Mechanical Properties of Self-Recovery Tough Gels with Permanent and Reversible Crosslinks

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Other Title
  • 自己回復性高強度ゲルの力学物性
  • ジコ カイフクセイ コウキョウド ゲル ノ リキガク ブッセイ

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Description

We introduce our recent work on linear viscoelasticity, large deformation behaviour and fracture properties of self-recovery dual crosslink gels having covalent and reversible crosslinks. The breakage of transient crosslinks dissipates strain energy and enhances the fracture toughness and extensibility of the gels. We have developed model “dual cross-link” gels, having permanent and reversible crosslinks simultaneously. The PVA dual crosslink gels are good model systems to investigate quantitatively the relationship between the breaking/healing dynamics of the breakable crosslinks and the macroscopic mechanical properties because they have a well-defined life time of the reversible bonds observed by linear rheology. We have performed various strain history tensile measurements, such as stress relaxation, continuous loading, and loading/unloading tests, to separate the effect of the breaking and healing of the reversible crosslinks on macroscopic stress. Also we have developed a physical model for the stress-strain relation and determined the breaking/healing time of the physical crosslinks.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 72 (10), 597-605, 2015

    The Society of Polymer Science, Japan

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