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. Author manuscript; available in PMC: 2024 Oct 11.
Published in final edited form as: Adv Funct Mater. 2023 Apr 18;33(28):2300426. doi: 10.1002/adfm.202300426

Figure 4. Tissue-like tunable mechanical properties and durability.

Figure 4.

A. Stress-strain curves of hierarchically structured gelatin fiber hydrogels that resemble various soft tissues. B. The metastable high-entropy gelatin (MHEG) sustained the fatigue loading of 50% UTS at 1 Hz for 20 hours and did not exhibit creep behavior. C. Durability of the MHEG. Wg: fatigue energy density, Ug: toughness D. Entropy is the durability. ΔS is the estimated entropy difference between the elastin-like and collagen-like structures. ΔE is the energy required to break covalent bonds in fully crosslinked gelatin. ΔS/ΔE ≈ Wg/Ug.