Bending actuation and charge distribution behavior of polyurethane/carbon nanotube electroactive nanocomposites

Melvin, Gan Jet Hong; Ni, Qing‐Qing; Natsuki, Toshiaki

doi:10.1002/pc.23177

Cited by 13 publications

(5 citation statements)

References 35 publications

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“…14 Hence, S z can be improved at the same electrical field by enhancing electromechanical sensitivity (β, β = ε r /Y) through increasing ε r and decreasing Y of elastomer. To increase ε r , many fillers, including carbon nanotubes, 15,16 carbon nanospheres, 12 graphene nanosheets, 17,18 and organic strong polar azobenzene 19 have been chemically/physically incorporated into TPU to form the dielectric elastomer composites. However, only limited actuation strain was observed in such TPU composites due to their further increased Y.…”

Section: Introductionmentioning

confidence: 99%

Advanced dielectric elastomer based on optimized thermoplastic polyurethane–styrene ethylene butylene styrene blend: Experiment and simulation

Zhu

Zhang

Zhao

et al. 2021

J of Applied Polymer Sci

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Increasing the actuation characteristics of dielectric elastomer actuators (DEAs) under low electric field strength without compromising the elasticity and breakdown strength is still one of the great challenges in application field.Herein, we propose a simple, efficient, and controllable strategy to prepare dielectric elastomers with intrinsically good integrated properties by introducing styrene ethylene butylene styrene (SEBS) in thermoplastic polyurethane (TPU). Combined with experiments and molecular dynamics simulation, we find that the SEBS is uniformly dispersed in TPU matrix and a good interface structure is formed by pi-pi interaction and entanglement. The above characteristics lead to the destruction of the hydrogen bond network of TPU and the formation of single aggregation structure. Consequently, much decreased Young's modulus (Y) and enhanced breakdown field (E br ) are achieved. Especially, when the content of SEBS is 4.76 wt%, the blend shows a desirable Y of 2.4 MPa and a much improved E br (118 kV mm À1 ), which is about 59% lower and 42% higher than those of TPU, respectively. As a result, the maximum electrical strain area of the dielectric blend elastomer reaches 4.7%, which is 250% higher than that of pure TPU under the same electric field strength.

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Section: Introductionmentioning

confidence: 99%

Advanced dielectric elastomer based on optimized thermoplastic polyurethane–styrene ethylene butylene styrene blend: Experiment and simulation

Zhu

Zhang

Zhao

et al. 2021

J of Applied Polymer Sci

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“…The use of organoclay lead to the cell size reduction, however, uneven dispersion of the organoclay in the polyol solution was observed. While the incorporation of carbon nanotubes or graphenes in PUF has shown to improve its thermal, electrical, and mechanical properties [4,9,[22][23][24][25], studies on their influence on acoustic damping properties are limited [13,14,26]. A few studies reported the acoustic damping properties of PUF without correlation to its airflow resistivity.…”

Section: Introductionmentioning

confidence: 99%

Effects of multiwall carbon nanotube and perfluoroalkane additives on the sound absorption properties of flexible polyurethane foams

Ryu

Kim

et al. 2017

Polymer Composites

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The sound absorption properties and airflow resistivity of polyurethane foams (PUFs) with multiwall carbon nanotube (MWCNT), perfluoroalkane (PFA), dimethylsiloxane (HMDS), and MWCNT/PFA hybrid additives were investigated with varying additive content. The results show the close relationship of the sound absorption coefficient and airflow resistivity, and increasing flow resistivity was found to improve the sound absorption coefficient of the PUF. For the PUF with MWCNT (at 0.50 phr)/PFA (at 1.25 phr) hybrid additives, the sound absorption coefficient and airflow resistivity were 0.80 (in the frequency range of 1,600–2,500 Hz) and 439,900 Ns/m4, respectively, which were the highest values among the investigated additive species and additive content. The sound absorption coefficient of the PUF with MWCNT (at 0.50 phr)/PFA (at 1.25 phr) was increased by 82.0% compared to that of the PUF without additives, probably because the PUF has the smallest cell size among the additive species and compositions investigated in this study. The results of the sound absorption coefficient, airflow resistivity, and cell size of the PUF suggest that to decrease the cell size and to increase the tortuous paths of the foams, MWCNT/PFA hybrid additives appeared to be the most effective additives and showed synergistic effects in the formation of PUF, and its small cell size increased the sound absorption properties of PUF. POLYM. COMPOS., 39:E1087–E1098, 2018. © 2017 Society of Plastics Engineers

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“…To our knowledge, two mechanisms of electric field induced bending deformation have been suggested, which are migration of ionized solvents (plasticizers) induced thinner solvent enrichment layer (S-R layer) [21,22,24] and asymmetric distribution of space charges (i.e. bending electrostriction effect) [35,36]. Since the plasticizers are absence in the PUUs, the mechanism of S-R layer is not suitable to explain the bending deformation.…”

Section: Bending Actuation Mechanism Of Puusmentioning

confidence: 99%

Effect of branched structure on microphase separation and electric field induced bending actuation behaviors of poly(urethane–urea) elastomers

Zeng¹,

Fu²,

Liang³

et al. 2022

Smart Mater. Struct.

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Polyurethane elastomers (PUEs) as a type of electroactive polymers have wide applications in soft actuators, soft sensors and energy harvesting due to their high dielectric constant, high electrostriction coefficients, easy processing and structure adjustability, and superior biocompatibility etc. However, the relationship between microstructure and electromechanical properties of EAEs has not been fully understood. In this work, we fabricated the branch structured poly(urethane-urea) elastomers (PUUs) using hydroxy-terminated polybutadiene (HTPB) as soft segment, isophorone diisocyanate (IPDI) and 4,4-diaminodicyclohexylmethane (PACM) as hard segment, and hydroxyl-terminated four-armed polycaprolactone (PCL410) as branch structured chain extender for improving bending actuation performances, and understanding the relationship between structure and electromechanical properties. The degree of branched structure of PUUs were adjusted by the content of PCL410. The microphase separation kinetics of PUUs was enhanced as increase of PCL410 content, whereas the degree of microphase separation and hard domain (HD) size of PUUs were reduced. The mechanical loss and bending actuation stress of PUUs were significantly improved by incorporation of small amount of branched structure into PUU chains. The PUU with 2.60 mol.% of PCL410 showed 5.16 mm of bending displacement and 5.16 Pa of bending actuation stress at 7.2 kV (corresponding to 180 V/mm of the nominal electric field), which were 76.3, and 79 times higher than that of PUU without PCL410, respectively. The electric field induced bending actuation mechanism of branch structured PUUs was suggested that the bending actuation mechanism of branch structured PUUs is caused by electrostrictive effect from dipole orientation induced bending deformation of constrained segments and asymmetric charge density distribution on both anode and cathode sides of PUU films. Our results can provide new insight on design novel electroactive polyurethane elastomers.

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Bending actuation and charge distribution behavior of polyurethane/carbon nanotube electroactive nanocomposites

Cited by 13 publications

References 35 publications

Advanced dielectric elastomer based on optimized thermoplastic polyurethane–styrene ethylene butylene styrene blend: Experiment and simulation

Advanced dielectric elastomer based on optimized thermoplastic polyurethane–styrene ethylene butylene styrene blend: Experiment and simulation

Effects of multiwall carbon nanotube and perfluoroalkane additives on the sound absorption properties of flexible polyurethane foams

Effect of branched structure on microphase separation and electric field induced bending actuation behaviors of poly(urethane–urea) elastomers

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