How can you identify polyimide from FTIR?

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

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

  Purushothaman 和 Bilal - 2014 - Development and characterization of homo, co and t DOI: 10.1515/polyeng-2013-0167
• 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

  Chao 等 - 2007 - Electroactive polyimide with oligoaniline in the m DOI: 10.1016/j.eurpolymj.2007.03.048
• 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

  Surface and structural changes in polyimide by 100 MeV Ag7+ ion irradiation DOI: 10.1016/j.surfcoat.2009.02.078
• confidence 4.9

  polyimide

  Serbezeanu 等 - 2016 - Phosphorus-containing polyimide fibers and their t DOI: 10.1039/c6ra06497c
• confidence 4.1

  polyimide

  Preparation, Characterization and Thermal Degradation of Polyimide (4-APS/BTDA)/SiO2 Composite Films DOI: 10.3390/ijms13044860
• confidence 4.1

  polyimide

  Feng 等 - 2019 - Flame Inhibition and Charring Effect of Aromatic P DOI: 10.3390/polym11010074
• confidence 4.1

  polyimide

  Preparation of Solution Blown Polyamic Acid Nanofibers and Their Imidization into Polyimide Nanofiber Mats DOI: 10.3390/nano7110395