研究目的
To investigate the influence on the composites piezoresistive response when different strains are applied (by varying the maximum displacement and the rate of displacement); moreover, the reproducibility of the piezoresistive properties over a high number of loading/unloading cycles was assessed. The piezoresistive behaviour of the material was also checked after performing a surface laser treatment.
研究成果
The study concluded that SEBS-CNTs nanocomposites with 5%wt. and 6%wt. of CNTs showed the best piezoresistive response. Laser surface treatment improved the piezoresistive performance, showing good reproducibility and coherence between strain cyclically imposed and material resistance during 1000 stretching/releasing cycles.
研究不足
The study highlights the instability of the average resistance during the initial cycling period after laser treatment and the need for electronics to correct this lack for practical applications.
1：Experimental Design and Method Selection:
The study involved processing SEBS-CNTs nanocomposites by injection moulding to evaluate the percolation threshold and studying the piezoresistive response under flexural strain. Conductive tracks were processed on nanocomposites surfaces by means of a laser treatment.
2：Sample Selection and Data Sources:
Bars and plates of SEBS-CNTs nanocomposites with different CNTs content were used for resistance measurements and electro-mechanical tests.
3：List of Experimental Equipment and Materials:
A twin screen extruder (Haake Eurolab), injection moulding machine (Babyplast 6/10P), dynamometer (Instron 5544), multimeter (Keithley 2700E), pulsed CO2 laser, and FE-SEM (Zeiss Merlin) were used.
4：Experimental Procedures and Operational Workflow:
The nanocomposites were tested under cyclic conditions and after laser surface treatment to assess piezoresistive performance.
5：Data Analysis Methods:
The electrical resistance and piezoresistive response were analyzed using Labview software.
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