Dielectric and piezoelectric properties in selective laser sintered polyamide11/BaTiO3/CNT ternary nanocomposites

Dielectric and piezoelectric properties in selective laser sintered polyamide11/BaTiO3/CNT... Polyamide11 (PA11)/BaTiO3/carbon nanotube (CNT) ternary nanocomposites (PBCNCs-3D) with 3D segregated percolation routes were fabricated by selective laser sintering (SLS) of CNT-coated PA11/BaTiO3 nanocomposite powder. The CNT-coated PA11/BaTiO3 nanocomposite powder show a higher laser absorption and wider sintering window than those of conventional PA11/BaTiO3/CNT ternary nanocomposite powders with a structure where CNTs are randomly distributed throughout the powder particles, endowing the composite powders with better sinterability. The 3D segregated conductive pathway was efficiently constructed in the PBCNCs-3D parts with a low percolation threshold of 0.3 wt%. The PBCNCs-3D parts showed a higher dielectric constant of 16.2 at a frequency of 1 kHz, which is approximately twice higher than that of SLS-printed composite parts (PBCNCs) without a segregated structure. Compared with PBCNCs, the piezoelectric strain coefficient increased from 1.7 to 2.1 pC/N. These results not only provide a new material for SLS processing but lay the groundwork to enhance the performance of piezoelectric polymer composites by constructing 3D segregated percolation routes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Materials & design Elsevier

Dielectric and piezoelectric properties in selective laser sintered polyamide11/BaTiO3/CNT ternary nanocomposites

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Publisher
Elsevier
Copyright
Copyright © 2018 Elsevier Ltd
ISSN
0264-1275
eISSN
0141-5530
D.O.I.
10.1016/j.matdes.2018.01.050
Publisher site
See Article on Publisher Site

Abstract

Polyamide11 (PA11)/BaTiO3/carbon nanotube (CNT) ternary nanocomposites (PBCNCs-3D) with 3D segregated percolation routes were fabricated by selective laser sintering (SLS) of CNT-coated PA11/BaTiO3 nanocomposite powder. The CNT-coated PA11/BaTiO3 nanocomposite powder show a higher laser absorption and wider sintering window than those of conventional PA11/BaTiO3/CNT ternary nanocomposite powders with a structure where CNTs are randomly distributed throughout the powder particles, endowing the composite powders with better sinterability. The 3D segregated conductive pathway was efficiently constructed in the PBCNCs-3D parts with a low percolation threshold of 0.3 wt%. The PBCNCs-3D parts showed a higher dielectric constant of 16.2 at a frequency of 1 kHz, which is approximately twice higher than that of SLS-printed composite parts (PBCNCs) without a segregated structure. Compared with PBCNCs, the piezoelectric strain coefficient increased from 1.7 to 2.1 pC/N. These results not only provide a new material for SLS processing but lay the groundwork to enhance the performance of piezoelectric polymer composites by constructing 3D segregated percolation routes.

Journal

Materials & designElsevier

Published: Apr 5, 2018

References

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