瓜尔胶/聚丙烯酰胺基导电复合水凝胶的制备及传感性能

Preparation and Mechanical Sensing Properties of Guar Gum/Polyacrylamide-Based Conductive Composite Hydrogels

以聚丙烯酰胺和天然高分子瓜尔胶作为柔性基底,聚吡咯作为导电物质填料,设计制备出一种柔软的导电水凝胶。采用扫描电子显微镜观察水凝胶的截面形貌,通过拉力试验机测试水凝胶的弹性。测试结果表明其具有良好的可拉伸性能:最大拉伸应变为936.4%,拉伸应力为158.9 kPa,并且在对水凝胶进行15次拉伸应变为300%的拉伸-回复测试,水凝胶能回复原状,表明其具有快速的自恢复能力。进一步将水凝胶作为应变传感器监测人体的手指弯曲、手腕弯曲、吞咽等运动,可得到连续、准确且稳定的传感数据。这种多功能性的瓜尔胶/聚丙烯酰胺基导电复合水凝胶可用于可穿戴电子设备、健康和运动监测器等领域。

A kind of soft conductive hydrogel was designed and prepared using polyacrylamide and natural polymer guar gum as flexible substrates and polypyrrole as a conductive filler.The cross-section morphologies of the hydrogels were observed by scanning electron microscopy and the elasticity of the hydrogels was tested by a tensile testing machine.The test results showed that the hydrogels possess good tensile properties with the maximum tensile strain of 936.4%and the tensile stress of 158.9 kPa.After 15 times of tensile-recovery tests at the tensile strain of 300%,the hydrogel can return to its original state,indicating its rapid self-recovery ability.Furthermore,the hydrogel was used as strain sensors to monitor a human finger bending,wrist bending,swallowing and other movements.Continuous,accurate,and stable sensing data can be obtained.This multifunctional guar gum/polyacrylamide-based conductive composite hydrogel is expected to be used in wearable electronic devices,health and exercise monitors and other fields.