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Selective Laser Sintering Fabricated Thermoplastic Polyurethane/Graphene Cellular Structures with Tailorable Properties and High Strain Sensitivity
- Source :
- Applied sciences 9 (2019). doi:10.3390/app9050864, info:cnr-pdr/source/autori:Alfredo Ronca, Gennaro Rollo, Pierfrancesco Cerruti, Guoxia Fei, Xinpeng Gan, Giovanna G Buonocore, Marino Lavorgna, Hesheng Xia, Clara Silvestre, Luigi Ambrosio/titolo:Selective Laser Sintering Fabricated Thermoplastic Polyurethane%2FGraphene Cellular Structures with Tailorable Properties and High Strain Sensitivity/doi:10.3390%2Fapp9050864/rivista:Applied sciences/anno:2019/pagina_da:/pagina_a:/intervallo_pagine:/volume:9, Applied Sciences, Volume 9, Issue 5, Applied Sciences, Vol 9, Iss 5, p 864 (2019)
- Publication Year :
- 2019
- Publisher :
- Molecular Diversity Preservation International, Basel, 2019.
-
Abstract
- Electrically conductive and flexible thermoplastic polyurethane/graphene (TPU/GE) porous structures were successfully fabricated by selective laser sintering (SLS) technique starting from graphene (GE)-wrapped thermoplastic polyurethane (TPU) powders. Several 3D mathematically defined architectures, with porosities from 20% to 80%, were designed by using triply periodic minimal surfaces (TMPS) equations corresponding to Schwarz (S), Diamond (D), and Gyroid (G) unit cells. The resulting three-dimensional porous structures exhibit an effective conductive network due to the segregation of graphene nanoplatelets previously assembled onto the TPU powder surface. GE nanoplatelets improve the thermal stability of the TPU matrix, also increasing its glass transition temperature. Moreover, the porous structures realized by S geometry display higher elastic modulus values in comparison to D and G-based structures. Upon cyclic compression tests, all porous structures exhibit a robust negative piezoresistive behavior, regardless of their porosity and geometry, with outstanding strain sensitivity. Gauge factor (GF) values of 12.4 at 8% strain are achieved for S structures at 40 and 60% porosity, and GF values up to 60 are obtained for deformation extents lower than 5%. Thermal conductivity of the TPU/GE structures significantly decreases with increasing porosity, while the effect of the structure architecture is less relevant. The TPU/GE porous structures herein reported hold great potential as flexible, highly sensitive, and stable strain sensors in wearable or implantable devices, as well as dielectric elastomer actuators.
- Subjects :
- Materials science
thermoplastic polyurethane (TPU)
02 engineering and technology
010402 general chemistry
lcsh:Technology
01 natural sciences
mathematically defined structures
law.invention
lcsh:Chemistry
Thermoplastic polyurethane
law
graphene (GE)
General Materials Science
Thermal stability
Composite material
strain sensors
Porosity
lcsh:QH301-705.5
Instrumentation
Elastic modulus
Fluid Flow and Transfer Processes
lcsh:T
Graphene
Process Chemistry and Technology
General Engineering
021001 nanoscience & nanotechnology
lcsh:QC1-999
0104 chemical sciences
Computer Science Applications
Selective laser sintering
lcsh:Biology (General)
lcsh:QD1-999
lcsh:TA1-2040
Gauge factor
piezoresistivity
selective laser sintering (SLS)
lcsh:Engineering (General). Civil engineering (General)
0210 nano-technology
lcsh:Physics
Gyroid
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Applied sciences 9 (2019). doi:10.3390/app9050864, info:cnr-pdr/source/autori:Alfredo Ronca, Gennaro Rollo, Pierfrancesco Cerruti, Guoxia Fei, Xinpeng Gan, Giovanna G Buonocore, Marino Lavorgna, Hesheng Xia, Clara Silvestre, Luigi Ambrosio/titolo:Selective Laser Sintering Fabricated Thermoplastic Polyurethane%2FGraphene Cellular Structures with Tailorable Properties and High Strain Sensitivity/doi:10.3390%2Fapp9050864/rivista:Applied sciences/anno:2019/pagina_da:/pagina_a:/intervallo_pagine:/volume:9, Applied Sciences, Volume 9, Issue 5, Applied Sciences, Vol 9, Iss 5, p 864 (2019)
- Accession number :
- edsair.doi.dedup.....e2ec5393b43ba208f00cab2fcf3b371a
- Full Text :
- https://doi.org/10.3390/app9050864