Iranian Scientific Association of Energetic Materials

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In this paper, diffusion and migration of Dioctyl sebacate (DOS) and Dioctyl phetalate (DOP) plasticizers at the interface of propellant and insulation as well as different distances from the interface in composite solid propellant based on HTPB / AP using both experimental and modeling have been investigated. Solid composite propellant and Nitrile Butadiene Rubber (NBR) insulation containing DOS and DOP plasticizers respectly were used to investigate the plasticizer diffusion phenomenon. Matlab software was used for the modeling and simulation process. In addition, the results of the simulation and results obtained from the analysis by gas chromatography (GC) were compared. The samples were aged at ambient temperature and 80ºC, examined by Shore A hardness tests .Finally, the scanning electron microscopy (SEM) was performed to imaged sample surfaces.

Keywords: composite solid propellant, plasticizer, diffusion, fick’s low, migration.

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