Hydrogels are conductive and stretchable, allowing for their use in flexible electronic devices, such as electronic skins, sensors, human motion monitoring, brain–computer interface, and so on. Herein, we synthesized the copolymers having various molar ratios of 3,4-ethylenedioxythiophene (EDOT) to thiophene (Th), which served as conductive additives. With doping engineering and incorporation with P(EDOT-co-Th) copolymers, hydrogels have presented excellent physical/chemical/electrical properties. It was found that the mechanical strength, adhesion ability, and conductivity of hydrogels were highly dependent on the molar ratio of EDOT to Th of the copolymers. The more the EDOT, the stronger the tensile strength and the greater the conductivity, but the lower the elongation break tends to be. By comprehensively evaluating the physical/chemical/electrical properties and cost of material use, the hydrogel incorporated with a 7:3 molar ratio P(EDOT-co-Th) copolymer was an optimal formulation for soft electronic devices.

中文翻译：

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3,4-亚乙基二氧噻吩/噻吩共聚物的电活性和可拉伸水凝胶

水凝胶具有导电性和可拉伸性，可用于柔性电子设备，如电子皮肤、传感器、人体运动监测、脑机接口等。在此，我们合成了具有不同摩尔比的 3,4-亚乙基二氧噻吩 (EDOT) 与噻吩 (Th) 的共聚物，用作导电添加剂。通过掺杂工程和 P(EDOT- co-Th)共聚物、水凝胶表现出优异的物理/化学/电学性能。研究发现，水凝胶的机械强度、粘附能力和电导率高度依赖于共聚物中 EDOT 与 Th 的摩尔比。EDOT越多，拉伸强度越强，导电性越大，但断裂伸长率越低。通过综合评估物理/化学/电学性质和材料使用成本，掺入 7:3 摩尔比 P(EDOT-co-Th )共聚物的水凝胶是软电子设备的最佳配方。