DEVELOPMENT OF FLEXIBLE POLYMERS AS THERMAL INSULATION IN SOLID-PROPELLANT ROCKET MOTORS.
Final summary rept., 24 June 60-23 June 63,
ATLANTIC RESEARCH CORP ALEXANDRIA VA
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The objective of this program was to develop flexible polymers which, when suitably filled, would serve as effective case insulation in endburning, solid-propellant rocket motors. Resin systems selected for study were the epoxies, phenolics, polyurethanes, polyesters, furans and melamines. Flexible polymers of all six systems were prepared generally by using internal type plasticizers or modifiers, and to a much lesser extent, by external plasticizers. The insulation performance of promising filled resins were determined by the oxyacetylene torch and static motor firing tests. Mechanical properties, aging properties, and the effect of various fillers and resin composition on insulation performance were determined for a number of the more promising resins. The best insulation developed on the basis of char rate and density was a modified epoxy resin filled with 40 long-fiber asbestos. The resin is prepared from Epon 828, tetrahydrophthalic anhydride, castor oil 1001.07 1.49. Author