SynopsisThe diffusion of solutions of ethyl centralite (EC), dibutylphthalate (DBP), an-. dinitrotoluene (DNT) into a nitrocellulose (NC) propellant is investigated. DBP and EC penetrate the propellant in a way consistent with Case I1 diffusion. The diffusion of DNT solutions is Fickian. The apparent activation energy for Case I1 diffusion is 62 kJ/mol for DBP and 66 kJ/mol for EC.Changes to coating solvent polarity have little effect on DNT and DBP penetration and merely alter the rate, not the mechanism, of EC diffusion into the propellant.
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