Polyethylene (PE)
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Polyethylene (PE)
Material direction: Polyethylene
Sample & Measurement Parameters
Identification Result
90%The sample is identified as polyethylene (PE) with possible minor vinyl acetate comonomer content (EVA) or oxidation. The strong aliphatic hydrocarbon backbone is clearly evident from the dominant C-H stretching bands at ~2915 and 2849 cm⁻¹, CH₂ bending near 1464 cm⁻¹, and CH₂ rocking at ~718 cm⁻¹. Additional absorption bands at ~1746, 1085, and 1004 cm⁻¹ indicate the presence of carbonyl and ether functional groups, consistent with a small amount of vinyl acetate (as in EVA) or surface oxidation. A weak band at ~1607 cm⁻¹ may arise from an aromatic additive or contaminant. This interpretation is supported by the high library match to Polyethylene (PE) and the consistent pattern of top‑15 library hits, which include EVA copolymers FTIR In-Depth Interpretation was not selected for this task, so this section shows the library-search result only and no deep AI interpretation was run.
Detailed interpretation
- Top library match: Polyethylene (PE) #548
- Direct literature assignments for some additional bands (e.g., Cl, Si–O, aromatic structures) are chemically incompatible with polyethylene; these are likely artifacts of the broad literature search rather than genuine sample constituents.
- The carbonyl and ether bands would not be expected for a pure, unmodified polyethylene; however, they are consistent with the EVA‑type copolymers that appear among the top library hits.
- The exact nature and concentration of the oxygenated functionality (vinyl acetate vs. oxidation products) cannot be determined from FTIR alone.
- The source of the weak aromatic absorption remains unidentified; it could stem from a packaging additive or atmospheric contamination.
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 | · | 2915 | 0.98 | - | - | - |
| 2 | · | 2849 | 0.70 | - | - | - |
| 3 | · | 1464 | 0.35 | - | - | - |
| 4 | · | 718 | 0.28 | - | - | - |
| 5 | · | 406 | 0.08 | - | - | - |
| 6 | · | 3322 | 0.05 | - | - | - |
| 7 | · | 3271 | 0.04 | - | - | - |
| 8 | · | 1328 | 0.04 | - | - | - |
| 9 | · | 3193 | 0.04 | - | - | - |
| 10 | · | 3225 | 0.04 | - | - | - |
| 11 | · | 1004 | 0.04 | - | - | - |
| 12 | · | 1607 | 0.04 | - | - | - |
| 13 | · | 2651 | 0.04 | - | - | - |
| 14 | · | 1175 | 0.04 | - | - | - |
| 15 | · | 3991 | 0.04 | - | - | - |
| 16 | · | 1085 | 0.03 | - | - | - |
| 17 | · | 3347 | 0.03 | - | - | - |
| 18 | · | 1216 | 0.03 | - | - | - |
| 19 | · | 3399 | 0.03 | - | - | - |
| 20 | · | 1746 | 0.01 | - | - | - |
Appendix — Raw Spectrum
Comments and follow-up evidence
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