Stabilization of Cure Rates of Diisocyanates with Hydroxy-Terminated Polybutadiene Binders
Final technical rept. Dec 1971-Mar 1973
ALABAMA UNIV IN HUNTSVILLE
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The purpose of the study was to define the catalytic effect of various propellant ingredients or potential additives on the rate of reaction of a model alcohol-isocyanate reaction. The object was to define those species and factors which contribute to a short pot-life in hydroxy-terminated polybutadiene HTPB bound propellants and to test various means of sequestering these species or, alternatively, of removing them. Studies of the effects of various catalysts on the reaction between alkyl isocyanates and alcohols have been carried out. In general, substances soluble in the reactants are more effective catalysts with organoiron derivatives being the most effective of those studied. The reaction was found to be light-assisted and ferrocene was shown to be a catalyst both in the presence of and in the absence of light. Ferrocene and its derivatives are degraded by light in the presence of air and by ammonium perchlorate.
- Organic Chemistry
- Elastomers and Rubber
- Solid Rocket Propellants