Self-healing, anti-freezing and highly stretchable polyurethane ionogel as ionic skin for wireless strain sensing

Xu, Junhuai; Wang, Hui; Du, Xiaosheng; Cheng, Xu; Du, Zongliang; Wang, Haibo

doi:10.1016/j.cej.2021.130724

Cited by 81 publications

(72 citation statements)

References 43 publications

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“…The combination of ILs and polyurethane could generate ionogels and serve as flexible strain sensors. 11–14 Gou et al reported a supramolecular ionogel with high mechanical performance, which is fabricated by an amphiphilic poly(urethane-urea) copolymer and IL. 15 Furthermore, the results demonstrated that the mechanical properties have been enhanced after introducing lignin into the PU prepolymer.…”

Section: Introductionmentioning

confidence: 99%

“…The healing behavior can be realized autonomously through the reversibility of dynamic covalent bonds. 19,20 Due to the low bond energy of disulfide bonds, the broken disulfide bonds would facilely re-form in mild conditions. It is this facile reversible transformation that has led to the widespread application of disulfide bonds in the design of self-healing materials.…”

Section: Introductionmentioning

confidence: 99%

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Highly stretchable, self-healable, and self-adhesive ionogels with efficient antibacterial performances for a highly sensitive wearable strain sensor

Wang

et al. 2022

J. Mater. Chem. B

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Highly stretchable, self-healable, and self-adhesive ionogels with efficient antibacterial performances for a highly sensitive wearable strain sensor

Wang

et al. 2022

J. Mater. Chem. B

Self Cite

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“…Besides, remote monitoring could be realized via wireless communication, as shown in Figure 13C. 126 The software in smart phone could be employed to record the variation of resistance in real time to monitor various daily movements of human body, demonstrating that such hydrogel sensor has great potential in remote healthcare monitoring. For example, Liao et al 127 illustrated a kind of soft human motion sensor for wirelessly monitoring of human activities by connecting it to mobile phone.…”

Section: In Vitro Monitoringmentioning

confidence: 99%

Recent progress in conductive self‐healing hydrogels for flexible sensors

Tao

Liao

et al. 2022

Journal of Polymer Science

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Flexible sensors have great potential in the application of wearable and implantable devices, and conductive hydrogels have been widely used in wearable sensing devices due to their biomimetic structure, biocompatibility, adjustable transparency and stimuli-responsive electrical properties. Conventional conductive hydrogels are prone to be damaged in their application process and lack of long-term reliability. Inspired by natural organisms such as mussels, introduction of self-healing capabilities has been regarded as a promising approach to extend the service life of hydrogel sensing devices. This work

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“…Healable and reprocessable gelatine ionogels based on the reversible exchange of imine bonds have been designed for flexible supercapacitors [ 21 ]. Xu et al reported polyurethane (PU) ionogels that can be readily healed at room temperature and restore their original performance owing to the dynamic boronic ester crosslinker used in the polymer network [ 22 ]. The exchange reactions between boronic ester linkages do not generally need a catalyst, initiator, or elevated temperature, and the activation energy of this exchange is relatively low.…”

Section: Introductionmentioning

confidence: 99%

Photopolymerizable Ionogel with Healable Properties Based on Dioxaborolane Vitrimer Chemistry

Nguyen

Vancaeyzeele

et al. 2022

Gels

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Ionogels are solid polymer gel networks loaded with ionic liquid (IL) percolating throughout each other, giving rise to ionically conducting solid electrolytes. They combine the mechanical properties of polymer networks with the ionic conductivity, non-volatility, and non-flammability of ILs. In the frame of their applications in electrochemical-based flexible electronics, ionogels are usually subjected to repeated deformation, making them susceptible to damage. It appears critical to devise a simple and effective strategy to improve their durability and lifespan by imparting them with healing ability through vitrimer chemistry. In this work, we report the original in situ synthesis of polythioether (PTE)-based vitrimer ionogels using fast photopolymerization through thiol-acrylate Michael addition. PTE-based vitrimer was prepared with a constant amount of the trithiol crosslinker and varied proportions of static dithiol spacers and dynamic chain extender BDB containing dynamic exchangeable boronic ester groups. The dynamic ionogels were prepared using 50 wt% of either 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide or 1-Ethyl-3-methylimidazolium trifluoromethanesulfonate, both of which were selected for their high ionic conductivity. They are completely amorphous (Tg below −30 °C), suggesting they can be used at low temperatures. They are stretchable with an elongation at break around 60%, soft with Young’s modulus between 0.4 and 0.6 MPa, and they have high ionic conductivities for solid state electrolytes in the order of 10−4 S·cm−1 at room temperature. They display dynamic properties typical of the vitrimer network, such as stress relaxation and healing, retained despite the large quantity of IL. The design concept illustrated in this work further enlarges the library of vitrimer ionogels and could potentially open a new path for the development of more sustainable, flexible electrochemical-based electronics with extended service life through repair or reprocessing.

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Self-healing, anti-freezing and highly stretchable polyurethane ionogel as ionic skin for wireless strain sensing

Cited by 81 publications

References 43 publications

Highly stretchable, self-healable, and self-adhesive ionogels with efficient antibacterial performances for a highly sensitive wearable strain sensor

Highly stretchable, self-healable, and self-adhesive ionogels with efficient antibacterial performances for a highly sensitive wearable strain sensor

Recent progress in conductive self‐healing hydrogels for flexible sensors

Photopolymerizable Ionogel with Healable Properties Based on Dioxaborolane Vitrimer Chemistry

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