How does PEG usually appear in FTIR?

Alkyl C-H, Hydroxyl (O-H), Methacrylate, Acetate, C-O single bond, Methoxy (OCH3), Carbonyl (C=O), Ester. This page summarizes literature-backed material evidence, not a stand-alone spectroscopic verdict.

FTIR MATERIAL QUESTION

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

Peak (cm⁻¹)	Evidence count
1650	11
1342	11
1100	10
1600	9
1542	8
1717	8
1720	7
1098	7

Possible materials / groups

Funktionel gruppe	Bevis
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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