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Accelerated aging experiments of 3,3‐bis(azidomethyl)oxetane (BAMO) and tetrahydrofuran (THF) copolymers (molar ratio 1 : 1, marked as PBT prepolymer) and PBT elastomer at elevated temperatures were performed to explore the aging mechanism of PBT energetic elastomer during long‐term storage. The evolution of functional groups, plasticizer content, element chemical state and crosslinking density were...