity cannot be determined; the material could be poly(methyl methacrylate) (PMMA), a related methacrylate copolymer, or a mixture of aliphatic esters.
• The presence of minor amounts of other functional groups (e.g., residual acid, additives) cannot be ruled out based solely on these six peaks.
• The direct evidence for the 1155 cm⁻¹ band remains ambiguous, with some sources attributing it to non-ester vibrations; its assignment to ester C-O is based on the overall spectral pattern rather than a single unequivocal reference.

Recommended next steps: Compare the spectrum with a reference spectrum of poly(methyl methacrylate) (PMMA) to verify the backbone structure. Perform complementary analysis by pyrolysis-GC/MS to identify the monomer composition and confirm the methacrylate character. If quantification of ester content is needed, use the carbonyl band intensity with appropriate calibration.