Optimization of mechanical and dielectric properties of poly(urethane–urea)-based dielectric elastomers <i>via</i> the control of microstructure

Xiang, Dong; Liu, Miao; Chen, Guanliang; Zhang, Teng; Liu, Li; Liang, Yongri

doi:10.1039/c7ra11309a

Cited by 22 publications

(10 citation statements)

References 39 publications

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“…It is observed from Fig. 3 that the undoped polymer shows high electric resistivity of about 10 12 Ω-cm, which is found consistent with previous studies [42,[44][45][46][47]. Also, the inclusion of polar molecules in a nonpolar polymer matrix improves conductivity by reducing the resistivity by several orders of magnitude.…”

Section: Ba+pu Pnba+pu Dnba+pusupporting

confidence: 90%

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Synthesis of cross-linked polyurethane elastomers with the inclusion of polar-aromatic moieties (BA, PNBA and 3, 5-DNBA): Electrical and thermo-mechanical properties analysis

2021

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In this work, we used the design strategy “doped nonpolar polymers” and synthesized the polyurethane elastomers (PUEs) by doping with highly polar aromatic molecules such as benzoic acid (BA), 4(para)-nitro-benzoic acid (PNBA), and 3, 5-di-nitro-benzoic acid (3, 5-DNBA) by using the solution casting method. The effect of each molecule in three different weight percentages 2%, 4%, and 6% on electrical and thermo-mechanical properties of the material has studied. Experiments were carried out to determine electrical properties such as DC volume resistivity, dielectric constant, and loss factor. DMA and DSC measurements were done to assess thermo-mechanical properties. Also, thermal conductivity measurement was carried out and a strong nitro group and doping percentage dependent results have been observed. A comparative analysis of the effect on the said properties was done among the doped and undoped PUEs.

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Section: Ba+pu Pnba+pu Dnba+pusupporting

confidence: 90%

“…This can be explained by increasing the doping percentage (wt. %) of each type in the system the dielectric constant increases due to an increase in the mobility of polar groups and hence mobile groups which contributes more orientation [42][43][44]. The trend is shown in the graph (Fig.…”

Section: Dielectric Constant and Loss Factormentioning

confidence: 99%

Synthesis of cross-linked polyurethane elastomers with the inclusion of polar-aromatic moieties (BA, PNBA and 3, 5-DNBA): Electrical and thermo-mechanical properties analysis

2021

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“…HT-50C breakdown voltage tester from National Machinery Industry Corporation (China) was used to test Weibull distribution, which was then utilized to get breakdown strengths 24 according to Chinese Standard GB/T 1408-2006. Ten samples were measured for each composite.…”

Section: Methodsmentioning

confidence: 99%

Modulation and mechanism of spatial structure for multi-layer cyanate ester resin composites to achieve remarkably increased energy storage density and decreased dielectric loss

Zhang

Yuan

Liang

et al. 2020

Journal of Composite Materials

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Overcoming sticky problems of large dielectric loss and poor breakdown strength ( Eb) is prerequisite of actual applications for high dielectric constant polymer composites. Herein, three kinds of multi-layer structure composites with different spatial structures (2MP-CE/CNT, CE/CNT-2MP-CE/CNT, MP-CE/CNT-MP) were prepared based on carbon nanotubes (CNTs), cyanate ester (CE) resin and mica paper (MP). Compared with traditional single-layer CE/CNT composite, multi-layer CE/CNT-2MP-CE/CNT composites, of which the middle layer is two pieces of MPs with a thickness of 60 µm, while both bottom and top layers are CE/CNT composite, simultaneously achieve 105 reduction in dielectric loss and 18.1 times increase in energy storage density ( Ue). Through modulating two sheets of MPs and CE/CNT as top and bottom layer, respectively, 2MP-CE/CNT composite with 60 μm MPs has the largest breakdown strength ( Eb), its Eb and Ue are severally about 7.1 and 19.5 times of those of CE/CNT composite. The relationship and mechanism between spatial structure and integrated performance such as dielectric properties, Eb and Ue of composites were systematically investigated. The attractive integrated performances of CE/CNT-2MP-CE/CNT and 2MP-CE/CNT composites are attributed to their unique composition and spatial structures, which bring special micro-capacitance and interfacial polarization, and thus leading to outstanding performances. Therefore, this investigation provides a strategy for getting desirable performances through building composites with specific spatial structure.

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“…The presence of both groups of urethane and urea in the hard segments makes the structure of the hard domains to be decisive in optimizing of the dielectric and mechanical properties. 15 Polycaprolactone diol (PCL) which we used as soft segment, it is commonly used in the synthesis of biodegradable polymers. 16 PCL is one of the most extensively used biodegradable polyesters, due to the fact that the degradation product of PCL is 6-hydroxyhexanoic acid, which is naturally metabolized by the human body.…”

Section: Introductionmentioning

confidence: 99%

Physical properties and dielectric behavior of the poly(urethane‐urea) based on o‐dianisidine and renewable cross‐linkers

Oprea

Potolinca

Oprea

2021

J of Applied Polymer Sci

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The novelty of the poly(urethane-urea) series consists in inclusion of odianisidine units in the main chain and cross-linking with renewable biomaterials, unused compounds so far in the synthesis of the poly(urethane-urea) (Tween 20, Span 20, Phloroglucinol). The effects of these components on the structure, surface, thermo-mechanical properties and dielectric behavior of the obtained poly(urethane-urea) were investigated by Fourier transform infrared (FTIR) spectroscopy, thermo-gravimetric analysis, static contact angles, broadband dielectric spectroscopy, and mechanical testing. The FTIR spectra showed that the urethane hydrogen bonds decreased with the increase of odianisidine content. Such that, at the increase of the o-dianisidine content, decreased the thermo-mechanical properties, and increased strongly the water contact angle from 83 to 108. By dielectric relaxation spectroscopy was studied the molecular dynamics within the polymeric matrices with identical soft segments but different structure of the hard domains. These poly(urethane-urea) materials exhibit two secondary relaxations (β and γ) and a relaxation process α, corresponding to the segmental movements in the soft phase, which occurs around the temperature of −50 C independent of the measurement frequency. o-Dianisidine prevents the formation of all the urethane hydrogen bonds and so increases the chains mobility and dipoles polarization of polymer matrix, thus increasing the dielectric constants.

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Optimization of mechanical and dielectric properties of poly(urethane–urea)-based dielectric elastomers via the control of microstructure

Abstract: In this work, we fabricated hydroxyl-terminated butadiene–acrylonitrile copolymer-based poly(urethane–urea) dielectric elastomers, and investigated the relationship between multi-length scale structure and dielectric, mechanical properties.

Cited by 22 publications

References 39 publications

Synthesis of cross-linked polyurethane elastomers with the inclusion of polar-aromatic moieties (BA, PNBA and 3, 5-DNBA): Electrical and thermo-mechanical properties analysis

Synthesis of cross-linked polyurethane elastomers with the inclusion of polar-aromatic moieties (BA, PNBA and 3, 5-DNBA): Electrical and thermo-mechanical properties analysis

Modulation and mechanism of spatial structure for multi-layer cyanate ester resin composites to achieve remarkably increased energy storage density and decreased dielectric loss

Physical properties and dielectric behavior of the poly(urethane‐urea) based on o‐dianisidine and renewable cross‐linkers

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