Green and sustainable cellulose-based shape memory composites with excellent conductivity for temperature warning

作者：Jiang, Zhicheng; Wang, Yanling; Huang, Zhijian; Ma, Wenjing; Gao, Shuting; Dong, Wei; Xu, Min^*

来源：Carbohydrate Polymers, 2022, 276: 118767.

DOI：10.1016/j.carbpol.2021.118767

• Shape memory polymers
• Porous cellulose gels
• Mechanical properties
• Conductivity
• Temperature warning sensor

Green and sustainable cellulose-based composites containing poly(epsilon-caprolactone) (PCL) with temperatureinduced shape memory properties and conductivity performance are presented. The composites are fabricated by in situ polymerization of epsilon-caprolactone (epsilon-CL) monomer in three-dimensional porous cellulose gels, and then silver-porous cellulose gel/poly(epsilon-caprolactone) (Ag-Cell/PCL) composites are fabricated by depositing Ag onto the surface of porous cellulose gel/poly(epsilon-caprolactone) (Cell/PCL) composites. The addition of PCL not only improves the mechanical properties of the Cell/PCL composites but also endows them with excellent shape memory properties. The Cell/PCL composites exhibit a high shape-fixing rate (98.9%) and can recover to their original shape within 8 s without external force. In addition, the Ag-Cell/PCL composites show superior and stable conductivity under different bending angles. Finally, a temperature warning sensor with fast performance is successfully designed using Ag-Cell/PCL composites. This work provides a means to develop temperature warning systems based on shape memory polymers.

• 单位
  南京林业大学