Lightweight conductive graphene/thermoplastic polyurethane foams with ultrahigh compressibility for piezoresistive sensing

Liu, Hu; Dong, Mengyao; Wen-ju, Huang; Gao, Jian; Dai, Kun; Guo, Jiang; Zheng, Guoqiang; Liu, Chuntai; Shen, Changyu; Guo, Zhanhu

doi:10.1039/c6tc03713e

Cited by 578 publications

(357 citation statements)

References 65 publications

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“…And the absolute value of negative permittivity increases with increasing CNT content owing to the enhanced effective concentration of delocalized electron in CNT/PVDF composites according to Drude's model [69]. Similar negative permittivity phenomena were also reported in various conductorinsulator composites [70][71][72][73][74]. Figure 3d depicts the frequency dependence of loss tangent for CNT/PVDF composites.…”

Section: Resultssupporting

confidence: 50%

Improved dielectric permittivity and retained low loss in layer-structured films via controlling interfaces

Mao

Shi

Wang

et al. 2018

Adv Compos Hybrid Mater

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The search for high-performance dielectric materials has long been driven by the urgent needs for various modern electronics. However, enhanced permittivity is always accompanied by elevated loss, which seriously hinders the development and applications of dielectric materials. Herein, negative-k layers were introduced into layer-structured films, forming a new class of multilayer composites consisting of alternately stacked positive-k and negative-k layers. Compared with traditional multilayer composites without negative-k layers, the layered composites containing extra positive-k/negative-k interfaces exhibit superior ability in balancing the contradict parameters: permittivity and loss, yielding substantially enhanced permittivity without sacrificing the low loss. It is indicated that the permittivity was enhanced by the charge accumulations and reinforced polarizations on the interfaces between positive-k and negative-k layers. Meanwhile, the loss induced by the leakage current was suppressed by the blocked transport of carriers between adjacent layers. The trilayered 60-3.5-60 composite exhibits an enhanced dielectric constant (ε′ ≈ 33 @10 kHz) and retained low loss (tanδ ≈ 0.12 @10 kHz) compared with the single-layer BT/PVA composite containing 60 wt% BT fillers (ε′ ≈ 9.5 @10 kHz, tanδ ≈ 0.075 @10 kHz). This research offers an effective way to design and fabricate novel high-performance dielectric materials.

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Section: Resultssupporting

confidence: 50%

Improved dielectric permittivity and retained low loss in layer-structured films via controlling interfaces

Mao

Shi

Wang

et al. 2018

Adv Compos Hybrid Mater

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“…[9] So far, polyurethanes and their composites have been used in a number of SMP applications, such as sensors and actuators. [10–14] More recently, highly tunable thermoset shape-memory polyurethanes with permanent shape reconfigurability have been synthesized, where the cross-linking density can be adjusted over a wide range. [15, 16] This discovery, in many ways, blurs the traditional definition of thermoplastic and thermoset SMPs.…”

Section: Introductionmentioning

confidence: 99%

Fast-responding bio-based shape memory thermoplastic polyurethanes

Petrovìć

Milić

Zhang

et al. 2017

Polymer

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Novel fast response shape-memory polyurethanes were prepared from bio-based polyols, diphenyl methane diisocyanate and butane diol for the first time. The bio-based polyester polyols were synthesized from 9-hydroxynonanoic acid, a product obtained by ozonolysis of fatty acids extracted from soy oil and castor oil. The morphology of polyurethanes was investigated by synchrotron ultra-small angle X-ray scattering, which revealed the inter-domain spacing between the hard and soft phases, the degree of phase separation, and the level of intermixing between the hard and soft phases. We also conducted thorough investigations of the thermal, mechanical, and dielectric properties of the polyurethanes, and found that high crystallization rate of the soft segment gives these polyurethanes unique properties suitable for shape-memory applications, such as adjustable transition temperatures, high degree of elastic elongations, and good mechanical strength. These materials are also potentially biodegradable and biocompatible, therefore suitable for biomedical and environmental applications.

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“…[30] PDMS, as emicrystalline materialt hat does not age physically,p ossess separation performance stability at the expense of high flux. [31] In conclusion, by enhancing solvent sorption through the organophilicity of PAF-1 andh ypercrosslinked polymers and abatinglosses in free spaces, physical aging in PTMSPpervaporation membranesc an be abated. As organic microporous nanofillers enhanced the permeable properties and inhibited the physical aging of PTMSP, the composite materials may also show promise for application in gas separation, [12,16] organic solventn anofiltration, and many other fields.…”

mentioning

confidence: 95%

Organic Microporous Nanofillers with Unique Alcohol Affinity for Superior Ethanol Recovery toward Sustainable Biofuels

et al. 2017

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To minimize energy consumption and carbon footprints, pervaporation membranes are fast becoming the preferred technology for alcohol recovery. However, this approach is confined to small-scale operations, as the flux of standard rubbery polymer membranes remain insufficient to process large solvent volumes, whereas membrane separations that use glassy polymer membranes are prone to physical aging. This study concerns how the alcohol affinity and intrinsic porosity of networked, organic, microporous polymers can simultaneously reduce physical aging and drastically enhance both flux and selectivity of a super glassy polymer, poly-[1-(trimethylsilyl)propyne] (PTMSP). Slight loss in alcohol transportation channels in PTMSP is compensated by the alcohol affinity of the microporous polymers. Even after continuous exposure to aqueous solutions of alcohols, PTMSP pervaporation membranes loaded with the microporous polymers outperform the state-of-the-art and commercial pervaporation membranes.

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Lightweight conductive graphene/thermoplastic polyurethane foams with ultrahigh compressibility for piezoresistive sensing

Abstract: Lightweight conductive graphene/thermoplastic polyurethane foams exhibited stable piezoresistive sensing signals at a strain of up to 90%.

Cited by 578 publications

References 65 publications

Improved dielectric permittivity and retained low loss in layer-structured films via controlling interfaces

Improved dielectric permittivity and retained low loss in layer-structured films via controlling interfaces

Fast-responding bio-based shape memory thermoplastic polyurethanes

Organic Microporous Nanofillers with Unique Alcohol Affinity for Superior Ethanol Recovery toward Sustainable Biofuels

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