Speaker
Description
Micro-composites comprising conductive fillers dispersed within polymer matrices have been attracting attention as a versatile stretchable electrode material in the wearable sensor field (1). PDMS and MWCNT show great potential as the fundamental materials for stretchable electrodes, especially in operating environments that are subjected to cyclic loads (2). This work aims to examine the mechanical and electrical responses of PDMS/MWCNT micro-composite (PMMC) films under monotonic and cyclic tensile loading conditions by observing changes in stress and resistance values. The correlation was analysed between MWCNT specimens with mass fractions of 3, 4, and 5-wt% and the material properties, including UTS, elastic modulus, and electrical conductivity. Furthermore, the material coefficients were determined for four hyperelastic models (Neo-Hookean, Mooney-Rivlin, 3rd-order Ogden, and Yeoh). The simulation results, based on the material coefficients, demonstrated that the 3rd-order Ogden model most closely resembled the actual mechanical behaviour of the specimens. This research makes contributions to understanding the mechanical and electrical behaviours of PMMC films for monotonic and cyclic loadings. Accurate material properties and hyperelastic material coefficients have been found. These may be used to evaluate the structural integrity of PMMC films by finite element analysis.
References
(1) Zhiyuan. Liu, et al. “Surface strain redistribution on structured microfibers to enhance sensitivity of fiber‐shaped stretchable strain sensors.”, Advanced materials 30 (2018): 1704229.
(2) Jian, Du, et al. “Optimized CNT-PDMS flexible composite for attachable health-care device.”, Sensors 20 (2020): 4523.
| Keywords | Cyclic mechanical properties, Cyclic tensile behaviour, Polymeric conductive materials, Stretchable conductive film, PDMS/MWCNT micro-composites |
|---|
