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Article Abstract
Hydroxyl-terminated polybutadiene (HTPB) is used in a variety of formulations, particularly for military and aerospace applications as a binder for energetic materials. This work investigates details of its curing process when formulated with isophorone diisocyanate (IPDI). Raman spectroscopy was used as a fast, sensitive, non-destructive technique to monitor the curing process of HTPB-IPDI. A significant feature at 777 cm was shown to grow over the course of the curing process. Ab initio calculations of the normal modes of the HTPB-IPDI dimer indicate that this feature is most likely connected to the urethane bond, which suggests that the feature at 777 cm is associated with formation of the urethane linkage as the formulation cures. Raman spectroscopy thus has potential to be used for quality assurance and other material state awareness measurements for HTPB-IPDI materials.
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