How can you identify polyester from FTIR?
This page summarizes the recurring FTIR evidence reported for polyester, 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 26 cited sources
Quick answer
polyester 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 | 38 |
| Carbonyl (C=O) | 28 |
| Methacrylate | 25 |
| Acetate | 25 |
| Ester | 20 |
| Amide | 18 |
| Aromatic ring | 18 |
| Methoxy (OCH3) | 16 |
Spectrum logic
The logic here is evidence aggregation: repeated literature mentions of polyester, 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 6.1
polyester
Thermal Degradation Mechanism of a Thermostable Polyester Stabilized with an Open-Cage Oligomeric Silsesquioxane DOI: 10.3390/ma11010022 -
confidence 6.1
polyester
Dalmau-Soler 等 - 2022 - Microplastics throughout a tap water supply networ DOI: 10.1111/wej.12766 -
confidence 6.1
polyester
Fibers spreading worldwide: Microplastics and other anthropogenic litter in an Arctic freshwater lake DOI: 10.1016/j.scitotenv.2020.137904 -
confidence 6.1
polyester
Schwinghammer 等 - 2021 - Determination of large microplastics wet-sieving DOI: 10.2166/wst.2020.582 -
confidence 4.9
Polyester
Terraza 等 - 2018 - Preparation of CuONPs@PVDFNon-Woven Polyester Com DOI: 10.3390/polym10080862 -
confidence 4.9
polyester
Magnetic polyester bis-MPA dendron nanohybrid demulsifier can effectively break water-in-crude oil emulsions DOI: 10.1016/j.jmrt.2020.09.074 -
confidence 4.9
Polyester
Self-Assembled Polyester Dendrimer/Cellulose Nanofibril Hydrogels with Extraordinary Antibacterial Activity DOI: 10.3390/pharmaceutics12121139 -
confidence 4.9
Polyester
Bio-Based Phosphate-Containing Polyester for Improvement of Fire Reaction in Wooden Particleboard DOI: 10.3390/polym15051093 -
confidence 4.9
Polyester
Microstructure Changes in Polyester Polyurethane upon Thermal and Humid Aging DOI: 10.3390/polym8050197 -
confidence 4.1
polyester
Bahadi 等 - 2021 - Synthesis and Characterization of Green Biodegrada DOI: 10.33263/BRIAC116.1435914371
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