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EVA PE=1-9

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Số kết quả: 20260407070238713601249 Chủ sở hữu: sjh Bình luận: 0
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FTIR ANALYSIS REPORT

FTIR Spectrum Analysis Report

No.: 20260407070238713601249 Date: Reported by: FTIR.fun Contact: [email protected]

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Top15

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Top 15 candidates

Reference library candidates

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Based on the library matches and evidence above.

Conclusion

EVA PE=1-9

Entity identified
Độ tin cậy tổng thể
#65 Initial rank 1 Current rank 1 Library lead match 89.3%
Conclusion
  1. The library search returns EVA PE=1-9 as the top match (similarity 0.86) and the next candidates (paraffin, Cera Flava, 5%EVA PE, 10%EVA PE, ethylene vinyl acetate) cluster around EVA‑polyethylene wax chemistries, reinforcing the EVA direction.
  2. The coexistence of strong ester carbonyl, C–O, and prominent alkane-type C–H bands is chemically coherent with a vinyl acetate-modified polyethylene.
  3. The direct evidence from [7] explicitly assigns the 1732 cm⁻¹ peak to a carbonyl group, and the supporting data from [1] and [2] confirm the aliphatic C–H stretching assignments at 2849, 2917, and 2955 cm⁻¹.
Main limitation

A band at 1555 cm⁻¹ is attributed in literature to N–H bending (amide II) [5], a functional group absent in pure EVA; this band is not characteristic of the expected copolymer chemistry.

Evidence & interpretation
Evidence

Key evidence

Kết quả khớp hàng đầu từ thư viện
EVA PE=1-9 #65 | match 89.3%
Hướng vật liệu
Ethylene-vinyl acetate copolymer (EVA) The sample is identified as an ethylene-vinyl acetate (EVA) copolymer with high spectral similarity to the library entry EVA PE=1-9. The spectral features are dominated by the ester carbonyl at 1732 cm⁻¹, C–O stretching at 1112 and 1237 cm⁻¹, and strong aliphatic C–H bands at 2917, 2849, 2955 cm⁻¹ together with the CH₂ rocking at 720 cm⁻¹, all consistent with a polyethylene backbone substituted with acetate ester side groups.
Supporting peaks
720 cm-1 757 cm-1 1112 cm-1 1237 cm-1 1377 cm-1 1462 cm-1 1555 cm-1 1732 cm-1
Supporting groups
methyl alkyl_c_h aromatic o_c_o amide ester c_o
Support

