Salt‐Mediated Polyampholyte Hydrogels with High Mechanical Strength, Excellent Self‐Healing Property, and Satisfactory Electrical Conductivity,Advanced Functional Materials

当前位置： X-MOL 学术 › Adv. Funct. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Salt‐Mediated Polyampholyte Hydrogels with High Mechanical Strength, Excellent Self‐Healing Property, and Satisfactory Electrical Conductivity
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-09-16 , DOI: 10.1002/adfm.201804416
Tangjie Long ₁ , Yixuan Li ₁ , Xu Fang ₁ , Junqi Sun ₁

Affiliation

In this work, self‐healing polyampholyte hydrogels with high mechanical strength in megapascal order, good resilience, improved toughness, and satisfactory conductivity are fabricated via one‐step polymerization of positively charged imidazolium‐based ionic liquid monomers containing urea groups and negatively charged 3‐sulfopropyl methacrylate potassium salt monomers followed by subsequent dialysis in water. Dialysis can remove partial counter ions in the original hydrogels to strengthen electrostatic interactions between imidazolium and sulfonate groups and improve mechanical strength of the hydrogels. After dialysis for 3 d, the originally soft hydrogels become mechanically robust with a tensile strength of ≈1.3 MPa, strain at break of ≈720%, and toughness of ≈6.7 MJ m⁻³. Hydrogen‐bonding interactions between urea groups, which act as sacrificial bonds to dissipate energy, are important to improve the mechanical strength and toughness of the hydrogels. More importantly, the hydrogel can automatically heal from physical cut at room temperature with a healing efficiency of ≈91% because of the reversibility of the electrostatic and hydrogen‐bonding interactions. Because of the undialyzed salts in the hydrogels, the mechanically robust hydrogels possess a satisfactory ionic conductivity of ≈3 S m⁻¹ at room temperature and can serve as highly flexible and stretchable conductors with self‐healing capacity.

中文翻译：

具有高机械强度，优异的自修复性能和令人满意的电导率的盐介导的两性电解质水凝胶

在这项工作中，通过一步步聚合含有尿素基团和带负电荷的3-甲基丙烯酸磺丙酯钾盐单体，随后在水中透析。透析可以去除原始水凝胶中的部分抗衡离子，从而增强咪唑鎓和磺酸盐基团之间的静电相互作用并提高水凝胶的机械强度。透析3 d后，最初的软水凝胶在机械上变得坚固，拉伸强度约为1.3 MPa，断裂应变约为720％，韧性约为6.7 MJ m ^-3。脲基团之间的氢键相互作用（作为牺牲键来耗散能量）对于提高水凝胶的机械强度和韧性很重要。更重要的是，由于静电和氢键相互作用的可逆性，水凝胶可以在室温下从物理切割中自动愈合，修复效率约为91％。由于水凝胶中存在未透析的盐，因此机械坚固的水凝胶在室温下具有令人满意的约3 S m ^-1的离子电导率，并且可以用作具有自我修复能力的高度柔性和可拉伸导体。

更新日期：2018-09-16

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南