Multifunctional polyurethane hydrogel based on a phenol–carbamate network and an Fe3+–polyphenol coordination bond toward NIR light triggered actuators and strain sensors,Journal of Materials Chemistry A

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Multifunctional polyurethane hydrogel based on a phenol–carbamate network and an Fe3+–polyphenol coordination bond toward NIR light triggered actuators and strain sensors
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-07-26 , DOI: 10.1039/d2ta04837j
Yang Liu _{1,

2} , Zetian Zhang _{1,

2} , Ze Liang _{1,

2} , Yong Yong _{1,

2} , Changkai Yang _{1,

2} , Zhengjun Li _{1,

2}

Affiliation

Multifunctional smart hydrogels have been extensively used in wearable devices, soft robotics, tissue engineering, and information storage, especially those with good mechanical properties, desired stimuli-responsiveness, high strain sensitivity, and recyclability. Herein, a novel synergistic dual-network polyurethane hydrogel was prepared through two steps, that is, tannic acid (TA) was firstly incorporated into a polyurethane backbone comprising thermosensitive polyethylene glycol/polypropylene glycol (PEG/PPG) blocks to obtain TA-based polyurethane (TAPU) bearing a phenol–carbamate network; subsequently, TAPU film was immersed in FeCl₃ aqueous solution to obtain a TAPU/Fe hydrogel bearing an Fe³⁺–polyphenol network. The prepared TAPU/Fe hydrogel exhibited a high tensile strength of 0.75 MPa, and large elongation at break of 550%. Benefiting from the thermosensitivity of PEG/PPG blocks and the photothermal effect of the Fe³⁺/TA complex, the TAPU/Fe hydrogel showed ideal near-infrared (NIR) light triggered actuating behavior and photothermal stability. Under the irradiation of NIR light, the flower-shaped hydrogel actuator can bend upward vertical to the horizontal plane within 2 min. Furthermore, Fe³⁺ incorporated into the hydrogel matrix can endow the TAPU/Fe hydrogel sensor with high strain sensitivity, which can be used for real-time, stable and repeated monitoring of human movement, and can also be designed as a light-driven switch to light an LED bulb. Built on the reversible cross-linked networks, the TAPU/Fe hydrogel with good biocompatibility can be recycled. Unexpectedly, the TAPU hydrogel showed blue fluorescence under UV light (365 nm) irradiation, and the fluorescence could be quenched (with Cu²⁺) and recovered (with ethylenediaminetetraacetic acid), resembling rewritable papers.

中文翻译：

基于苯酚-氨基甲酸酯网络和 Fe3+-多酚配位键的多功能聚氨酯水凝胶，用于近红外光触发致动器和应变传感器

多功能智能水凝胶已广泛用于可穿戴设备、软机器人、组织工程和信息存储，尤其是那些具有良好机械性能、所需刺激响应性、高应变敏感性和可回收性的水凝胶。在此，通过两个步骤制备了一种新型协同双网络聚氨酯水凝胶，即首先将单宁酸（TA）掺入包含热敏聚乙二醇/聚丙二醇（PEG/PPG）嵌段的聚氨酯骨架中，得到TA基聚氨酯。 (TAPU) 带有苯酚-氨基甲酸酯网络；随后，将TAPU薄膜浸入FeCl ₃水溶液中，得到含有Fe ^{3+的TAPU/Fe水凝胶。}-多酚网络。制备的 TAPU/Fe 水凝胶具有 0.75 MPa 的高拉伸强度和 550% 的大断裂伸长率。受益于 PEG/PPG 嵌段的热敏性和 Fe ³⁺ /TA 复合物的光热效应，TAPU/Fe 水凝胶表现出理想的近红外 (NIR) 光触发驱动行为和光热稳定性。在近红外光照射下，花形水凝胶致动器可以在 2 分钟内垂直向上弯曲到水平面。此外，Fe ³⁺结合到水凝胶基质中可以赋予TAPU/Fe水凝胶传感器高应变灵敏度，可用于实时、稳定和重复监测人体运动，也可设计为光驱动开关点亮LED电灯泡。建立在可逆交联网络上的 TAPU/Fe 水凝胶具有良好的生物相容性，可以回收利用。出乎意料的是，TAPU水凝胶在紫外光（365 nm）照射下呈现蓝色荧光，荧光可以被淬灭（用Cu ²⁺）和恢复（用乙二胺四乙酸），类似于可重写纸。

更新日期：2022-07-26

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