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Super Bulk and Interfacial Toughness of Physically Crosslinked Double-Network Hydrogels

机译：物理交联的双网络水凝胶的超大体积和界面韧性

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摘要

Conventional design wisdom prevents both bulk and interfacial toughness to be presented in the same hydrogel, because the bulk properties of hydrogels are usually different from the interfacial properties of the same hydrogels on solid surfaces. Here, a fully-physically-linked agar (the first network)/poly(N-hydroxyethyl acrylamide) (pHEAA, the second network), where both networks are physically crosslinked via hydrogen bonds, is designed and synthesized. Bulk agar/pHEAA hydrogels exhibit high mechanical properties (2.6 MPa tensile stress, 8.0 tensile strain, 8000 J m(-2) tearing energy, 1.62 MJ m(-3) energy dissipation), high self-recovery without any external stimuli (62%/30% toughness/stiffness recovery), and self-healing property. More impressively, without any surface modification, agar/pHEAA hydrogels can be easily and physically anchored onto different nonporous solid substrates of glass, titanium, aluminum, and ceramics to produce superadhesive hydrogel-solid interfaces (i.e., high interfacial toughness of 2000-7000 J m(-2)). Comparison of as-prepared and swollen gels in water and hydrogen-bond-breaking solvents reveals that strong bulk toughness provides a structural basis for strong interfacial toughness, and both high toughness mainly stem from cooperative hydrogen bonds between and within two networks and between two networks and solid substrates. This work demonstrates a new gel system to achieve superhigh bulk and interfacial toughness on nonporous solid surfaces.
机译：常规的设计原则阻止了在同一水凝胶中同时出现体积和界面韧性，因为水凝胶的体积性质通常不同于相同水凝胶在固体表面上的界面性质。在此，设计并合成了完全物理连接的琼脂（第一个网络）/聚（N-羟乙基丙烯酰胺）（pHEAA，第二个网络），其中两个网络都通过氢键物理交联。散装琼脂/ pHEAA水凝胶显示出高机械性能（2.6 MPa拉应力，8.0拉伸应变，8000 J m（-2）的撕裂能，1.62 MJ m（-3）的能量耗散），无任何外部刺激的高自我恢复性（62 ％/ 30％的韧性/刚度恢复）和自我修复性能。更令人印象深刻的是，无需进行任何表面修饰，琼脂/ pHEAA水凝胶可以轻松，物理地锚固在玻璃，钛，铝和陶瓷的不同无孔固体基质上，以产生超粘合水凝胶-固体界面（即2000-7000 J的高界面韧性） m（-2））。比较水和氢键断裂溶剂中制备的凝胶和溶胀的凝胶，发现强的本体韧性为强的界面韧性提供了结构基础，并且两种高韧性主要源于两个网络之间和内部以及两个网络之间的协同氢键和固体基材。这项工作证明了一种新的凝胶体系，可以在无孔固体表面上实现超高的膨松度和界面韧性。

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  • 来源
    《Advanced Functional Materials》 |2017年第44期|1703086.1-1703086.10|共10页
  • 作者

    Chen Hong; Liu Yonglan; Ren Baiping; Zhang Yanxian; Ma Jie; Xu Lijian; Chen Qiang; Zheng Jie;

  • 作者单位

    Hunan Univ Technol, Coll Life Sci & Chem, Zhuzhou 412007, Peoples R China|Univ Akron, Dept Chem & Biomol Engn, Akron, OH 44325 USA;

    Univ Akron, Dept Chem & Biomol Engn, Akron, OH 44325 USA;

    Univ Akron, Dept Chem & Biomol Engn, Akron, OH 44325 USA;

    Univ Akron, Dept Chem & Biomol Engn, Akron, OH 44325 USA;

    Tongji Univ, Sch Environm Sci & Engn, State Key Lab Pollut Control & Resource Reuse, 1239 Siping Rd, Shanghai 200092, Peoples R China;

    Hunan Univ Technol, Coll Life Sci & Chem, Zhuzhou 412007, Peoples R China;

    Henan Polytech Univ, Sch Mat Sci & Engn, Jiaozuo 454003, Peoples R China;

    Univ Akron, Dept Chem & Biomol Engn, Akron, OH 44325 USA;

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  • 正文语种 eng
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  • 关键词

    double network hydrogels; interfacial toughness; nonporous substrate; self-recovery; surface adhesion;

    机译：双网络水凝胶;界面韧性;无孔基材;自恢复;表面粘附;

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