How can you identify Polyurethanes from FTIR?

Quick answer

Polyurethanes 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 Polyurethanes, 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 4.9

  polyurethanes

  Effect of structure of nonisocyanate condensation polyurethanes based on benzoic acid on its susceptibility to biodegradation DOI: 10.1007/s10965-020-02353-5
• confidence 4.9

  Polyurethanes

  Branched Polyurethanes Based on Synthetic Polyhydroxybutyrate with Tunable Structure and Properties DOI: 10.3390/polym10080826
• confidence 4.9

  polyurethanes

  Waterborne anionic polyurethanes and poly(urethane-urea)s: influence of the chain extender on mechanical and adhesive properties DOI: 10.1016/S0142-9418(99)00066-5
• confidence 4.9

  Polyurethanes

  The Influence of Long-Time Storage on the Structure and Properties of Multi-Block Thermoplastic Polyurethanes Based on Poly(butylene adipate) Diol and Polycaprolactone Diol DOI: 10.3390/ma16020818
• confidence 4.9

  polyurethanes

  Influence of microstructural variations on morphology and separation properties of polybutadiene-based polyurethanes DOI: 10.1039/d1ra00764e
• confidence 4.9

  Polyurethanes

  Morales-Cerrada 等 - 2021 - Fully Bio-Based Thermosetting Polyurethanes from B DOI: 10.3390/polym13081255
• confidence 4.9

  Polyurethanes

  Synthesis and Thermomechanical Properties of Polyurethanes and Biocomposites Derived from Macauba Oil and Coconut Husk Fibers DOI: 10.3390/coatings5030527
• confidence 4.9

  polyurethanes

  Transparent sulfur-containing thermoplastic polyurethanes with polyether and polycarbonate soft segments DOI: 10.1007/s00289-017-2088-x
• confidence 4.9

  Polyurethanes

  Santiago-Medina 等 - 2018 - Polyurethanes from Kraft Lignin without Using Isoc DOI: 10.7569/JRM.2017.634172
• confidence 4.9

  Polyurethanes

  Isocyanate-Free Polyurethanes by Coreaction of Condensed Tannins with Aminated Tannins DOI: 10.7569/JRM.2016.634116