How can you identify polyamide from FTIR?
This page summarizes the recurring FTIR evidence reported for polyamide, 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 29 cited sources
Quick answer
polyamide 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
| Funktionell grupp | Bevis |
|---|---|
| Amide | 39 |
| Carbonyl (C=O) | 22 |
| Alkyl C-H | 20 |
| Methacrylate | 18 |
| Acetate | 18 |
| N h | 14 |
| Ketone | 13 |
| Carboxyl (COOH) | 13 |
Spectrum logic
The logic here is evidence aggregation: repeated literature mentions of polyamide, 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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förtroende 6,1
polyamide
Change of chemical composition and hydrogen bonding behavior due to chlorination of crosslinked polyamide membranes DOI: 10.1002/app.25657 -
förtroende 6,1
polyamide
Microplastics Detected in Sediments and Rocks Substrate of Marine Areas with Ghost Nets DOI: 10.3390/jmse11040750 -
förtroende 6,1
polyamide
Polishing Step Purification of High-Strength Wastewaters by Nanofiltration and Reverse Osmosis DOI: 10.3390/membranes6010019 -
förtroende 4,9
Polyamide
Salehi-Mobarakeh 等 - 2013 - Polyamide grafting onto ethylene-vinyl alcohol cop DOI: 10.1515/polyeng-2013-0104 -
förtroende 4,9
Polyamide
Domingos 等 - 2013 - Monitoring the Degradation of Polyamide 11 (PA-11) DOI: 10.1590/S0104-14282012005000070 -
förtroende 4,9
polyamide
Homogeneous nucleation in polyamide 66, a two-stage process as revealed by combined nanocalorimetry and IR spectroscopy DOI: 10.1007/s00396-022-04980-4 -
förtroende 4,9
Polyamide
Ngo 等 - 2020 - Improvement of Hydrophilicity for Polyamide Compos DOI: 10.1155/2020/6641225 -
förtroende 4,9
Polyamide
Silva 等 - 2021 - Digital Sublimation Printing on Knitted Polyamide DOI: 10.3390/polym13121969 -
förtroende 4,9
Polyamide
Removal of Sulfadiazine by Polyamide Nanofiltration Membranes: Measurement, Modeling, and Mechanisms DOI: 10.3390/membranes11020104 -
förtroende 4,1
Polyamide
Aritonang 等 - 2019 - Grafting of Oleic Acid On Cyclic Natural Rubber Re DOI: 10.13005/ojc/350119
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