增韧抗冻水凝胶柔性应变传感器研究进展

Latest Studies on Toughened Anti-freeze Hydrogel Flexible Strain Sensor

水凝胶作为一种结构与生物组织类似的柔性材料,被广泛地应用在柔性传感器等领域。但其内部含水量较大导致力学性能较差,且在低温环境下易结冰失效。本文从增韧机理、抗冻方法以及疲劳特性等方面对增韧抗冻水凝胶进行了综述。首先,对不同增韧机理水凝胶的力学性能以及内部结构进行了对比;其次,讨论了低温环境下水凝胶的抗冻方法;最后,总结了水凝胶在长时间静态或循环加载情况下的疲劳损伤特性。未来应致力于增加水凝胶的保水抗冻性能,深入研究水凝胶疲劳失效机理,以期为耐低温、抗疲劳水凝胶传感器的应用提供理论基础。

As a flexible material with similar structure to biological tissue,hydrogel has been widely used in flexible sensors and other fields.However,the mechanical properties of hydrogel are poor because of its high water content,and the hydrogel is easy to freeze and fail under low temperature environment.This paper reviews recent studies of hydrogel from the aspects of toughening mechanism,antifreeze method,and fatigue characteristics.Firstly,the mechanical properties and internal structures between different toughening hydrogels are compared.Secondly,the antifreeze method of hydrogel under low temperature is discussed.Finally,the fatigue damage characteristics of hydrogel in long-term static or cycle mechanical loading are summarized.In the future,it should be committed to increase the water-freeze resistance of hydrogel,and further study the hydrogel fatigue failure mechanism,which may provide theoretical basis for the application of low temperature and fatigue resistant hydrogel sensors.