Tri-state recyclable multifunctional hydrogel for flexible sensors,Journal of Applied Polymer Science

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Tri-state recyclable multifunctional hydrogel for flexible sensors
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2022-08-01 , DOI: 10.1002/app.52928
Ruonan Liu ₁ , He Liu ₁ , Tong Lyu ₁ , Kun Chen ₁ , Zhaoyang Wang ₁ , Ye Tian _{1,

2}

Affiliation

Recent developments in hydrogel functional materials have created opportunities for building flexible sensors with multiple kinetic properties. Despite this, the research of multifunctional hydrogels for sensor applications is still a challenge. Herein, we present a recyclable multifunctional hydrogel synthesized from polyvinyl alcohol (PVA), hydroxyethyl cellulose (HEC), glycerin, and borax with three different states (named PHG, PHG-F, and PHG-S, respectively). Among them, PHG hydrogels have unique transparency, plasticity, self-healing, injectability, electrical conductivity and thermal sensitivity, and can be used to detect temperature changes with high accuracy and fast response. PHG-F hydrogels are obtained by cryogenic freezing of PHG hydrogels, which have strong mechanical properties and toughness (up to 0.66 MPa) and can provide excellent performance for human motion monitoring applications. PHG-S hydrogels, obtained by swelling of dried PHG hydrogels, have stronger mechanical properties and toughness (up to 1.31 MPa), and high conductivity (up to 2.3 S m⁻¹) obtained by immersion in ionic salt solutions, making them very suitable for strain sensing. The tri-state and recyclable multifunctional hydrogels we developed might even prove useful for practical/smart materials, wearable devices, soft machines, and biomedical uses.

中文翻译：

用于柔性传感器的三态可回收多功能水凝胶

水凝胶功能材料的最新发展为构建具有多种动力学特性的柔性传感器创造了机会。尽管如此，用于传感器应用的多功能水凝胶的研究仍然是一个挑战。在这里，我们提出了一种可回收的多功能水凝胶，由聚乙烯醇 (PVA)、羟乙基纤维素 (HEC)、甘油和硼砂合成，具有三种不同的状态（分别称为 PHG、PHG-F 和 PHG-S）。其中，PHG水凝胶具有独特的透明性、可塑性、自愈性、可注射性、导电性和热敏性，可用于检测温度变化，准确度高，响应速度快。PHG-F水凝胶是通过PHG水凝胶低温冷冻得到的，具有很强的机械性能和韧性（高达0. 66 MPa），可为人体运动监测应用提供出色的性能。PHG-S 水凝胶是由干燥的 PHG 水凝胶溶胀得到的，具有更强的机械性能和韧性（最高 1.31 MPa）和高电导率（最高 2.3 S m^-1 ) 通过浸入离子盐溶液中获得，使其非常适合应变传感。我们开发的三态和可回收多功能水凝胶甚至可能被证明可用于实用/智能材料、可穿戴设备、软机器和生物医学用途。

更新日期：2022-08-01

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