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Metal-Coordinated Dynamics and Viscoelastic Properties of Double-Network Hydrogels

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Title: Metal-Coordinated Dynamics and Viscoelastic Properties of Double-Network Hydrogels
Authors: Zhu, Shilei Browse this author
Wang, Yan Browse this author
Wang, Zhe Browse this author
Chen, Lin Browse this author
Zhu, Fengbo Browse this author
Ye, Yanan Browse this author
Zheng, Yong Browse this author
Yu, Wenwen Browse this author
Zheng, Qiang Browse this author
Keywords: metal-coordinated dynamics
viscoelastic properties
double-network gels
Issue Date: 4-Feb-2023
Publisher: MDPI
Journal Title: Gels
Volume: 9
Issue: 2
Start Page: 145
Publisher DOI: 10.3390/gels9020145
Abstract: Biological soft tissues are intrinsically viscoelastic materials which play a significant role in affecting the activity of cells. As potential artificial alternatives, double-network (DN) gels, however, are pure elastic and mechanically time independent. The viscoelasticization of DN gels is an urgent challenge in enabling DN gels to be used for advanced development of biomaterial applications. Herein, we demonstrate a simple approach to regulate the viscoelasticity of tough double-network (DN) hydrogels by forming sulfonate-metal coordination. Owing to the dynamic nature of the coordination bonds, the resultant hydrogels possess highly viscoelastic, mechanical time-dependent, and self-recovery properties. Rheological measurements are performed to investigate the linear dynamic mechanical behavior at small strains. The tensile tests and cyclic tensile tests are also systematically performed to evaluate the rate-dependent large deformation mechanical behaviors and energy dissipation behaviors of various ion-loaded DN hydrogels. It has been revealed based on the systematic analysis that robust strong sulfonate-Zr4+ coordination interactions not only serve as dynamic crosslinks imparting viscoelastic rate-dependent mechanical performances, but also strongly affect the relative strength of the first PAMPS network, thereby increasing the yielding stress sigma(y) and the fracture stress at break sigma(b) and reducing the stretch ratio at break lambda(b). It is envisioned that the viscoelasticization of DN gels enables versatile applications in the biomedical and engineering fields.
Type: article
Appears in Collections:化学反応創成研究拠点:ICReDD (Institute for Chemical Reaction Design and Discovery : ICReDD) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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