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EVA PE=1-9

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結果編號: 20260407070720763525700 擁有者: sjh 評論: 0
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FTIR ANALYSIS REPORT

FTIR Spectrum Analysis Report

No.: 20260407070720763525700 Date: Reported by: FTIR.fun Contact: [email protected]

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Reference library candidates

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Based on the library matches and evidence above.

Conclusion

EVA PE=1-9

Entity identified
整體信賴度
#65 Initial rank 1 Current rank 1 Library lead match 89.3%
Conclusion
  1. The alkane C–H stretching pattern (2917, 2849, 2955 cm⁻¹) is directly supported by literature assignments for PE and EVA systems [1,2].
  2. The ester carbonyl band at 1732 cm⁻¹ and the accompanying C–O modes are in excellent agreement with the spectral fingerprint of ethylene‑vinyl acetate copolymers.
  3. Amide II and III vibrations are corroborated by published band assignments in biological and polymeric amide‑containing materials [4,5].
Main limitation

Pure EVA does not normally exhibit amide bands; the amide signals at 1555 and 1237 cm⁻¹ require a secondary nitrogen‑containing component not explained by the vinyl acetate structure alone.

Evidence & interpretation
Evidence

Key evidence

資料庫主要匹配
EVA PE=1-9 #65 | match 89.3%
材料方向
Ethylene-vinyl acetate (EVA) copolymer, showing spectral features consistent with an additional amide/protein component reference library comparison identifies the sample as EVA PE=1-9, an ethylene‑vinyl acetate copolymer, with high confidence (83 %). The FTIR spectrum displays a dominant pattern of aliphatic hydrocarbon chains together with a strong ester carbonyl band, supporting the ethylene‑vinyl acetate backbone. A set of weaker but clearly resolved amide bands at 1555 and 1237 cm⁻¹ points to the presence of a secondary amide‑containing or protein‑like constituent, which is not typical for pure EVA. These amide features mirror patterns observed in chitin/protein biopolymer references, suggesting co‑formulation, bio‑based additive, or surface contamination.
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 amide_ii δch/δc_ch3
Support

Evidence supporting the conclusion

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

  1. reference library comparison identifies the sample as EVA PE=1-9, an ethylene‑vinyl acetate copolymer, with high confidence (83 %). The FTIR spectrum displays a dominant pattern of aliphatic hydrocarbon chains together with a strong ester carbonyl band, supporting the ethylene‑vinyl acetate backbone. A set of weaker but clearly resolved amide bands at 1555 and 1237 cm⁻¹ points to the presence of a secondary amide‑containing or protein‑like constituent, which is not typical for pure EVA. These amide features mirror patterns observed in chitin/protein biopolymer references, suggesting co‑formulation, bio‑based additive, or surface contamination.
  2. The alkane C–H stretching pattern (2917, 2849, 2955 cm⁻¹) is directly supported by literature assignments for PE and EVA systems [1,2].
  3. The ester carbonyl band at 1732 cm⁻¹ and the accompanying C–O modes are in excellent agreement with the spectral fingerprint of ethylene‑vinyl acetate copolymers.
  4. Amide II and III vibrations are corroborated by published band assignments in biological and polymeric amide‑containing materials [4,5].
  5. The intense absorptions at 2917, 2849 and 2955 cm⁻¹ correspond to asymmetric and symmetric C–H stretching of methylene and methyl groups in long aliphatic chains [1,2].
  6. A prominent band at 1732 cm⁻¹ is characteristic of the carbonyl stretching of ester linkages, consistent with the vinyl acetate co‑monomer [7].
  7. The group of bands between 1462 and 1377 cm⁻¹ includes CH₂ scissoring and C–H bending vibrations of methyl/methylene groups, typical of polyethylene and ethylene‑rich copolymers [6,10].
  8. Ester C–O stretching modes are apparent near 1237 and 1112 cm⁻¹, supporting the acetate structure; a weak but distinct C–O band at 1112 cm⁻¹ can be assigned to C–O single bonds [8].
  9. A medium‑intensity band at 1555 cm⁻¹ and a companion feature at 1237 cm⁻¹ match reported amide II and amide III vibrations, respectively [4,5]; their presence indicates amide‑bearing material.
  10. The low‑frequency band at 720 cm⁻¹ is attributed to CH₂ rocking of long methylene sequences, a common signature of polyethylene segments [S3, analogical].
  11. Major peak assignments include 2917: Related literature: aliphatic hydrocarbon chain pattern | Direct reference: alkyl c h; c o single bond; 2849: Related literature: amide/protein pattern; aliphatic hydrocarbon chain pattern; 1462: Related literature: aromatic ester/ketone pattern; aliphatic hydrocarbon chain pattern | Direct reference: alkyl c h; c o single bond; 720: Related literature: aliphatic hydrocarbon chain pattern | Direct reference: alkyl c h; c o single bond.
Limitations

