Thermoplastic polyurethane elastomer (TPU) and piezoelectric ceramic barium titanate (BaTiO3) were blended by melt extrusion and crushed the composite at ultra-low temperature to obtain a powder for selective laser sintering (SLS) 3D printing.Meanwhile,another composite powder was prepared by mixing the commercial pure TPU SLS powder and BaTiO3 powder at high speed mechanical stirring.After SLS 3D printing,the former formed the uniformly dispersed structure of BaTiO3 island structure,while the latter formed the segregated network structure of BaTiO3 in the TPU matrix.The effects of the two structures,printing parameters and polarization conditions on the mechanical properties and electrical output of the SLS-printed parts were compared and analyzed.The results showed that the island structure was more conducive to charge storage and electromechanical conversion because there was no network pathway in TPU/BaTiO3 composite.TPU/BaTiO3 composite possessed both the flexibility of TPU and the piezoelectric properties of BaTiO3,so it had excellent electrical output due to the synergism of triboelectricity effect and piezoelectric effect when impacted by mechanical force.After 25s of external impact,the maximum open-circuit voltage and short-circuit current of TPU/BaTiO3 melt-extruded composite printed by SLS were 19V and 230nA respectively.
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基金资助
国家重点研发计划(2017YFE0111500)
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