Stress-strain Hysteresis of a Carbon Nanotube Network as Polymer Nanocomposite Filler under Cyclic Deformation

Slobodian, Petr; Sáha, Petr; Zatloukal, Martin

doi:10.1063/1.3604482

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…The hysteresis behavior of the PLA/1 wt.% MWNT layers is clearer in Figure 6 , which shows that after a large hysteresis in the first cycle, the track of the three successive cycles of loading/unloading is nearly identical, with a minor deviation distinguished between the second and the fourth loops. This behavior is similar to the findings of Slobodian and Saha [ 47 ], where accordingly in the MWNT network, a ratcheting strain (mean value of the maximum and minimum strain in one cycle) takes place after the first compression cycle as a consequence of the primary deformation of the porous composition and blocked the reverse mobility of nanotubes in the middle of the dense networks. Through successive cycles of loading and unloading, the nanotubes’ reorder becomes stable and the MWNT network gets to a steady stress–strain hysteresis loop order.…”

Section: Resultssupporting

confidence: 89%

Piezoresistive Properties of 3D-Printed Polylactic Acid (PLA) Nanocomposites

et al. 2022

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An increasing interest is focused on the application of 3D printing for sensor manufacturing. Using 3D printing technology offers a new approach to the fabrication of sensors that are both geometrically and functionally complex. This work presents the analysis of the 3D-printed thermoplastic nanocomposites compress under the applied force. The response for the corresponding resistance changes versus applied load is obtained to evaluate the effectiveness of the printed layer as a pressure/force sensor. Multi-walled carbon nanotubes (MWNT) and high-structured carbon black (Ketjenblack) (KB) in the polylactic acid (PLA) matrix were extruded to develop 3D-printable filaments. The electrical and piezoresistive behaviors of the created 3D-printed layers were investigated. The percolation threshold of MWNT and KB 3D-printed layers are 1 wt.% and 4 wt.%, respectively. The PLA/1 wt.% MWNT 3D-printed layers with 1 mm thickness exhibit a negative pressure coefficient (NPC) characterized by a decrease of about one decade in resistance with increasing compressive loadings up to 18 N with a maximum strain up to about 16%. In the cyclic mode with a 1 N/min force rate, the PLA/1 wt.% MWNT 3D-printed layers showed good performance with the piezoresistive coefficient or gauge factor (G) of 7.6 obtained with the amplitude of the piezoresistive response (Ar) of about -0.8. KB composites could not show stable piezoresistive responses in a cyclic mode. However, under high force rate compression, the PLA/4 wt.% KB 3D-printed layers led to responses of large sensitivity (Ar = −0.90) and were exempt from noise with a high value of G = 47.6 in the first cycle, which is a highly efficient piezoresistive behavior.

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Section: Resultssupporting

confidence: 89%

Piezoresistive Properties of 3D-Printed Polylactic Acid (PLA) Nanocomposites

et al. 2022

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“…For an indentation load of ~27 mN, the F - d curves exhibit hysteresis behaviors for both the hybrid and polymer NMs, indicating the inelastic deformation of the AgNW networks and parylene polymer chains in the NMs during the indentation. The larger hysteresis of the hybrid NMs than the polymer NMs can be attributed to the larger inelastic deformation of the hybrid NMs, in which the breakdown of the interfacial bonding between the AgNW and the polymer matrix causes a larger energy dissipation than those caused by the polymer chain rearrangement ( 46 , 47 ). During the repeated loading-unloading cycles, the hysteresis gradually decreases.…”

Section: Resultsmentioning

confidence: 99%