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摘要
Poly(ethylene-co-octene)/multi-walled carbon nanotubes/carbon fibre (POE/MWCNTs/CF, 90:5:5, W/ W/W) composites were prepared by melt-mixing, and the composites were then foamed in a batch process using supercritical carbon dioxide foaming method. The cell structure was analyzed for the microcellular samples prepared at foaming temperatures of 55, 60 and 65 ℃, and its effect was emphasized on the compression properties of the microcellular samples and the piezoresistive response (sensitivity and linear response range) of the assembled sensors. It was demonstrated that the microcellular sample foamed at 55 ℃ exhibited a relatively uniform cell structure, a narrower cell diameter distribution (mainly in the range of 10?30 μm), and moderately thick and highly continuous cell walls, which endowed the microcellular sample with higher resilience, compression strength, compression modulus and electrical conductivity. The sensor assembled with this microcellular disk had a wider linear response range (0?30% compression strain) and higher sensitivity (strain factor of 1.67), which were analyzed based on the cell structure. The sensor exhibited faster piezoresistive response and recovery performance and good repeatability, and showed higher stability and durability in the 1000 cycles of cyclic compression/ release test with 30% strain. Moreover, the sensor could monitor typical human motions, such as finger pressing, elbow bending, squatting, and foot stepping, which corresponded to a wider compressive strain range . The results demonstrate that the microcellular conductive composites with more uniform cell structure and moderately thick and highly continuous cell walls foamed by supercritical fluid foaming method have good sensing performance. ? 2023 Authors.
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