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首页> 外文期刊>ACS applied materials & interfaces >Dual Physically Cross-Linked Double Network Hydrogels with High Mechanical Strength, Fatigue Resistance, Notch-Insensitivity, and Self-Healing Properties
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Dual Physically Cross-Linked Double Network Hydrogels with High Mechanical Strength, Fatigue Resistance, Notch-Insensitivity, and Self-Healing Properties

机译：具有高机械强度，抗疲劳性，缺口不敏感性和自愈特性的双重物理交联双网络水凝胶

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摘要

Double-network (DN) hydrogels with high strength and toughness have been developed as promising materials. Herein, we explored a dual physically cross-linked polyacrylamide/xanthan gum (PAM/XG) DN hydrogel. The nonchemically cross-linked PAM/XG DN hydrogels exhibited fracture stresses as high as 3.64 MPa (13 times higher than the pure PAM single network hydrogel) and compressive stresses at 99% strain of more than 50 MPa. The hydrogels could restore their original shapes after continuously loading unloading tensile and compressive cyclic tests. In addition, the PAM/XG DN hydrogels demonstrated excellent fatigue resistance, notch-insensitivity, high stability in different harsh environments, and remarkable self healing properties, which might result from their distinctive physical-cross-linking structures. The attenuated total reflectance infrared spectroscopy (ATR-IR) and dynamic thermogravimetric analysis (TGA) results indicated that there were no chemical bonds (only hydrogen bonds) between the XG and PAM networks. The PAM/XG DN hydrogel synthesis offers a new avenue for the design and construction of DN systems, broadening current research and applications of hydrogels with excellent mechanical properties.
机译：具有高强度和韧性的双网络（DN）水凝胶已被开发为有前途的材料。在本文中，我们探索了双重物理交联的聚丙烯酰胺/黄原胶（PAM / XG）DN水凝胶。非化学交联的PAM / XG DN水凝胶表现出高达3.64 MPa的断裂应力（比纯PAM单网络水凝胶高13倍）和99％应变超过50 MPa的压应力。在连续加载，卸载拉伸和压缩循环试验后，水凝胶可以恢复其原始形状。此外，PAM / XG DN水凝胶具有出色的抗疲劳性，对缺口不敏感，在不同恶劣环境下的高稳定性以及非凡的自愈性能，这可能是由于其独特的物理交联结构所致。衰减全反射红外光谱（ATR-IR）和动态热重分析（TGA）结果表明，XG和PAM网络之间没有化学键（只有氢键）。 PAM / XG DN水凝胶合成为DN系统的设计和构建提供了新途径，从而拓宽了具有优异机械性能的水凝胶的当前研究和应用。

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