Preparation method and application of low temperature resistant self-healing hydrogel

Abstract

The invention relates to a hydrogel, and discloses a preparation method and application of a low-temperature-resistant self-healing hydrogel. Polyvinyl alcohol powder and borax are mixed in deionized water and ethylene glycol redox graphene respectively. Heat and stir in the solution until completely dissolved to form a uniform PVA mixed solution and borax mixed solution; add an equal mass of borax mixed solution into the PVA mixed solution, and stir slowly at 90°C to make it fully cross-linked and gelled; the gelled product Pressed into a mold to form a double network PVA‑rGO / H 2 O‑Eg Hydrogel. It has good stability and high sensitivity coefficient in the range of -10-60°C. The low-temperature-resistant self-healing hydrogel prepared by the present invention has a simple method, a wide range of raw materials, excellent toughness, low-temperature resistance and self-healing properties, and can be used to prepare high-sensitivity resistive strain sensors for use in flexible robots and smart wearables and other fields have broader application prospects.

Description

technical field [0001] The invention relates to a hydrogel, in particular to a preparation method and application of a hydrogel with toughness, self-healing and low-temperature resistance properties. Background technique [0002] With the popularity of smart terminals, wearable flexible electronic devices present a huge market prospect. As the core component of flexible electronic devices, flexible strain sensors have broad application prospects in electronic skin, human health monitoring, implantable devices, human-computer interaction systems, etc., and have become a key research direction in the field of hydrogel materials. In practical applications, it is very important to ensure the sensitivity and reliability of the sensing signal, which puts high demands on the strain sensitivity and linear response of hydrogels, and is also an important bottleneck problem faced by most current hydrogel stress-strain sensors. . How to achieve high stretchability while ensuring linea...

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Problems solved by technology

At the same time, hydrogels are easy to lose water, and the storage time at room temperature is not long, and the water in the hydrogel will freeze when the temperature is below zero or in more extreme cases, which greatly limits the ability of hydrogels. application prospects

The existing low-temperature-resistant self-healing hydrogels cannot balance the excellent low-temperature resistance and outstanding self-healing properties (Qinfeng Rong, Wenwei Lei, Lie Chen, et al, Angew.Chem.Int.Ed.10.1002 / anie.201708614)

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