Highly Flexible, Stretchable, and Compressible Lignin‐Based Hydrogel Sensors with Frost Resistance for Advanced Bionic Hand Control

Abstract Bio‐based hydrogels, valued for their flexibility, tunable mechanical properties, and biocompatibility, are promising materials for wearable skins and sensing devices in bionic hand control systems. Lignin, a biopolymer rich in functional groups, can be modified into UV‐curable monomers, enabling the development of 3D‐printed hydrogels via photopolymerization. However, the inherent rigidity of lignin's aromatic rings, coupled with covalent cross‐linking between lignin and other monomers, often limits the hydrogel's stretchability (poor strain) and compressibility. Additional challenges, including poor moisture retention and freeze resistance, further hinder their wider application. In this study, a…

• IR
  Innovative Research Group Project of the National Natural Science Foundation of China

  Award: 32101470
• CS
  China Scholarship Council

  Award: 202208120051