Highly stretchable, bionic self-healing waterborne polyurethane elastic film enabled by multiple hydrogen bonds for flexible strain sensors

Zhang, Ending; Liu, Xiaohong; Liu, Yingchun; Shi, Jun; Li, Xiaobin; Xiong, Xiang; Xu, Chaochao; Wu, Kun; Lu, Mangeng

doi:10.1039/d1ta05148b

Cited by 60 publications

(36 citation statements)

References 59 publications

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“…After being incorporated into the polymer network, this unique structure of castor oil led to the formation of dangling chains and network defects. These phenomena were also reported previously by other research groups. − The glass transition temperature ( T g ) values of the polyurethane films were obtained from the temperature corresponding to the peak of the tan δ curves. − When the molar ratios between amine groups of RN and the OH groups of castor oil increased from 0:10 to 5:5, the T g values of samples exhibited an increase from −40.8 to 37.6 °C. The similar trend of the T g was obtained from DSC as a function of temperature (Figure c).…”

Section: Resultssupporting

confidence: 79%

Scalable Production of Self-Toughening Plant Oil-Based Polyurethane Elastomers with Multistimuli-Responsive Functionalities

Xie

Deng

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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Plant oils are becoming of high industrial importance due to the persisting challenges befalling with the utilization of fossil fuels. Thus, developing methodologies to produce multifunctional materials by taking advantage of the unique structure of plant oil is highly desired. In this study, castor oil served as a cross-linker and soft segments, by incorporating scalable rhodamine 6G derivatives, to systematically synthesize a series of smart polymers that possess self-toughening and multistimuli-responsive capabilities. The polyurethane elastomers showed 10 times and 60 times increases in tensile strength and toughness, respectively, in comparison with the unmodified polyurethane due to the existence of large amounts of hydrogen bonding, dynamic C−N spiro bonds, rigid benzene ring, and high cross-link densities. The novel polyurethane elastomers exhibited excellent reversible multichromic behaviors in response to light, pH, and mechanics. Notably, the resulting polyurethane elastomers exhibited ultrasensitive sustained photochromism with tunable white emission and rapid reversibility. This study provides a simple and effective strategy to utilize plant oil for multifunctional material preparation and paves the way to open access for application of plant oil-based products in a variety of industry applications, such as sensors, self-fitting tissue scaffolds, and switchable devices.

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Section: Resultssupporting

confidence: 79%

Scalable Production of Self-Toughening Plant Oil-Based Polyurethane Elastomers with Multistimuli-Responsive Functionalities

Xie

Deng

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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“…[36] The absorption peak at 1712 cm À1 is assigned to C=O groups of -CONHin the PU chains, indicating the successful syntheses of the PU polymer. [30,37] IU was the physical crosslinking site in the system that increased the tensile strength of the material. The multiple hydrogen bonds in the IU structure and ionic bonds were first dissociated due to energy dissipation, and then the mechanical properties of the material were restored by the recombination of the multiple hydrogen bonds and ionic bonds.…”

Section: Design Strategy and Microstructure Of The Wpu/emim:dca Ionogelsmentioning

confidence: 99%

“…[ 28,29 ] In addition, the multiple hydrogen bonds combined into microdomains can provide strong bonding energy thus enhancing the strength of the material. [ 30,31 ] Song et al [ 32 ] proposed the construction of high‐strength, high‐toughness elastomers from the hydrogen bonding interactions of 2‐ureido‐4[1H]‐pyrimidione (UPy). However, the introduction of UPy usually requires a complicated chemical modification before introducing into the polymer system.…”

Section: Introductionmentioning

confidence: 99%

High strength, self‐healing, and anti‐freezing polyurethane ionogel based on multiple hydrogen bonding for wearable strain sensor

