aromatic ester polymer, consistent with a terephthalate-type polyester
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aromatic ester polymer, consistent with a terephthalate-type polyester
Sample & Measurement Parameters
Identification Result
0%The FTIR pattern is most consistent with an aromatic ester-containing polymer, and the library nearest match is Poly(ethylene terephthalate). The sample shows a strong ester carbonyl band at 1713 cm⁻1 together with several C–O stretching bands at 1243, 1260, 1096, 1113, and 1017 cm⁻1, which supports a polyester-like material. Bands at 873 and 726 cm⁻1 are also compatible with an aromatic terephthalate-type ring substitution pattern. However, the overall library match quality is very weak, all top candidates have effectively zero similarity separation, and no direct or related literature evidence independently confirms a specific named polymer. For that reason, the most defensible conclusion is a terephthalate-type aromatic polyester direction rather than a firm entity assignment
Detailed interpretation
- Top library match: Poly(ethylene terephthalate) #12934
- Library confidence is low, with no meaningful similarity separation among the top candidates.
- The library consensus wording includes non-specific clues such as oxygen heterocycle / methyl, which does not uniquely support Poly(ethylene terephthalate).
- Some library feature flags mention halogens, but the reported sample peaks do not provide clear characteristic support for chlorinated or fluorinated material.
- The current evidence supports an aromatic polyester direction more strongly than a single exact polymer identity.
- The spectrum could fit related terephthalate or isophthalate polyesters, including PET-like or PBT-like materials, based on the shared ester and aromatic features.
- Without stronger library matching, comparison to authenticated reference spectra, or corroborating analytical data, Poly(ethylene terephthalate) should be treated as a tentative nearest library name only.
Library Comparison
Library Search Results — Top 15 Candidates
| Rank | Match % | Compound | SMILES | Spectrum No. | Action |
|---|---|---|---|---|---|
| Loading library candidates... | |||||
Peak Analysis
★ = Literature-supported assignment| # | Wavenumber (cm⁻¹) | Absorbance | Assignment | Citation | Assignment status | |
|---|---|---|---|---|---|---|
| 1 | · | 1243 | 1.00 | - | - | - |
| 2 | · | 726 | 0.92 | - | - | - |
| 3 | · | 1260 | 0.91 | - | - | - |
| 4 | · | 1096 | 0.89 | - | - | - |
| 5 | · | 1713 | 0.82 | - | - | - |
| 6 | · | 1113 | 0.59 | - | - | - |
| 7 | · | 1017 | 0.46 | - | - | - |
| 8 | · | 956 | 0.23 | - | - | - |
| 9 | · | 873 | 0.21 | - | - | - |
| 10 | · | 1406 | 0.17 | - | - | - |
| 11 | · | 1450 | 0.13 | - | - | - |
| 12 | · | 2927 | 0.12 | - | - | - |
| 13 | · | 1374 | 0.11 | - | - | - |
Appendix — Raw Spectrum
Comments and follow-up evidence
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