Evidence supporting the conclusion

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

  1. The sample is identified as an ethylene-vinyl acetate (EVA) copolymer with high spectral similarity to the library entry EVA PE=1-9. The spectral features are dominated by the ester carbonyl at 1732 cm⁻¹, C–O stretching at 1112 and 1237 cm⁻¹, and strong aliphatic C–H bands at 2917, 2849, 2955 cm⁻¹ together with the CH₂ rocking at 720 cm⁻¹, all consistent with a polyethylene backbone substituted with acetate ester side groups.
  2. The library search returns EVA PE=1-9 as the top match (similarity 0.86) and the next candidates (paraffin, Cera Flava, 5%EVA PE, 10%EVA PE, ethylene vinyl acetate) cluster around EVA‑polyethylene wax chemistries, reinforcing the EVA direction.
  3. The coexistence of strong ester carbonyl, C–O, and prominent alkane-type C–H bands is chemically coherent with a vinyl acetate-modified polyethylene.
  4. The direct evidence from [7] explicitly assigns the 1732 cm⁻¹ peak to a carbonyl group, and the supporting data from [1] and [2] confirm the aliphatic C–H stretching assignments at 2849, 2917, and 2955 cm⁻¹.
  5. The strong band at 1732 cm⁻¹ is attributable to the ester carbonyl (C=O) stretching vibration of the vinyl acetate comonomer.
  6. Ester C–O stretching bands are observed at 1112 cm⁻¹ and 1237 cm⁻¹, the latter corresponding to the asymmetric C–O–C mode typical of acetate esters.
  7. The prominent pair at 2917 cm⁻¹ (asymmetric) and 2849 cm⁻¹ (symmetric) arises from methylene (CH₂) stretching of the polyethylene backbone.
  8. The CH₂ rocking band at 720 cm⁻¹ confirms the presence of extended methylene sequences, further supporting the polyethylene character of the copolymer.
  9. A methyl deformation band appears near 1377 cm⁻¹, consistent with the terminal CH₃ groups and the methyl group of the acetate moiety.
  10. Many of these assignments are corroborated by literature reports, e.g., the long-chain methylene rocking at 720 cm⁻¹ is assigned in processed hydrocarbon-rich products [13] and the carbonyl at 1732 cm⁻¹ is attributed to a carbonyl group in hemicellulose and related oxygenated aliphatic systems [7].
  11. Major peak assignments include 2917: Related literature: Aliphatic C-H stretching modes (asymmetric CH2, symmetric CH2, and asymmetric CH3) | Direct reference: alkyl c h; c o single bond; 2849: Related literature: Aliphatic C-H stretching modes (asymmetric CH2, symmetric CH2, and asymmetric CH3); 1462: Related literature: Aliphatic CH2/CH3 bending and Amide III region | Direct reference: alkyl c h; c o single bond; 720: Related literature: Long-chain methylene rocking (CH₂)ₙ | Direct reference: alkyl c h; c o single bond.
Limitations

Evidence that limits the conclusion

  • A band at 1555 cm⁻¹ is attributed in literature to N–H bending (amide II) [5], a functional group absent in pure EVA; this band is not characteristic of the expected copolymer chemistry.
  • The moderate band near 757 cm⁻¹ cannot be confidently assigned to a functional group that is typical of EVA; direct literature linking it to CF₂ bending is irrelevant to this polymer.
  • The precise vinyl acetate content cannot be deduced from the FTIR spectrum alone; the library hit EVA PE=1-9 suggests a low proportion of vinyl acetate, but the actual ratio should be confirmed by an independent method.
  • Weak or unexplained features such as the 1555 cm⁻¹ band could arise from a minor additive, residual processing aid, or surface contaminant, adding uncertainty to the purity assessment.
Recommendation

Suggested next verification

  • Perform quantitative analysis of the vinyl acetate content by hydrolysis and titration, NMR spectroscopy, or calibrated FTIR method.
  • Use differential scanning calorimetry (DSC) to confirm the melting behavior and crystallinity of the polyethylene phase, verifying it is indeed a copolymer rather than a blend.
  • If the 1555 cm⁻¹ band persists after purification, apply complementary techniques (e.g., Raman, XPS, or extraction) to identify possible amide‑containing additives or contaminants.
Peak analysis

Detected peaks and interpretation

★ = Literature-supported peak assignment.

Index Characteristic Wavenumber Absorbance Evidence One-line interpretation Citation Confidence
1 ★ 2917 1.00 Gán hỗ trợ bởi tài liệu Dải tại 2917 cm-1 được gán cho alkyl C-H[18]. [18] Độ tin cậy LLM
2 ★ 2849 0.65 Gán hỗ trợ bởi tài liệu Dải tại 2849 cm-1 được gán cho alkyl C-H[18]. [18] Độ tin cậy LLM
3 ★ 1462 0.33 Gán hỗ trợ bởi tài liệu Dải tại 1462 cm-1 được gán cho paraffin[10]. [10] Độ tin cậy LLM
4 ★ 720 0.22 Gán văn học tương tự Dải tại 720 cm-1 được gán cho Long chain methylene rocking (CH₂)ₙ[13]. [13] Độ tin cậy LLM
5 ★ 2955 0.21 Gán hỗ trợ bởi tài liệu Dải tại 2955 cm-1 được gán cho alkyl C-H[19]. [19] Độ tin cậy LLM
6 · 1555 0.16 - - - -
7 ★ 1732 0.14 Gán hỗ trợ bởi tài liệu Dải tại 1732 cm-1 được gán cho carbonyl[17]. [17] Độ tin cậy LLM
8 ★ 1377 0.11 Gán hỗ trợ bởi tài liệu Dải tại 1377 cm-1 được gán cho C-H asymmetric + symmetric bending[6]. [6] Độ tin cậy LLM
9 ★ 1237 0.10 Gán hỗ trợ bởi tài liệu Dải tại 1237 cm-1 được gán cho C-O single bond[16]. [16] Độ tin cậy LLM
10 ★ 1112 0.08 Gán hỗ trợ bởi tài liệu Dải tại 1112 cm-1 được gán cho C-O stretching (ether/ester/alcohol)[11][14][15]. [11], [14], [15] Độ tin cậy LLM
11 · 757 0.05 - - - -
Literature

