Modern solid propellants are highly filled composite materials. The essential ingredients of a composite propellant are a crosslinked binder, a thermoset polymer and an oxidizer. Furthermore, most propellant formulations contain a stabilizer, ballistic modifiers, high energy fuel additives, a wetting agent, plasticizers and other additives to adjust physical properties. In this case the crosslinking density of the polyurethane binder plays an important role in consideration of the performance and quality of the propellant material. Modern NIR-Spectroscopy is used to monitor the crosslinking reaction.
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