Migration kinetics and mechanisms of plasticizers, stabilizers at interfaces of NEPE propellant/HTPB liner/EDPM insulation

► Migration appeared in the interfaces of NEPE propellant/HTPB liner/EPDM insulation was studied. ► The migration occurred within 1 mm to the interfaces. ► The apparent migration activation energy (Ea) of mobile components is among 15 and 50 kJ/mol. ► The average diffusion coefficients were in the range of 10−19 m2 s−1 to 10−16 m2 s−1. ► The migration kinetics is affected by the property of a mobile component and the based material.