An inverse vulcanized polymer, SZIM combining Zn2+-imidazole coordination bonds and polysulfide bonds was synthesized and incorporated into bio-based Eucommia ulmoides gum (EUG) to generate EUG-SZIM-xs. The residual crystallinity of the EUG matrix synergistically interacted with the dual cross-linking networks to establish reversible deformation domains, providing EUG-SZIM-xs with quick shape memory capability at moderate temperatures. The damping properties were also investigated, and EUG-SZIM-xs displayed high tanδ values (>0.3) when the SZIM dosage was higher than 5.5 phr, which showed a positive correlation with SZIM concentration. Such good damping performance endowed the EUG-SZIM-xs with broadband low-frequency sound absorption. In addition, the dual cross-linking networks endowed the materials with reprocessability under different catalytic systems, and the 1,8-diazobicyclic[5.4.0]undeca-7-ene (DBU)-catalyzed samples exhibited better mechanical properties than EUG-SZIM-xs.
