In this work, magnetorheological elastomers (MRE) based on nickel zinc ferrite and natural rubber were prepared. Self-healing capability was employed to the MRE by peroxide induced graft polymerization between zinc thiolate and natural rubber to produce reversible ionic crosslinks that can recover the properties of the fracture materials. Evidence that reversible ionic crosslinks occurred was determined by tensile test of original and healed sample. The results revealed that the tensile strength of the MRE recovered 56% in a minute and almost 100% in 10 minutes at room temperature. The morphology of the fractured surface also showed the fracture area was recovered after the healing processed. The dynamic mechanical analysis of the MREs under cyclic loading were also examined with parallel plate rheometer.
A series of intrinsic self-healing natural rubber (NR) integrated with thermoreversible (zinc) Zn 2+ salt bonding networks was successfully fabricated via reversible ionic interaction approach. The formation of Zn 2+ salt bonding in the rubber networks was evidenced by FTIR analysis. The developed materials showed excellent self-healing capability as the properties could recover up to 76% under tensile mode and 100% under tear mode and fatigue. The crosslink density of self-healing NR-g-MAA/ZT rubber obtained from the swelling test evident that interaction between NR-g-MAA and zinc thiolate (ZT) increased with the self-healing ability of the materials. SEM images suggested the occurrence of chain diffusion between the fracture interfaces when the broken pieces were brought in contact with each other's. The reconnection of ionic salt bonding is expected to allow rearrangements of rubber segments, which turns NR-g-MAA into potential self-healing rubber materials.
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