Controllable distribution of conductive particles in polymer blends <i>via</i> a bilayer structure design: a strategy to fabricate shape-memory composites with tunable electro-responsive properties

Zheng, Yu; Qin, Jingxian; Shen, Jiabin; Guo, Shaoyun

doi:10.1039/d0tc01854f

Cited by 12 publications

(7 citation statements)

References 48 publications

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“…The combined use of BN particles and conductive heater layer leads to recovery times lower than other electro‐responsive actuators found in literature: PU‐TiO 2 SMP composites developed by Liu et al recovered their permanent shape in about 60 s under 70 V applied 20 ; epoxy‐based SMP composites presented by Lu et al achieved complete recovery in 74 s (4.8 V) 22 ; PU composites incorporating printed carbon nanotube layers proposed by Wang et al recover the shape in about 30 s 34 . Bilayer shape‐memory composites developed by Zheng et al 35 took around 220 s to recover their shape under 5 V voltage applied. Higher actuation speed can be found in the literature but at significantly higher voltage (around 20–40 V) 17,21,36,37 .…”

Section: Resultsmentioning

confidence: 78%

“…33 From the above-presented results, it can be seen that high-speed actuation at relatively low voltage has been obtained. The combined Bilayer shape-memory composites developed by Zheng et al 35 took around 220 s to recover their shape under 5 V voltage applied. Higher actuation speed can be found in the literature but at significantly higher voltage (around 20-40 V).…”

Section: Electro-responsive Actuators Characterizationmentioning

confidence: 99%

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Electro‐responsive shape‐memory composites obtained via dual‐curing processing

Russo

Ramírez

Fernández‐Francos

et al. 2022

Polymers for Advanced Techs

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In this work, electro-responsive shape-memory actuators were developed by incorporating a conductive heater in a dual-curing thiol-acrylate-epoxy shape-memory polymer (SMP). A conductive heater, consisting of an electrically conductive silverink track printed on Kapton ® substrate, was assembled to the SMP, taking advantage of the dual-curing processing. The shape-memory effect (SME) was activated by the heat dissipated by the Joule effect in the conductive track. Boron nitride agglomerates were dispersed in the thiol-acrylate-epoxy layers to increase thermal conductivity and achieve faster shape-recovery. A thermoelectric control unit was developed to control the shape recovery of the electro-responsive actuators and provide different activation strategies. The electrically activated SME was investigated and compared to a traditional SME based on an external heating source given by the dynamic mechanical analyzer (DMA) apparatus. Electro-responsive actuators were found extremely faster than the conventional SMPs based on external heating. The fastest recovery was obtained by the 15% boron nitride actuator, which recovered the 100% of the original shape in only 8 s. The thermoelectric controlling device provided an optimal control of the shape recovery speed based on the pulse width modulation of the heating current under the application of a low voltage (5 V).

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Section: Resultsmentioning

confidence: 78%

Section: Electro-responsive Actuators Characterizationmentioning

confidence: 99%

Electro‐responsive shape‐memory composites obtained via dual‐curing processing

Russo

Ramírez

Fernández‐Francos

et al. 2022

Polymers for Advanced Techs

View full text Add to dashboard Cite

show abstract

“…The flexible substrates include polyurethane (PU) [5], polydimethylsiloxane (PDMS) [6], natural rubber (NR) [7], styrene-butadiene-styrene block copolymer (SBS) [8 ] etc. Conductive nanofillers usually include carbon nanomaterials [9][10][11][12] (carbon black, carbon nanotubes [13],…”

Section: Introductionmentioning

confidence: 99%

Flexible and high-performance piezoresistive strain sensors based on carbon nanoparticles@polyurethane sponges

Zhang

Xiang

Zhu

et al. 2020

Composites Science and Technology

112

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In this work, flexible and high-performance piezoresistive strain sensors were fabricated by simple layer-by-layer electrostatic self-assembly of carbon nanoparticles on commercial polyurethane (PU) sponges. It was shown that the sponge-based strain sensors exhibited obviously positive and negative piezoresistive characteristics under tensile and compressive strains, respectively. The alternate assembly of carbon nanotubes (CNTs) and graphene nanoplatelets (GNPs) contributed to the construction of a more complete conductive network and significantly improved the sensing performance of the sensor due to the synergistic effect between CNTs and GNPs. Compared with the CNT@PU and CNT/GNP@PU sponge strain sensors, the CNT/GNP/CNT@PU sensor had a larger strain detection range and higher linearity. Besides, the CNT/GNP/CNT@PU sponge strain sensor showed high sensitivity (GF = 43,000 at 60% tensile strain and GF = − 1.1 at 50% compressive strain), responsive capability to very small strain (0.05%) and outstanding stability during 3000 loading cycles. Due to its excellent sensing performance, the CNT/GNP/CNT@PU sensor enabled monitoring of various physiological activities, including finger movements, wrist bending and walking etc. In addition, a 5 × 5 sensor array based on the sponge-based strain sensor was prepared to achieve accurate identification of weight distribution. This study provides valuable information for the development of flexible strain sensors with high-performance and low-cost.

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“…The morphology, flame retardancy, and EMI shielding performance of pure or modified cotton fabric were examined by complete tests. Besides, this multifunctional 39 cotton fabric was also tested as a heater to provide additional Joule heat by applying a small voltage. The mechanism of Ti 3 C 2 T x coated flame retardant cotton fabric was also discussed, and other multifunctional cotton fabrics would be prepared based on this work.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient MXene-Coated Flame Retardant Cotton Fabric for Electromagnetic Interference Shielding

Cheng

Zhang

Tian

et al. 2020

Ind. Eng. Chem. Res.

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In this work, a highly efficient flame retardant and electromagnetic interference (EMI) shielding coating on cotton fabric was fabricated by a simple solution impregnation and dipcoating method, which involved three layers of polyacetimidate (PEI), ammonium polyphosphate (APP), and Ti 3 C 2 T x . When exposed directly to flame, the PEI/APP coating lead to a char layer resulting in self-extinguishing performance. Particularly, the cotton fabric coated by increasing amounts of Ti 3 C 2 T x gradually achieved EMI shielding performance. When the Ti 3 C 2 T x sheets content was 5.2 mg/cm 2 , a high electrical conductivity of 670.3 S•m −1 and a EMI shielding effectiveness of 31.04 dB were achieved in the X-band with an absorption-dominated mechanism. Besides, such modified cotton fabric also has the potential to be used as an electrical heating material. The temperature could even reach up to about 64.3 °C under an applied voltage of just 4 V. Therefore, this work provided a feasible idea for preparing multifunctional fabrics.

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Controllable distribution of conductive particles in polymer blends via a bilayer structure design: a strategy to fabricate shape-memory composites with tunable electro-responsive properties

Abstract: Bilayer composites enable tunable electro-responsive shape-memory performances via the controllable distribution of MWCNTs.

Cited by 12 publications

References 48 publications

Electro‐responsive shape‐memory composites obtained via dual‐curing processing

Electro‐responsive shape‐memory composites obtained via dual‐curing processing

Flexible and high-performance piezoresistive strain sensors based on carbon nanoparticles@polyurethane sponges

Highly Efficient MXene-Coated Flame Retardant Cotton Fabric for Electromagnetic Interference Shielding

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