Abstract
The migration of nitroglycerin (NG) has always been the important issue on ensuring structural integrity and operational reliability of Nitrate Ester Plasticized Polyether (NEPE) propellant/Hydroxyl-terminated Polybutadiene (HTPB) liner/Ethylene Propylene Diene Monomer (EPDM) insulation bonding system. This paper designs an innovative surface modification method to prepare EPDM insulation coated with reduced graphene oxide (RGO), which weakens the NG absorption of EPDM insulation and blocks the pathway of NG migrating into EPDM insulation. The formation mechanism and microstructure of graphene-coated layer was analyzed. The RGO-coated layer is well bonded to the HTPB liner. And its anti-migration performance to NG at different temperatures was studied. Under the same storage conditions as blank samples, RGO-coated layers can reduce the diffusion coefficient of NG by the range from 82.2% to 87.3%, and increase the diffusion activation energy of NG by 26.8%. This research provides a new strategy to inhibit NG migrating in NEPE propellant/HTPB liner/EPDM insulation bonding system.
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