How can you identify polyimide from FTIR?
This page summarizes the recurring FTIR evidence reported for polyimide, 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 13 cited sources
Quick answer
polyimide 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 |
|---|---|
| Carbonyl (C=O) | 21 |
| Amide | 17 |
| Alkyl C-H | 12 |
| Methacrylate | 10 |
| Carboxyl (COOH) | 10 |
| Acetate | 10 |
| Secondary amine | 8 |
| C n single bond | 8 |
Spectrum logic
The logic here is evidence aggregation: repeated literature mentions of polyimide, 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
-
confidence 6.1
polyimide
Yang 等 - 2016 - Comparison of different methods for determining th DOI: 10.1007/s10118-016-1749-9. -
confidence 6.1
polyimide
Thur 等 - 2019 - Bipyridine-based UiO-67 as novel filler in mixed-m DOI: 10.1016/j.progpolymsci.2008.12.004. -
confidence 4.9
polyimide
Electroactive polyimide with oligoaniline in the main chain via oxidative coupling polymerization DOI: 10.1016/j.eurpolymj.2007.03.048 -
confidence 4.9
Polyimide
Spectroscopic Stuides on the Liquid Crystal Alignment Mechanism for Polarized UV-Exposed Organosoluble 6FDA-TFMB Polyimide Films DOI: 10.1080/10587250108028259 -
confidence 4.9
Polyimide
Preparation of Poly(amic acid) and Polyimide via Microwave‐Assisted Polycondensation of Aromatic Dianhydrides and Diamines DOI: 10.1002/masy.200850120 -
confidence 4.9
polyimide
Mathakari 等 - 2009 - Surface and structural changes in polyimide by 100 DOI: 10.1016/j.surfcoat.2009.02.078 -
confidence 4.9
Polyimide
Preparation of Solution Blown Polyamic Acid Nanofibers and Their Imidization into Polyimide Nanofiber Mats DOI: 10.3390/nano7110395 -
confidence 4.9
Polyimide
SPEEK/Polyimide Blends for Proton Conductive MembranesPresented at the 1st CARISMA Conference, Progress MEA 2008, La Grande Motte, 21st–24th September 2008. DOI: 10.1002/fuce.200800121 -
confidence 4.9
polyimide
Diffusion and molecular interactions in a methanol/polyimide system probed by coupling time-resolved FTIR spectroscopy with gravimetric measurements DOI: 10.3389/fchem.2014.00002 -
confidence 4.9
polyimide
Dopamine@Nanodiamond as novel reinforcing nanofillers for polyimide with enhanced thermal, mechanical and wear resistance performance DOI: 10.1039/c7ra10688b
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