• Top library match: Hexanedioic acid, polymer with 1,4-butanediol and 1,2-propanediol, dodecanoate #146255

• Direct evidence references assign peaks at 465, 591, 756, and 833 cm⁻¹ to metal–oxygen, C–H out‑of‑plane, and halogen vibrations; these assignments originate from literature on inorganic compounds and do not directly match the polyester identification, indicating that those peaks may be due to minor additives, fillers, or spectral artifacts rather than the main polymer matrix.
• The library match, while high, does not uniquely confirm the exact diol ratio or the dodecanoate end‑group, and minor compositional variations (e.g., different adipate copolymers) could yield similar spectra.
• The weak bands at low wavenumbers (below 800 cm⁻¹) are not fully accounted for by the polyester model and could stem from trace inorganic additives, but they do not alter the primary polymer identification.

Recommended next steps: The weak absorption at 756 and 833 cm⁻¹ may warrant further investigation; confirmation of the specific polyester composition could be obtained by pyrolysis‑GC/MS or NMR to identify the exact diol and acid units. The presence of a broad O-H band at 3535 cm⁻¹ suggests potential hydrolysis; if relevant, a water content determination or end‑group analysis by chemical titration would clarify the extent of degradation.