HIGH ENERGY PROPELLANT INGREDIENT RESEARCH
Final rept. 1 Mar 1965-28 Feb 1966
OLIN MATHIESON CHEMICAL CORP NEW HAVEN CT CHEMICALS GROUP
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The thermal stability of aluminum hydride Olane 58 has been significantly improved by aging and water treatment. The effect is believed to be due to a surface coating of bayerite, AlOH3. These treated samples demonstrated thermal stabilities of less than 1 decomposition in the Taliani Test at 100 C for 8-12 hours or at 60 C for 50-75 days. Studies of the synthesis of Olane 58 by the solid LiAlH4 preparatory technique or through the addition of free radical inhibitors did not indicate the superiority of these modifications in present processes. Direct crystallization of unsolvated aluminum hydride was demonstrated from a mixed toluene-ether solution. Although the data from the Differential Scanning Calorimetry DSC scans both programmed and isothermal provide some insight into the thermal character of aluminum hydride, no meaningful correlations to Taliani Tests at 60 C and 100 C could be made for decomposition as low as 1. Conductivity studies of the LiAlH4-AlCl3 reaction under a variety of conditions indicate the formation of a AlH3 2LiAlH4 complex and chlorolane species.
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