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styrenic aromatic hydrocarbon polymer

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Result No.: 20250423235425107656881-1 Owner: publicuser Comments: 1
FTIR ANALYSIS REPORT

FTIR Spectrum Analysis Report

No.: 20250423235425107656881-1 Date: 2025-04-24 03:39:06 Reported by: FTIR.fun Contact: [email protected]

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Top15

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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

styrenic aromatic hydrocarbon polymer

General assessment
-
#46662 Initial rank 1 Current rank 1 Library lead match 0.0%
Conclusion
  1. Nearest library match: Polystyrene, with multiple additional Polystyrene entries occupying the top candidate positions.
  2. Common Top-15 library pattern: predominantly styrenic, aromatic hydrocarbon polymer spectra.
  3. Aromatic C-H stretching is present at 3031, 3071, and 3081 cm-1.
Main limitation

The library match confidence is reported as low, so the retrieval alone is not strong enough for a firm material identification.

Evidence & interpretation
Evidence

Key evidence

Library lead candidate
Polystyrene #46662 | match 0.0%
Material direction
styrenic aromatic hydrocarbon polymer The FTIR pattern is most consistent with a styrenic aromatic hydrocarbon polymer, with Polystyrene as the nearest library match. This direction is supported by aromatic C-H stretching near 3031-3081 cm-1, aromatic ring bands at 1604 and 1493 cm-1, strong out-of-plane aromatic C-H bands at 701, 751, and 758 cm-1, and aliphatic C-H stretches at 2926 and 2857 cm-1, which together are characteristic of a phenyl-substituted hydrocarbon polymer. However, the library confidence is very low and no direct reference or related-literature evidence independently confirms a specific entity assignment, so the most defensible conclusion is a styrenic aromatic hydrocarbon polymer direction rather than a firm entity identification.
Support

Evidence supporting the conclusion

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

  1. The FTIR pattern is most consistent with a styrenic aromatic hydrocarbon polymer, with Polystyrene as the nearest library match. This direction is supported by aromatic C-H stretching near 3031-3081 cm-1, aromatic ring bands at 1604 and 1493 cm-1, strong out-of-plane aromatic C-H bands at 701, 751, and 758 cm-1, and aliphatic C-H stretches at 2926 and 2857 cm-1, which together are characteristic of a phenyl-substituted hydrocarbon polymer. However, the library confidence is very low and no direct reference or related-literature evidence independently confirms a specific entity assignment, so the most defensible conclusion is a styrenic aromatic hydrocarbon polymer direction rather than a firm entity identification.
  2. Nearest library match: Polystyrene, with multiple additional Polystyrene entries occupying the top candidate positions.
  3. Common Top-15 library pattern: predominantly styrenic, aromatic hydrocarbon polymer spectra.
  4. Aromatic C-H stretching is present at 3031, 3071, and 3081 cm-1.
  5. Aromatic ring vibrations are present at 1604 and 1493 cm-1.
  6. Out-of-plane aromatic C-H bands at 701, 751, and 758 cm-1 support a styrenic aromatic substitution pattern.
  7. Aliphatic C-H bands at 2926, 2857, 1450, 1376, and 1360 cm-1 support a hydrocarbon polymer framework.
  8. The leading library candidates are overwhelmingly Polystyrene entries, and the broader Top-15 pattern is dominated by styrenic materials.
  9. The sample shows characteristic aromatic ring features at 1604 and 1493 cm-1 together with aromatic C-H stretching at 3031, 3071, and 3081 cm-1.
  10. Bands at 701, 751, and 758 cm-1 are consistent with aromatic C-H out-of-plane bending expected for a styrenic phenyl ring environment.
  11. Aliphatic C-H stretching at 2926 and 2857 cm-1 supports a hydrocarbon polymer backbone.
  12. No clear carbonyl, hydroxyl, nitrile, or other strongly heteroatom-bearing functionality is indicated by the reported peak list, which keeps the direction within a largely hydrocarbon aromatic polymer class.
Limitations

Evidence that limits the conclusion

  • The library match confidence is reported as low, so the retrieval alone is not strong enough for a firm material identification.
  • No related-literature match was recovered to narrow the assignment beyond a styrenic aromatic polymer direction.
  • The reported evidence does not establish whether the material is pure Polystyrene or a related styrenic material, blend, copolymer, or modified form.
  • The present evidence supports styrenic aromatic chemistry but does not securely distinguish Polystyrene from closely related styrenic polymer materials.
  • Minor bands such as 903, 1025, and 1070 cm-1 are not sufficient here to prove a more specific formulation without stronger reference support.
  • Because direct literature and reference confirmation are absent, the entity-level assignment remains less certain than the broad chemical direction.
Recommendation

Suggested next verification

  • Compare the sample directly against a verified Polystyrene reference spectrum collected under the same ATR or transmission conditions, focusing on the relative intensities and exact positions of the 1604, 1493, 758, and 701 cm-1 bands.
  • Inspect the full spectrum for the typical styrenic fingerprint-region pattern and for any weak heteroatom-associated bands that could indicate additives, oxidation, or copolymerization.
  • If a firmer identification is needed, use complementary methods such as Raman spectroscopy, DSC or TGA, or pyrolysis-GC/MS to distinguish Polystyrene from other styrenic polymers or blends.
  • If the sample is a manufactured article, analyze a cleaned interior cross-section to reduce interference from surface coatings, weathering, or contamination.
Peak analysis

Detected peaks and interpretation

★ = Literature-supported peak assignment.

Index Characteristic Wavenumber Absorbance Evidence One-line interpretation Citation Confidence
1 · 701 1.00 - - - -
2 · 2926 0.92 - - - -
3 · 1450 0.91 - - - -
4 · 3031 0.91 - - - -
5 · 751 0.83 - - - -
6 · 758 0.71 - - - -
7 · 1493 0.41 - - - -
8 · 3071 0.37 - - - -
9 · 3081 0.33 - - - -
10 · 2857 0.31 - - - -
11 · 1604 0.28 - - - -
12 · 1025 0.20 - - - -
13 · 903 0.14 - - - -
14 · 1070 0.13 - - - -
15 · 1360 0.11 - - - -
16 · 1376 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:

Sample spectrum image
Discussion

Comments and follow-up evidence

Use this area to continue the interpretation, ask questions, or add extra verification evidence.

Admin  from : Seattle, United States
  • 24 Apr '25

The user from Taiwan (IP: 2407::) uploaded a DOCX file containing three IR spectra. Swipe up to view the qualitative analysis of the first spectrum. The user also expressed intent to calculate sample thickness using interference peaks. Based on the spectra, the analysis was performed at wave numbers 2501 and 2563, yielding an interference peak difference (V₁ - V₂) of 62 cm-1 and ΔN = 1. By inputting the film's refractive index(n), the sample thickness (d) was determined.Here is the original spectrum of the sample extracted from the DOCX file.1.png

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  • Page 1 of 1
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