木质素基多功能共晶凝胶的制备及传感应用

Preparation of lignin-based multifunctional eutectogels and sensing applications

摘要:

以碱木质素(AL)和纤维素纳米晶体(CNC)为原料,低共熔溶剂(DES)为溶剂,制备了一种多功能共晶凝胶(DES-AL-CNC)。利用红外光谱仪、扫描电子显微镜、质构仪等对DES-AL-CNC共晶凝胶进行了表征。结果表明,AL的加入使得共晶凝胶具有优异的机械性能、黏附性和抗紫外性能。当AL的加入量为0.3%时,共晶凝胶的断裂应变和拉伸强度达到最大,分别为852%和542 kPa；可轻易地粘附在各种基材表面,其中对玻璃的黏附强度高达32 kPa；抗紫外能力可达100%。由于DES的存在,使得共晶凝胶具有优异的抗干燥性能,在65 ℃条件下7天质量减少低于10%。此外,该共晶凝胶可以组装成柔性应变传感器,拓宽了柔性可穿戴电子设备的应用。

Abstract:

A multifunctional eutectogel (DES-AL-CNC) was prepared using alkali lignin (AL) and cellulose nanocrystals (CNC) as raw materials and deep eutectic solvent (DES) as solvent. The DES-AL-CNC eutectogels were characterized using infrared spectroscopy, scanning electron microscopy, and mass spectrometer. The results showed that the addition of AL resulted in excellent mechanical properties, adhesion and UV resistance of the eutectogel. When the addition of AL was 0.3%, the eutectogel reached the maximum strain at break and tensile strength of 852% and 542 kPa, respectively; it could easily adhere to various substrate surfaces, including the adhesion strength to glass up to 32 kPa; and UV resistance up to 100%. Due to the presence of DES, the eutectogel has excellent resistance to drying, with a mass reduction of less than 10% at 65 °C for 7 days. In addition, the eutectogel can be assembled into flexible strain sensors, broadening the application of flexible wearable electronic devices.