高强度抗冻导电凝胶在应变传感器方面应用的可行性.docVIP

长春工业大学毕业设计（论文） PAGE 26 制备一种凝胶探究其在应变传感器方面应用的可行性 摘 要 近年来，可穿戴柔性电子设备呈现出巨大的市场发展前景。导电水凝胶作为一种具有高导电性的新兴软材料引起了学者的广泛关注，已经成为设计生物执行器、健康监测传感器和柔性可穿戴设备的理想材料。然而，大多数导电水凝胶往往存在机械性能差、生物相容性差、不可重复使用、工作温度范围窄等问题，极大的限制了实际应用。 本文采用聚乙烯醇、明胶、甘油和氯化钠共混的方法，制备了一种新颖的兼具高强度、导电性、应变敏感性和低温抗冻性的凝胶，并探究了其在应变传感器方面应用的可行性。所制备的凝胶具有较高的力学性能，断裂应力、断裂应变、弹性模量和韧性分别可以达到1044 kPa、715%、157 kPa和3605 kJ/m3。氯化钠的加入不仅提高了力学性能，同时赋予了凝胶优异的导电性（0.004 S/cm）。特别的是，该凝胶具有优异的应变敏感特性，可作为应变传感器监测人体的常规运动信号，包括手指的弯曲运动和说话等。此外，该凝胶具有低温耐受性，在-20℃的条件下可以保持灵活性，可以低温使用。因此，该凝胶在人机界面、生物传感器和可穿戴设备等各个领域都有着巨大的应用潜力。 关键词: 凝胶，韧性，抗冻性，导电性，应变传感器 Absract Recent years, wearable flexible electronic devices had shown wide market development prospects. As a new soft material with high conductivity, conductive hydrogel had attracted wide attention of scholars and became an ideal material for designing bioactuators, health monitoring sensors and flexible wearable devices. However, most conductive hydrogels exhibited poor mechanical properties, poor biocompatibility, non-reusability and narrow operating temperature range, which greatly limited the practical application. In this work, a novel gel with high strength, electrical conductivity, strain sensitivity and low temperature frost resistance was prepared by blending polyvinyl alcohol, gelatin, glycerin and sodium chloride, and the feasibility of gels applied in strain sensor was investigated. The prepared gel exhibited high mechanical properties, and the fracture stress, elongation strain, elastic modulus and toughness could reach 1044 kPa, 715%, 157 kPa and 3605 kJ/m3, respectively. The addition of sodium chloride not only improved the mechanical properties of gels, but also imparted excellent electrical conductivity (0.004 S/cm) to the gel. In particular, the gel had excellent strain-sensing properties and could be used as a strain sensor to monitor the human motions, including bending movements of finger and speaking. In addition, the gel exhibited low temperature resistant properties and could maintain flexibility at