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 22 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
| Functional group | Evidence |
|---|---|
| Alkyl C-H | 24 |
| Methacrylate | 20 |
| Acetate | 20 |
| Hydroxyl (O-H) | 20 |
| C-O single bond | 18 |
| Methoxy (OCH3) | 16 |
| Carbonyl (C=O) | 8 |
| Amide | 8 |
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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confidence 7.1
PEG
Preparation and characterization of plasticized palm-based polyurethane solid polymer electrolyte DOI: 10.1063/1.4858749 -
confidence 7.1
PEG
Synthesis, characterization, and crystallization behaviors of poly(D-lactic acid)-based triblock copolymer DOI: 10.1038/s41598-020-60458-9 -
confidence 7.1
PEG
Edun 等 - 2021 - Does liquid-liquid phase separation drive peptide DOI: 10.1039/d0sc04993j -
confidence 5.9
PEG
Formulation and Characterization of Fe3O4@PEG Nanoparticles Loaded Sorafenib; Molecular Studies and Evaluation of Cytotoxicity in Liver Cancer Cell Lines DOI: 10.3390/polym15040971 -
confidence 5.9
PEG
Impact of process stress on protein stability in highly-loaded solid protein/PEG formulations from small-scale melt extrusion DOI: 10.1016/j.ijpx.2022.100154 -
confidence 5.9
PEG
Effect of Polymers (PEG and PVP) on Sol‐Gel Synthesis of Microsized Zinc Oxide DOI: 10.1155/2013/362175 -
confidence 5.9
PEG
Antiaging Property and Mechanism of Phase‐Change Asphalt with PEG as an Additive DOI: 10.1155/2020/7598049 -
confidence 5.1
PEG
A Comparison of the Effect of Cellulose Nanocrystals (CNCs) and Polyethylene Glycol (PEG) as Additives in Ultrafiltration Membranes (PES-UF): Characterization and Performance DOI: 10.3390/polym15122636 -
confidence 5.1
PEG
Hybrid Hydrogels Based on Polyethylene Glycol Bioconjugated with Silylated‑Amyloidogenic Peptides DOI: 10.21577/0103-5053.20200059 -
confidence 5.1
PEG
Polyethylene Glycol (PEG) Modified Porous Ca5(PO4)2SiO4 Bioceramics: Structural, Morphologic and Bioactivity Analysis DOI: 10.3390/coatings10060538
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