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首页> 外文期刊>Advanced Functional Materials >Dipole-Dipole and H-Bonding Interactions Significantly Enhance the Multifaceted Mechanical Properties of Thermoresponsive Shape Memory Hydrogels
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Dipole-Dipole and H-Bonding Interactions Significantly Enhance the Multifaceted Mechanical Properties of Thermoresponsive Shape Memory Hydrogels

机译：偶极-偶极和氢键相互作用显着增强了热响应形状记忆水凝胶的多方面力学性能

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摘要

High strength hydrogels were previously constructed based on dipole-dipole and hydrogen bonding reinforcement. In spite of the high tensile and com-pressive strengths achieved, the fracture energy of the hydrogels strengthened with sole noncovalent bondings was rather low due to the lack in energy dissipating mechanism. In this study, combined dipole-dipole and hydrogen bonding interactions reinforced (DHIR) hydrogels are synthesized by one-step copolymerization of three feature monomers, namely acrylonitrile (AN, dipole monomer), acrylamide (AAm, H-bonding monomer), and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS, anionic monomer) in the presence of PEGDA575, a hydrophilic crosslinker. The electrostatic repulsion from PAMPS allows the gel network to absorb water readily, and meanwhile the synergistic effect of dipole-dipole and H-bonding interactions enable the DHIR hydrogel to withstand up to 8.3 MPa tensile stress, 4.8 MPa compressive stress and 140-716% elongation at break with the fracture energy reaching as high as 5500 J/m~2. In addition, this DHIR hydrogel exhibits reversible mechanical properties after undergoing cyclic loading and unloading. Interestingly, the DHIR hydrogels with appropriate compositions demonstrate temperature-tunable mechanical properties as well as accompanied shape memory effect The dual noncovalent bonding strengthening mechanism reported here offers a universal strategy for significantly enhancing the comprehensive mechanical properties of hydrogels.
机译：高强度水凝胶以前是基于偶极-偶极和氢键结合增强构造的。尽管获得了高的拉伸和压缩强度，但由于缺乏能量耗散机制，仅用非共价键增强的水凝胶的断裂能仍然很低。在这项研究中，通过三步单体丙烯腈（AN，偶极子单体），丙烯酰胺（AAm，H键单体）和2的特征单体的一步共聚，合成了偶极-偶极和氢键相互作用增强的复合（DHIR）水凝胶。 PEGDA575（一种亲水性交联剂）存在下的-丙烯酰胺基-2-甲基-1-丙烷磺酸（AMPS，阴离子单体）。来自PAMPS的静电排斥使凝胶网络易于吸收水，同时偶极-偶极与氢键相互作用的协同作用使DHIR水凝胶能够承受高达8.3 MPa的拉应力，4.8 MPa的压应力和140-716％断裂伸长率高达5500 J / m〜2。另外，该DHIR水凝胶在经历循环加载和卸载后表现出可逆的机械性能。有趣的是，具有适当组成的DHIR水凝胶显示出温度可调的机械性能以及伴随的形状记忆效应。本文报道的双重非共价键增强机理为显着增强水凝胶的综合机械性能提供了一种通用策略。

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  • 来源
    《Advanced Functional Materials》 |2015年第3期|471-480|共10页
  • 作者

    Yinyu Zhang; Yongmao Li; Wenguang Liu;

  • 作者单位

    School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional Materials Tianjin University Tianjin 300072, P. R. China, Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin 300072, P. R. China;

    School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional Materials Tianjin University Tianjin 300072, P. R. China, Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin 300072, P. R. China;

    School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional Materials Tianjin University Tianjin 300072, P. R. China, Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin 300072, P. R. China;

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