Evidence that limits the conclusion

  • Pure EVA does not normally exhibit amide bands; the amide signals at 1555 and 1237 cm⁻¹ require a secondary nitrogen‑containing component not explained by the vinyl acetate structure alone.
  • The analogical literature evidence associating the 1555/1377/2849 cm⁻¹ triplet with chitin/protein spectra [11] underscores the multi‑component nature of the sample.
  • The origin of the amide/protein contribution remains uncertain – it could originate from a bio‑based additive, a nitrogen‑containing stabiliser, or surface contamination.
  • Part of the spectral interpretation relies on analogical literature sources; assigning the amide features to a specific protein or amide polymer requires additional confirmatory analysis.
Recommendation

Suggested next verification

  • Perform elemental analysis (e.g. CHN) to quantify nitrogen content and confirm the presence of amide/protein material.
  • Run a complementary technique such as pyrolysis‑GC‑MS or thermogravimetric analysis coupled with FTIR (TGA‑FTIR) to identify the nitrogen‑containing component.
  • Compare the sample with a reference EVA spectrum to isolate the spectral contribution of the amide/protein fraction by digital subtraction.
Peak analysis

Detected peaks and interpretation

★ = Literature-supported peak assignment.

Index Characteristic Wavenumber Absorbance Evidence One-line interpretation Citation Confidence
1 ★ 2917 1.00 文獻支援的分配 位於 2917 cm-1 的譜帶歸屬於 alkyl C-H[17]。 [17] LLM信心
2 ★ 2849 0.65 文獻支援的分配 位於 2849 cm-1 的譜帶歸屬於 alkyl C-H[17]。 [17] LLM信心
3 ★ 1462 0.33 文獻支援的分配 位於 1462 cm-1 的譜帶歸屬於 alkyl C-H[RC31]。 [RC31] LLM信心
4 ★ 720 0.22 類比文獻指派 位於 720 cm-1 的譜帶歸屬於 aliphatic hydrocarbon chain pattern[12][13][14]。 [12], [13], [14] LLM信心
5 ★ 2955 0.21 文獻支援的分配 位於 2955 cm-1 的譜帶歸屬於 asymmetric elongation vibration ch3[19]。 [19] 整體信賴度
6 ★ 1555 0.16 類比文獻指派 位於 1555 cm-1 的譜帶歸屬於 amide/protein pattern[11]。 [11] LLM信心
7 ★ 1732 0.14 文獻支援的分配 位於 1732 cm-1 的譜帶歸屬於 ester[16]。 [16] LLM信心
8 ★ 1377 0.11 文獻支援的分配 位於 1377 cm-1 的譜帶歸屬於 C-H asymmetric + symmetric bending[6]。 [6] LLM信心
9 ★ 1237 0.10 文獻支援的分配 位於 1237 cm-1 的譜帶歸屬於 C-O single bond[15]。 [15] 整體信賴度
10 ★ 1112 0.08 文獻支援的分配 位於 1112 cm-1 的譜帶歸屬於 C-O single bond[18]。 [18] 整體信賴度
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] Weaver 等 - 2011 - Characterization of Organics Consistent with beta- 10.1371/journal.pone.0028195 5
[12] Tu-ya 等 - 2010 - Analysis of fingerprints features of infrared spec 10.1016/j.molstruc.2010.01.008 4
[13] Suresh 等 - 2018 - Investigation of the Thermal and Dielectric Behavi 10.1007/s12633-017-9604-3 6
[14] Varol 和 Mutlu - 2023 - TGA-FTIR Analysis of Biomass Samples Based on the 10.3390/en16093674 7
[15] Saadon 和 Osman - 2023 - Effect of Drying Pretreatment on Cellulolytic Enzy 10.3390/pr11041092 6
[16] Sengupta 等 - 2019 - Graphene oxide as selective transporter of flavono 10.1016/j.saa.2019.02.029 4
[17] Weaver 等 - 2022 - Microfluidic-mediated self-assembly of phospholipi 10.1016/j.ijpharm.2021.121347 23
[18] Wei 等 - 2019 - Graphene Oxide Adsorption Enhanced by Attapulgite 10.3390/app9071390 4
[19] Kodaira 等 - 2023 - Simultaneous Treatment of Both Sides of the Polyme 10.3390/polym15020461 8
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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