Abstract

Chitosan adhesive hydrogels have attracted interest because of their unique properties. However, it is still a challenge to use simple and unmodified chitosan to synthesize multifunctional hydrogels with adhesive, self-healing and strain sensing properties. Here, a multifunctional hydrogel of Ca²⁺-chitosan/polyacrylamide（Ca²⁺- CS/PAAm）with adhesive self-healing and strain sensing properties was carried out by one-step preparation method. The hydrogel has the ability to adhere to a variety of materials, wherein the adhesion strength to rubber surface is 48.4 kPa. The hydrogel has excellent strain sensing capability on finger bending or cyclic stretching, the sensitivity factor is 0.41 ± 0.015. The cut hydrogel healed completely at room temperature within 4 h, and the healing hydrogel can be stretched to 5 times of its original length. This makes Ca²⁺-CS/PAAm hydrogel to be great potential in the application of strain sensors, wound dressing and skin adhesives.

摘要

壳聚糖粘性水凝胶因其独特的性质而引起了人们的兴趣。然而，使用简单且未经修饰的壳聚糖来合成具有粘性、自修复和应变传感特性的多功能水凝胶仍然是一个挑战。在这里，Ca ^{2+ -}壳聚糖/聚丙烯酰胺（Ca ²⁺- CS/PAAm）具有胶粘剂自修复和应变传感特性，采用一步法制备。水凝胶对多种材料具有粘附能力，其中对橡胶表面的粘附强度为48.4 kPa。该水凝胶对手指弯曲或循环拉伸具有优异的应变传感能力，灵敏度系数为0.41±0.015。切割后的水凝胶在室温下4小时内完全愈合，愈合后的水凝胶可以拉伸到原来长度的5倍。这使得 Ca ²⁺ -CS/PAAm 水凝胶在应变传感器、伤口敷料和皮肤粘合剂的应用中具有巨大的潜力。