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<p>This study is inspired by the exquisite multi-level structure of trabecular bone, and innovatively proposes a design and preparation strategy for nonlinear oriented (irregular arrangement of microstructure) reinforced hydrogels with micro-zone limitation (precise regulation of mechanical property in mirco-zone), achieving precise regulation of the internal structure of hydrogels. Based on the force-bearing model of the porous structure of trabecular bone, this study uses polyvinyl alcohol (PVA) as the raw material to successfully prepare a porous hydrogel framework (PHF) at the macroscopic scale. The framework is composed of multiple tricorn micro-zone (TMZ) units, laying a foundation for subsequent structural regulation. At the mesoscopic level, with the aid of mechanical training methods, nonlinear oriented fibers along the contour direction spontaneously form inside the TMZ units, with the fiber orientation degree reaching 0.9788. The correctness of this force-bearing mode is verified through finite element mechanical simulation. At the microscopic level, point-by-point scanning of TMZ units using the synchrotron radiation light source confirms that the maximum molecular chain orientation degree reaches 86.5%, and the crystallinity reaches up to 50.4%. According to mechanical property tests, the hydrogel with outstanding mechanical characteristics is endowed by the non-linear orientation structure. The tensile breaking strength of this hydrogel can reach up to 8.83 ± 0.62&#xa0;MPa, and the compressive strength at 80% strain reaches 6.91 ± 0.48&#xa0;MPa, achieving a significant improvement compared with the regular hydrogel system, and conceptually opening up new ideas for the hydrogel field of structural mechanics enhancement.</p>

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The nonlinear oriented reinforced hydrogel with micro-zone limitation inspired by trabecular bone structure

  • 期刊论文

  • 发表日期：

    2025年11月26日

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  • Chi Zhang,
  • Luyao Wang,
  • Haoyue Guo,
  • Yaning Wei,
  • Jin Zhao,
  • Xubo Yuan

摘要

This study is inspired by the exquisite multi-level structure of trabecular bone, and innovatively proposes a design and preparation strategy for nonlinear oriented (irregular arrangement of microstructure) reinforced hydrogels with micro-zone limitation (precise regulation of mechanical property in mirco-zone), achieving precise regulation of the internal structure of hydrogels. Based on the force-bearing model of the porous structure of trabecular bone, this study uses polyvinyl alcohol (PVA) as the raw material to successfully prepare a porous hydrogel framework (PHF) at the macroscopic scale. The framework is composed of multiple tricorn micro-zone (TMZ) units, laying a foundation for subsequent structural regulation. At the mesoscopic level, with the aid of mechanical training methods, nonlinear oriented fibers along the contour direction spontaneously form inside the TMZ units, with the fiber orientation degree reaching 0.9788. The correctness of this force-bearing mode is verified through finite element mechanical simulation. At the microscopic level, point-by-point scanning of TMZ units using the synchrotron radiation light source confirms that the maximum molecular chain orientation degree reaches 86.5%, and the crystallinity reaches up to 50.4%. According to mechanical property tests, the hydrogel with outstanding mechanical characteristics is endowed by the non-linear orientation structure. The tensile breaking strength of this hydrogel can reach up to 8.83 ± 0.62 MPa, and the compressive strength at 80% strain reaches 6.91 ± 0.48 MPa, achieving a significant improvement compared with the regular hydrogel system, and conceptually opening up new ideas for the hydrogel field of structural mechanics enhancement.