References

1141 local KG peak-level literature source(s) kept in the candidate pool; peaks 720, 757, 1112, 1237, 1377, 1462; groups a_glucopyranoside_units, acetate, acetoxy_ester, acetyl.

No. Title DOI Page
[1] Aamouche 和 Goormaghtigh - 2008 - FTIR-ATR biosensor based on self-assembled phospho 10.3233/spe-2008-0351 -
[2] Zhao 等 - 2015 - Evaluation of Oil Yield of Oil Shale by Infrared S 10.1007/s40242-015-4364-3 -
[3] Harstad 等 - 2017 - Enhancement of beta-phase in PVDF films embedded w 10.1063/1.4973596 -
[4] Fouda 等 - 2022 - Investigate the role of fungal communities associa 10.1038/s41529-022-00296-4 -
[5] Cojocaru 等 - 2022 - Electrospun Nanofibrous Membranes Based on Citric 10.3390/polym14020294 -
[6] Cebi - 2021 - Quantification of the Geranium Essential Oil, Palm 10.3390/foods10081848 -
[7] Boonsuk 等 - 2021 - Structure-properties relationships in alkaline tre 10.1016/j.aiepr.2019.11.003 -
[8] Arya 等 - 2018 - Effect of variation of different nanofillers on st 10.1007/s11581-016-1784 -
[9] Arya 和 Sharma - 2018 - Structural, microstructural and electrochemical pr 10.1007/s11581-017-2364-7 -
[10] Al Jedani 等 - 2020 - A de-waxing methodology for scanning probe microsc 10.1039/d0ay00965b -
[11] Arya 和 Sharma - 2018 - Structural, microstructural and electrochemical pr 10.1007/s11581-017-2364-7 46
[12] Weaver 等 - 2011 - Characterization of Organics Consistent with beta- 10.1371/journal.pone.0028195 5
[13] Tu-ya 等 - 2010 - Analysis of fingerprints features of infrared spec 10.1016/j.molstruc.2010.01.008 4
[14] Suresh 等 - 2018 - Investigation of the Thermal and Dielectric Behavi 10.1007/s12633-017-9604-3 6
[15] Varol 和 Mutlu - 2023 - TGA-FTIR Analysis of Biomass Samples Based on the 10.3390/en16093674 7
[16] Saadon 和 Osman - 2023 - Effect of Drying Pretreatment on Cellulolytic Enzy 10.3390/pr11041092 6
[17] Sengupta 等 - 2019 - Graphene oxide as selective transporter of flavono 10.1016/j.saa.2019.02.029 4
[18] Weaver 等 - 2022 - Microfluidic-mediated self-assembly of phospholipi 10.1016/j.ijpharm.2021.121347 23
[19] Zhao 等 - 2015 - Evaluation of Oil Yield of Oil Shale by Infrared S 10.1007/s40242-015-4364-3 4
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): N/A

Raw spectrum without baseline correction or other processing:

Sample spectrum image
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