柔性可拉伸硅橡胶@多壁碳纳米管/硅橡胶可穿戴应变传感纤维

Based on the core-shell structure design, flexible, stretchable, highly sensitive and stable polydimethylsiloxane silicone rubber@multiwalled carbon nanotubes/polydimethylsiloxane silicone rubber (PDMS@MWCNTs/PDMS) piezoresistive strain sensing fibers were fabricated via the simple and low-cost dip coating-curing method. The chemical structure, thermal stability and microstructures of silane coupling agent modified multiwalled carbon nanotubes (MWCNTs-KH570) were characterized by FTIR, XRD, TG and TEM. The effects of core-shell structure and MWCNTs-KH570 mass fraction on the electrical conductivity, the sensing properties and mechanical properties of the PDMS@MWCNTs/PDMS composite fibers, as well as the mechanics were investigated detailedly. The results show that KH570 is successfully grafted onto the surface of hydroxylation MWCNTs(MWCNTs-OH), leading to the good dispersibility and interface interaction in the shell layer PDMS matrix; The design of core-shell structure enables the PDMS@MWCNTs/PDMS composite fibers to have high electrical conductivity and sensing properties at the low filling; With increasing the MWCNTs-KH570 mass fraction, the PDMS@MWCNTs/PDMS composite fibers exhibit elevated electrical conductivity and sensing performances, and show superior repeatability and working stability in human joint motion monitoring.