FT-NIR Spectroscopy executes a rapid and non-destructive resolution of NCO% in Polyurethanes.
Measurement Made Simple
Polyurethane polymers are implemented in the production of foams, inks, adhesives, synthetic fibers, and plastics.
Polyurethane polymers are typically, and most frequently, constituted following the reaction of a polyol with an isocyanate. Through measurement of the NCO%, it is possible to monitor the reaction's developments.
Polyurethane polymerization reaction
FT-NIR is an appealing substitute because it permits the execution of a quick, non-destructive verification of NCO% in polyurethanes. Each sample can be examined in under a minute, and the trial can be undertaken by an operative without an analytical background.
The FT-NIR methodology will conventionally display a reproducibility not dissimilar to established laboratory techniques, but with far superior repeatability and robustness.
This study illustrates the implementation of an ABB FT-NIR instrument (PTPA2000-260) for rapid determination of NCO% in polyurethane polymer.
- Instrument: FTPA2000-260
- Detector: InGaAs, 2.6 µm TEC
- Sampling technique: transflectance probe
- Analysis temperature: 65 to 70 °C (149 to 158 °F)
- Path length: 10 mm
- Number of scans: 128
- Resolution: 16 cm-1
- Chemometrics model: Partial Least Squares (PLS)
Calibration NCO% plots: actual vs predicted
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The research undertaken by ABB has demonstrated the feasibility of online monitoring of NCO% by NIR.
The experiment was performed utilizing a transflectance probe. However, for an industrial function, the use of a transmission probe or a flow through cell is recommended for greater repeatability and a more simple cleaning process.
This information has been sourced, reviewed and adapted from materials provided by ABB Measurement & Analytics - Analytical Measurement Products.
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