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Curing Mechanism of Hydroxyl-Terminated Polybutadiene (HTPB) Formulated with Isophorone Diisocyanate (IPDI) as
Shane M Drake1, Daniel J Pendleton1, Caleb D Potter1
1Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, USA.
Applied Spectroscopy
|July 25, 2025
Summary
Raman spectroscopy effectively monitors the curing of hydroxyl-terminated polybutadiene (HTPB) with isophorone diisocyanate (IPDI). A key spectral feature indicates urethane bond formation, enabling material quality assurance.
Area of Science:
- Polymer Chemistry
- Materials Science
- Spectroscopy
Background:
- Hydroxyl-terminated polybutadiene (HTPB) is a crucial binder in energetic materials for military and aerospace applications.
- Understanding the curing process of HTPB-based formulations is vital for material performance and reliability.
Purpose of the Study:
- To investigate the curing process of HTPB formulated with isophorone diisocyanate (IPDI).
- To identify a spectroscopic marker for monitoring urethane bond formation during curing.
Main Methods:
- Utilized Raman spectroscopy as a non-destructive technique to monitor the HTPB-IPDI curing process in real-time.
- Performed ab initio calculations to analyze normal modes and assign spectral features.
Main Results:
- Observed a significant spectral feature at 777 cm-1 that increased during the curing process.
- Correlated the 777 cm-1 feature with the formation of urethane linkages through computational analysis.
Conclusions:
- Raman spectroscopy is a sensitive method for tracking HTPB-IPDI curing.
- The identified spectral feature at 777 cm-1 serves as an indicator of urethane bond formation.
- Raman spectroscopy shows potential for quality assurance and material state monitoring in HTPB-IPDI systems.
