How can you identify PEG from FTIR?
This page summarizes the recurring FTIR evidence reported for PEG, including the most frequent peaks, supporting functional groups, and literature-backed interpretation patterns. It is a structured evidence page, not a claim of automatic single-spectrum certainty.
Backed by 32 cited sources
Quick answer
PEG is usually reported with a recurring pattern of peaks and functional-group evidence. The most useful approach is to cross-check at least two characteristic peaks before treating it as a match, then verify whether the full spectrum still fits the same material family.
Peak interpretation
Possible materials / groups
| Grupo funcional | Evidência |
|---|---|
| Alkyl C-H | 49 |
| Hydroxyl (O-H) | 34 |
| Methacrylate | 31 |
| Acetate | 31 |
| C-O single bond | 29 |
| Methoxy (OCH3) | 27 |
| Carbonyl (C=O) | 17 |
| Ester | 12 |
Spectrum logic
The logic here is evidence aggregation: repeated literature mentions of PEG, repeated peak positions, and repeated functional-group associations. A strong material hypothesis should still be supported by multiple peaks that agree with each other, not by one headline band alone.
Real-world usage
This page is designed for polymer identification, incoming-material QC, unknown plastic analysis, recycled-content review, and literature-backed interpretation of reference spectra.
Common mistakes
- Calling a material match too early because one famous peak is present.
- Ignoring sample prep, fillers, oxidation, water, or additives that can change the apparent pattern.
- Using literature evidence without checking whether your own sampling mode and spectrum quality are comparable.
Verification advice
Use DSC, GC-MS, or TGA to validate the material hypothesis when the peak pattern is ambiguous or mixed.
Literature behind this page
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Synthesis and investigation of desalinating, antibacterial, and mechanical properties of tetraethylorthosilicate crosslinked chitosan/polyethylene glycol (PEG‐300) membranes for reverse osmosis DOI: 10.1002/app.48870 -
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Edun 等 - 2021 - Does liquid-liquid phase separation drive peptide DOI: 10.1039/d0sc04993j -
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Graphene oxide and its derivatives as promising In-vitro bio-imaging platforms DOI: 10.1038/s41598-020-75090-w -
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Modification of Thin Film Composite Pressure Retarded Osmosis Membrane by Polyethylene Glycol with Different Molecular Weights DOI: 10.3390/membranes12030282 -
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Kong 等 - 2017 - Preparation and thermal properties of crosslinked DOI: 10.1039/c7ra04504b -
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Kumar 等 - 2020 - Polyethylene Glycol (PEG) Modified Porous Ca-5(PO4 DOI: 10.3390/coatings10060538 -
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Kumar 等 - 2022 - Flexible Temperature Sensor Utilizing MWCNT Doped DOI: 10.3390/mi13020197 -
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FTIR and Raman Characterization of TiO2 Nanoparticles Coated with Polyethylene Glycol as Carrier for 2-Methoxyestradiol DOI: 10.3390/app7010049 -
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Mahmud 等 - 2018 - Influence of Poly (Ethylene Glycol) on the Charact DOI: 10.17576/jsm-2018-4706-14 -
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Studies on Chemical IR Images of Poly(hydroxybutyrate–co–hydroxyhexanoate)/ Poly(ethylene glycol) Blends and Two-Dimensional Correlation Spectroscopy DOI: 10.3390/polym11030507
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