Telescopic anti-freezing full-physical crosslinked hydrogel material for multi-mode flexible sensor and preparation method thereof

Abstract

The invention discloses a telescopic anti-freezing full-physical crosslinked hydrogel material for a multi-mode flexible sensor and a preparation method thereof. The hydrogel material is an ionic conductor with a full-physical crosslinked structure and comprises a poly-N-hydroxyethyl acrylamide hydrogen bond network and a chitosan ion crosslinked network. N-hydroxyethyl acrylamide, chitosan and aphotoinitiator are taken as raw materials, and ultraviolet radiation curing and saline solution soaking crosslinking are carried out to obtain the poly-N-hydroxyethyl acrylamide hydrogen bond networkand the chitosan ion crosslinking network. The material has super-compressibility, high tensile strength, high toughness, self-restorability, self-healing property, fatigue resistance and mechanical stability, can maintain good mechanical properties and electrical conductivity in a low-temperature environment, and is expected to be applied to the fields of flexible electronics, wearable electronicequipment, tissue engineering, super capacitors, intelligent robots and the like.

Description

technical field [0001] The invention relates to the field of flexible sensing, in particular to a stretchable anti-freezing fully physically cross-linked hydrogel material for multi-mode flexible sensors and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of flexible wearable electronic devices and intelligent robots, flexible sensing technology has subverted people's cognition of the form and function of traditional sensor devices and systems. Flexible sensor devices can not only stretch like rubber, but also conduct electricity like metal, and can sense mechanical signals through flexible functional units, so as to realize the measurement of flexible morphological systems. At present, flexible sensors have been widely used in the fields of health care, body movement recognition, and intelligent machines to remotely collect signals such as heart rate, pulse, electrolyte concentration, blood sugar, respiratory rate, and...

AI Technical Summary

Problems solved by technology

But there are following three shortcomings in these methods: 1) material rigidity is big, is unfavorable for closely fitting with skin or other tissue; The application of large strain monitoring of intelligent machines; 3) Poor recyclability may cause serious waste plastic pollution and electronic waste pollution, these problems seriously restrict the application of flexible sensor devices in human wearable devices

In 2018, "Advanced Function Materials" reported an ultrasensitive flexible pressure ion hydrogel sensor made of polyacrylamide and polyvinyl alcohol. Under pressure, the hydrogel sensor has a compressive sensitivity of 0.05kPa -1 , but the hydrogel sensor has a small pressure monitoring range (0-7kPa) (Stretchable, Transparent, and Self-Patterned Hydrogel-Based Pressure Sensor for Human Motions Detection. Advanced Function Materials, 2018, 28, 1802576)

The disadvantage is that the chemical crosslinked network of poly N-hydroxyethylacrylamide will be irreversibly broken during the stretching process, which makes it difficult to recover the mechanical properties of the hydrogel material, so it has poor fatigue resistance, softening and The problem of unstable mechanical properties

[0005] So far, among the reported flexible sensors, there are very few multi-mode hydrogel-based sensors that can take into account both strain and stress, and they are able to maintain mechanical softness, electrical conductivity, high sensitivity, cycle stability and Durable multifunctional hydrogel-based multimodal flexible sensors have not been reported

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