In order to optimize the application matching between HTPB propellant and EPDM insulation,the migration charac-teristics of plasticizer DOS in HTPB propellant to the EPDM insulation and its effect on the properties of insulation were studied by immersion test,contact test and composite verification.The results show that,due to the similar polarity,a large amount of DOS is easy to migrate to the insulation.The initial migration of DOS is significant and the saturated migration is about 52%.The structural parameters of rubber have no obvious influence on the migration resistance of vulcanized insulation.The dense cross-linked network of insulation can reduce the migration amount of plasticizer DOS in it.When the thickness of insulation increases,the migration rate of DOS slows down and the inflow decreases.HTPB propellant/HTPB liner/EPDM insulation composite verification results show that during the propellant curing process,DOS has migrated to the insulation and cause the mechanical properties and ablative prop-erties of insulation to decrease significantly;After the curing of propellant is finished,the mechanical properties of insulation de-crease by 55%and the line ablation rate increase by 20%;When stored at 70℃for 30 days,the mechanical properties decrease by more than 60%and the line ablation rate increase by 28%;An epoxy-based anti-migration layer between the EPDM insulation and the HTPB liner can greatly reduce the migration of plasticizer DOS from propellant to insulation,and form a good bond.
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