FTIR ANALYSIS REPORT

FTIR Spectrum Analysis Report

No.: 20250604114445487521571 Date: 2025-06-04 16:46:15 Reported by: FTIR.fun Contact: [email protected]

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Library spectrum will appear here.

Infrared spectrum comparison chart. Analysis result: aromatic ester polymer, consistent with a terephthalate-type polyester.

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

Library spectrum Interactive sample curve Move the pointer to show the vertical guide line.

Top 15 candidates

Reference library candidates

Rank	Match %	Compound Name	Formula / SMILES	Library preview	Action
Reference candidates load with this Top-15 workbench.

Based on the library matches and evidence above.

Conclusion

aromatic ester polymer, consistent with a terephthalate-type polyester

General assessment

#12934 Initial rank 1 Current rank 1 Library lead match 0.0%

Conclusion

Nearest library label: Poly(ethylene terephthalate).
Top-ranked library candidates are largely terephthalate/isophthalate polyester materials rather than unrelated polymer classes.
1713 cm⁻1 is a characteristic ester carbonyl position for aromatic polyesters.

Main limitation

Library confidence is low, with no meaningful similarity separation among the top candidates.

Evidence

Key evidence

Kết quả khớp hàng đầu từ thư viện

Poly(ethylene terephthalate) #12934 | match 0.0%

Hướng vật liệu

aromatic ester polymer, consistent with a terephthalate-type polyester 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.

Support

Evidence supporting the conclusion

Only sample-relevant statements that support the present conclusion are shown here.

Nearest library label: Poly(ethylene terephthalate).
Top-ranked library candidates are largely terephthalate/isophthalate polyester materials rather than unrelated polymer classes.
1713 cm⁻1 is a characteristic ester carbonyl position for aromatic polyesters.
The cluster of C–O stretching bands between about 1260 and 1017 cm⁻1 supports an ester-linked polymer network.
873 and 726 cm⁻1 provide additional support for an aromatic substituted ring system compatible with terephthalate-based polymers.
A prominent band at 1713 cm⁻1 supports an ester carbonyl rather than a simple hydrocarbon material.
Bands at 1243, 1260, 1096, 1113, and 1017 cm⁻1 support multiple C–O and C–O–C vibrations expected for polyester structures.
Bands at 873 and 726 cm⁻1 are compatible with an aromatic ring environment seen in terephthalate-containing polymers.
The top library pattern is dominated by Poly(ethylene terephthalate), tere-/isophthalic polyesters, and poly(1,4-butylene terephthalate), indicating a common aromatic polyester theme.
The observed 2927 cm⁻1 band is consistent with aliphatic C–H stretching from polymer backbone methylene groups.

Limitations

Evidence that limits the conclusion

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.

Recommendation

Suggested next verification

Compare the sample directly against authenticated FTIR reference spectra for Poly(ethylene terephthalate), poly(1,4-butylene terephthalate), and mixed tere-/isophthalate polyesters, focusing on the fingerprint region from 1300 to 700 cm⁻1.
Acquire a higher-quality ATR-FTIR spectrum with improved signal-to-noise and baseline control to verify the aromatic out-of-plane region near 873 and 726 cm⁻1.
Use DSC to check for thermal transitions characteristic of PET versus related aromatic polyesters.
If exact polymer identification is important, confirm by complementary methods such as Raman spectroscopy or pyrolysis-GC/MS.

Peak analysis

Detected peaks and interpretation

★ = Literature-supported peak assignment.

Index	Characteristic	Wavenumber	Absorbance	Evidence	One-line interpretation	Citation	Confidence
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

Sample information and raw spectrum

Original uploaded spectrum for reference and verification.

Baseline correction method: Asymmetric Least Squares Smoothing

The wavelength range for analysis(cm-1): [(650, 4000)]

Raw spectrum without baseline correction or other processing:

aromatic ester polymer, consistent with a terephthalate-type polyester

FTIR Spectrum Analysis Report

Similarity-ranked Top-15 library comparison

Reference library candidates

aromatic ester polymer, consistent with a terephthalate-type polyester

Key evidence

Evidence supporting the conclusion

Evidence that limits the conclusion

Suggested next verification

Detected peaks and interpretation

Sample information and raw spectrum

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Hỗ trợ trực tuyến

aromatic ester polymer, consistent with a terephthalate-type polyester

Similarity-ranked Top-15 library comparison

Reference library candidates

aromatic ester polymer, consistent with a terephthalate-type polyester

Key evidence

Evidence supporting the conclusion

Evidence that limits the conclusion

Suggested next verification

Detected peaks and interpretation

Sample information and raw spectrum

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