Highly stretchable, tough, healable and mechanoresponsive polyurethane elastomers for flexible capacitor applications

Khan, Ayaz Ahmad; Wang, Chuanfu; Kisannagar, Ravinder Reddy; Chuang, Wei‐Tsung; Nhien, Pham Quoc; Mahmood, Sadiq; Katiyar, Monica; Gupta, Dipti; Wei, Kung‐Hwa; Lin, Hong‐Cheu

doi:10.1039/d2ta06541j

Cited by 19 publications

(5 citation statements)

References 43 publications

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“…Such pressure sensors based on microphase‐separated dielectric gels show low detection limit and wide working range, as indicated in Figure 4g and Table S3 (Supporting Information), significantly improved from the previously reported polymer‐based sensors. [ 32–52 ] With excellent dielectric properties at wide temperature range, the sensors based on microphase‐separated dielectric gels can also sense small and large pressures in both low and high temperatures, as shown in Figure 4h–k, demonstrating the good practicality. The good repeatability, sensitivity, and wide sensing range of the pressure sensors satisfy requirements in many practical and industrial applications.…”

Section: Resultsmentioning

confidence: 99%

Dielectric Gels with Microphase Separation for Wide‐Range and Self‐Damping Pressure Sensing

Zhang,

Wang,

Zhu

et al. 2023

Advanced Materials

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Omnipresent vibrations pose a significant challenge to flexible pressure sensors by inducing unstable output signals and curtailing their operational lifespan. Conventional soft sensing materials possess adequate elasticity but prove inadequate in countering vibrations. Moreover, the utilization of conventional highly‐damping materials for sensing is challenging due to their substantial hysteresis. To tackle this dilemma, dielectric gels with controlled in situ microphase separation have been developed, leveraging the miscibility disparity between copolymers and solvents. The resulting gels exhibit exceptional compression stress, remarkable dielectric constant, and exceptional damping capabilities. Furthermore, flexible pressure sensors based on these microphase‐separated gels show a wide detection range and low detection limit, more importantly, excellent sensing performance on vibrating surfaces. This work offers high potentials for applying flexible pressure sensors in complex practical scenarios and opens up new avenues for applications in soft electronics, biomimetic robots, and intelligent sensing.

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Section: Resultsmentioning

confidence: 99%

Dielectric Gels with Microphase Separation for Wide‐Range and Self‐Damping Pressure Sensing

Zhang,

Wang,

Zhu

et al. 2023

Advanced Materials

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“…It should be noted that the lower tensile strength of V 1:1.2 compared to V 1:1 is also attributed to the presence of free amine in the covalent network of V 1:1.2 , which reduces the degree of cross‐linking. The comprehensive performance of other reported existing samples is shown in Table 2 38–45 …”

Section: Resultsmentioning

confidence: 99%

Preparation and self‐healing properties of epoxy vitrimer materials based on imine bonds

Yan,

Jiang,

Pang

et al. 2024

J of Applied Polymer Sci

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Vitrimer materials have machinability and stability because of their shape remodeling and self‐healing properties at high temperatures. This article reports the synthesis of epoxy resin using vanillin, p‐aminophenol, and epichlorohydrin as raw materials, and polyetheramine‐400 as a curing agent. To study the effect of free amine on the mechanical and self‐healing properties, two materials with epoxy and amine stoichiometric ratios of 1:1 and 1:1.2 were studied, respectively. The experimental results show that when the molar ratio of epoxy to amine stoichiometric is 1:1.2 (V1:1.2), the tensile strength of vitrimer materials can reach 5.4 MPa and the self‐healing efficiency can reach 99.5% after 6 h of healing at 120°C. When the molar ratio is 1:1 (V1:1), the obtained epoxy material has a higher tensile strength of 9.5 MPa. After 24 h of healing at 120°C, the self‐healing efficiency can reach 83.4%. In addition, epoxy vitrimer materials can be remodeled at 120°C, and the self‐healing and mechanical properties are not influenced after remodeling. This work proposes a novel preparation method for epoxy vitrimer materials, which is beneficial to the development of high‐strength remodelable self‐healing materials.

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“…Chalcogen elements, including S, Se and Te in the group 6A of the periodic table and sometimes O, have been discovered to be capable of undergoing various dynamic interactions, including chalcogen bonding, 30 coordinate bonding, dynamic chalcogenchalcogen bond, [31][32][33][34][35][36] etc. By using external stimuli to control these dynamic interactions, functional molecules and materials with specific stimuli-responsiveness can be achieved in both artificial [37][38][39][40][41][42][43][44] and natural systems.…”

Section: Yizheng Tanmentioning

confidence: 99%

Mechanochemistry of dynamic chalcogen-containing polymers: a minireview

Cao

Tan

2023

New J. Chem.

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Highly stretchable, tough, healable and mechanoresponsive polyurethane elastomers for flexible capacitor applications

Abstract: The visualizing color changes upon mechanical force in elastomers is attractive to understand stress transfer and failure mechanism, which are valuable for the applications from tamper-proof packaging to structural integrity...

Cited by 19 publications

References 43 publications

Dielectric Gels with Microphase Separation for Wide‐Range and Self‐Damping Pressure Sensing

Dielectric Gels with Microphase Separation for Wide‐Range and Self‐Damping Pressure Sensing

Preparation and self‐healing properties of epoxy vitrimer materials based on imine bonds

Mechanochemistry of dynamic chalcogen-containing polymers: a minireview

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