Electrically conductive composites of thermoplastic polyurethane (TPU), poly(vinylidene fluoride) (PVDF), and carbon black-polypyrrole (CB-PPy) were prepared by melt compounding followed by compression molding or by filament production followed by fused filament fabrication (FFF). The storage modulus (G′) and complex viscosity (η*) of the composites increased with the addition of CB-PPy leading to a more rigid material. The electrical and rheological percolation threshold of composites were 5 and 3 wt%, respectively. In fact, composites with 5 wt% or more CB-PPy content display G′ higher than G″ indicating a solid-like behavior. Furthermore, the addition of CB-PPy increased the electrical conductivity of all composites. However, the electrical conductivity values of composites containing 5 and 6 wt% of CB-PPy produced by compression molding are one and seven order of magnitude higher than those of FFF composites with same composition. Compression molded and 3D printed composites with 6 wt% of CB-PPy displayed high sensitivity/gauge factor, large measurement range and reproducible piezoresistive response during 100 loading-unloading cycles for both processing methods. The results presented in this study demonstrated the potential use of FFF for producing piezoresistive flexible sensors based on PVDF/TPU/CB-PPy composites.

Fabrication and characterization of piezoresistive flexible pressure sensors based on poly(vinylidene fluoride)/thermoplastic polyurethane filled with carbon black-polypyrrole / Bertolini, Mayara C.; Dul, Sithiprumnea; Lopes Pereira, Elaine C.; Soares, Bluma G.; Barra, Guilherme M. O.; Pegoretti, Alessandro. - In: POLYMER COMPOSITES. - ISSN 0272-8397. - 42:12(2021), pp. 6621-6634. [10.1002/pc.26327]

Fabrication and characterization of piezoresistive flexible pressure sensors based on poly(vinylidene fluoride)/thermoplastic polyurethane filled with carbon black-polypyrrole

Bertolini, Mayara C.;Dul, Sithiprumnea;Pegoretti, Alessandro
2021-01-01

Abstract

Electrically conductive composites of thermoplastic polyurethane (TPU), poly(vinylidene fluoride) (PVDF), and carbon black-polypyrrole (CB-PPy) were prepared by melt compounding followed by compression molding or by filament production followed by fused filament fabrication (FFF). The storage modulus (G′) and complex viscosity (η*) of the composites increased with the addition of CB-PPy leading to a more rigid material. The electrical and rheological percolation threshold of composites were 5 and 3 wt%, respectively. In fact, composites with 5 wt% or more CB-PPy content display G′ higher than G″ indicating a solid-like behavior. Furthermore, the addition of CB-PPy increased the electrical conductivity of all composites. However, the electrical conductivity values of composites containing 5 and 6 wt% of CB-PPy produced by compression molding are one and seven order of magnitude higher than those of FFF composites with same composition. Compression molded and 3D printed composites with 6 wt% of CB-PPy displayed high sensitivity/gauge factor, large measurement range and reproducible piezoresistive response during 100 loading-unloading cycles for both processing methods. The results presented in this study demonstrated the potential use of FFF for producing piezoresistive flexible sensors based on PVDF/TPU/CB-PPy composites.
2021
12
Bertolini, Mayara C.; Dul, Sithiprumnea; Lopes Pereira, Elaine C.; Soares, Bluma G.; Barra, Guilherme M. O.; Pegoretti, Alessandro
Fabrication and characterization of piezoresistive flexible pressure sensors based on poly(vinylidene fluoride)/thermoplastic polyurethane filled with carbon black-polypyrrole / Bertolini, Mayara C.; Dul, Sithiprumnea; Lopes Pereira, Elaine C.; Soares, Bluma G.; Barra, Guilherme M. O.; Pegoretti, Alessandro. - In: POLYMER COMPOSITES. - ISSN 0272-8397. - 42:12(2021), pp. 6621-6634. [10.1002/pc.26327]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/328918
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