How can you identify Polyurethane from FTIR?

Quick answer

Polyurethane 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 Polyurethane, 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

  polyurethane

  Preparation and characterization of polyvinyl alcohol hydrogels crosslinked by biodegradable polyurethane for tissue engineering of cartilage DOI: 10.1016/j.msec.2010.02.017
• confidence 4.9

  polyurethane

  Two-component waterborne polyurethane: Curing process study using dynamic in situ IR spectroscopy DOI: 10.1016/j.polymertesting.2018.05.021
• confidence 4.9

  polyurethane

  Preparation of one-shot and two-shot method of semi-rigid polyurethane film based on functionalized liquid natural rubber DOI: 10.1063/1.5047200
• confidence 4.9

  polyurethane

  Bromo-substituted blocked hexamethylene diisocyanate adduct: synthesis, characterization and application toward polyurethane coating DOI: 10.1080/10601325.2020.1845569
• confidence 4.9

  polyurethane

  The effect of isocyanate structure on ionic conductivity of waste cooking oil based polyurethane solid polymer electrolyte DOI: 10.1063/1.5002441
• confidence 4.9

  polyurethane

  Silk‐inspired polyurethane containing GlyAlaGlyAla tetrapeptide. II. physical properties and structure DOI: 10.1002/app.39185
• confidence 4.9

  Polyurethane

  Comparative Study of Aromatic and Cycloaliphatic Isocyanate Effects on Physico-Chemical Properties of Bio-Based Polyurethane Acrylate Coatings DOI: 10.3390/polym12071494
• confidence 4.9

  Polyurethane

  Additive Manufacturing Polyurethane Acrylate via Stereolithography for 3D Structure Polymer Electrolyte Application DOI: 10.3390/gels8090589
• confidence 4.9

  Polyurethane

  Time-Dependent Morphology Development in a Segmented Polyurethane with Monodisperse Hard Segments Based on 1,4-Phenylene Diisocyanate DOI: 10.1021/ma051063a
• confidence 4.9

  Polyurethane

  Fourrier Transform Infrared and Gel Permeation Chromatography Evaluation to Prepared Polyurethane Paint from Polyol Palm Oil Based DOI: 10.4028/www.scientific.net/AMM.525.162