Anti-freezing dual-network hydrogels with high-strength, self-adhesive and strain-sensitive for flexible sensors.
Anti-freezing dual-network hydrogels with high-strength, self-adhesive and strain-sensitive for flexible sensors.
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DOI：
10.1016/j.carbpol.2022.120229
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发表时间：
2022-10
影响因子：
11.2
通讯作者：
Lingkai Zeng;Xin-Chun Wang;Yahan Wen;Hong-Mei Chen;Hai-liang Ni;Wenhao Yu;Yuefeng Bai;K. Zhao-K.-Z
中科院分区：
文献类型：
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作者：
Lingkai Zeng;Xin-Chun Wang;Yahan Wen;Hong-Mei Chen;Hai-liang Ni;Wenhao Yu;Yuefeng Bai;K. Zhao-K.-Z
水凝胶作为柔性传感器由于其导电性、可拉伸性和柔性而引起了人们的极大关注。然而，制备同时具有高强度、抗疲劳、自粘附和抗冻性的水凝胶仍然是一个巨大的挑战。本文通过在壳聚糖链上原位聚合丙烯酸单体，并与氯化铝和甘油配位，制备了一种多功能双网络水凝胶。基于链缠结、氢键和配位作用，该双网络水凝胶具有优异的力学性能、良好的抗疲劳性能和优异的粘附性能。该传感器具有稳定的电导率和高灵敏度，可作为应变传感器，既可监测人体的大幅度运动，也可监测人体的细微运动。由于甘油的存在，水凝胶显示出出色的抗冻性，即使在低温（-20 °C）下仍然保持柔性和导电性。这种水凝胶可以作为一种灵活的可穿戴传感器，用于监测极端低温条件下的人体运动。
Hydrogels as flexible sensor have attracted significant attention due to its conductivity, stretchability and flexibility. However, it is still a great challenge to prepare hydrogels that simultaneously possess high strength, anti-fatigue, self-adhesion, and anti-freezing. Herein, a multifunctional dual-network hydrogel was prepared by in situ polymerization of acrylic monomer in chitosan chains, and coordinated with aluminum chloride and glycerol. Based on chain entanglement, hydrogen bonding and coordination interactions, this dual-network hydrogel exhibited excellent mechanical properties, good fatigue resistance, and excellent adhesion performance. It can be used as a strain sensor for its stable conductivity and high sensitivity, which could monitor both large human motions and subtle motions. Due to the presence of glycerol, the hydrogel showed outstanding freezing resistance and still kept flexible and conductive even at low temperatures (−20 °C). This hydrogel can be applied as a flexible wearable sensor for monitoring human motion in extreme low-temperature condition.