Abstract
An experimental sandwich study was conducted using hydroxyl terminated polybutadiene (HTPB) binder, compacted polycrystalline ammonium perchlorate (AP) and the catalysts copper chromite (Harshaw Catalyst CuO202) and iron oxide (ferric oxide). Cinephotomacrography at a latent magnification of 2:1 was used, and the pressure range studied was 600 to 3200 psia. Catalysts were added in the binder, in the oxidizer, or at the binder-oxidizer interface. Several conclusions concerning the mechanism of catalytic activity and the behavior of composite propellants were deduced from a careful examination of the film and the associated sandwich burn rates. Comparisons were made between previous results, obtained with carboxyl terminated polybutadiene (CTPB) at 600 and 2000 psia, and the present study using HTPB.
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