Xiao

Wang

et al. 2022

Polymer Engineering & Sci

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Hydrogel-based electronic skin sensors often suffer from low mechanical properties, poor durability, and low temperature resistance. Herein, an ionogel was fabricated by casting the water-borne polyurethane (WPU) and 1-ethyl-3-methylimidazoliumdicyanamide (EMIM:DCA). The imidazolidinyl urea with multiple hydrogen bonds as chain extenders was introduced into WPU systems. Owing to the multiple hydrogen bonds, the ionogels exhibited good mechanical properties with a tensile stress of 1.45-12.09 MPa, a strain of 730%-860%, and good resilience. Moreover, the mechanical properties, conductivity, and sensing ability of the ionogels could be conveniently healed with the assistance of heat. EMIM:DCA endowed the ionogels with excellent ionic conductivity at room temperature (1.8-246 μS cm À1 ). In addition, due to the low vapor pressure of EMIM:DCA, the ionogel exhibited excellent antifreezing property at À20 C. The ionogel can be assembled into a sensor to monitor the movements of human body with good responsiveness and stability.

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“…On the other hand, the introduction of HTF replaces part of the disul de bond. Although the content of the disul de bond is reduced, the introduction of HTF increases the degree of hydrogen bonding of polyurethane, and Studies have shown that the existence of dynamic hydrogen bonding will promote the healing process of polyurethane [39][40][41]. Figure 5b shows the properties of the FT-IR spectral bands of the vibrations of the C = O group in SFPUHE-HTF.…”

Section: Self-repair Performance and Repair Mechanism Of Sfpuhe-htf A...mentioning

confidence: 99%

Self-healing, Solvent-free Anti-corrosion Coating based on Skin-like polyurethane/carbon nanotubes Composite with Real-time Damage Monitoring

Kong

Luo

Zhang

et al. 2022

Preprint

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Self-healing anti-corrosion coatings are widely regarded as a promising long-term corrosion protection strategy, and it is even more significant if the coating damage can be monitored in real-time and thus repaired. Inspired by the hierarchical structure of human skin, a self-healing solvent-free polyurethane/carbon nanotubes coating (SFPUHE-HTF-CNTs) with a skin-like bilayer structure was constructed by scraping and spraying techniques. The SFPUHE-HTF-CNTs is composed of a self-healing functional layer and a corrosion protection layer. In detail, the hydrophobic solvent-free polyurethane (SFPUHE-HTF) containing disulfide bonds and fluorinated polysiloxane chain segments consists of the self-healing functional layer, and the CNTs with good electrical conductivity consist of the corrosion protection layer, which also allows real-time monitoring of coating damage. SFPUHE-HTF-CNTs can self-repair cracks when heated at 60 ℃ for 16 min or irradiated with UV light at the energy of 200 for 48 h. The results of corrosion protection experiments indicate that the coating has a low corrosion current density (8.94×10− 9 A·cm− 2), a positive corrosion potential (-0.38 V) and a high impedance modulus (|Z|=4.79×105 Ω·cm2). The impedance modulus could still reach 4.54×104 Ω·cm2 after self-healing, showing excellent self-healing properties for anti-corrosion protection. Synchronously, SFPUHE-HTF-CNTs exhibits satisfying damage sensing performance, enabling real-time monitoring of fractures at different sizes. This work realized the effective combination of self-healing performance and corrosion protection and real-time damage monitoring function through bionic design, and completed the simple, green, low-cost and rapid preparation of multi-functional self-healing coating, which has the advantage of scale production.

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Highly stretchable, bionic self-healing waterborne polyurethane elastic film enabled by multiple hydrogen bonds for flexible strain sensors

Abstract: Flexible elastomer material with high stretchability and self-healing performance is the preferred substrates for preparing multi-function flexible sensors and bionic electronic skin. However, it is still a great challenge to...

Cited by 60 publications

References 59 publications

Scalable Production of Self-Toughening Plant Oil-Based Polyurethane Elastomers with Multistimuli-Responsive Functionalities

Scalable Production of Self-Toughening Plant Oil-Based Polyurethane Elastomers with Multistimuli-Responsive Functionalities

High strength, self‐healing, and anti‐freezing polyurethane ionogel based on multiple hydrogen bonding for wearable strain sensor

Self-healing, Solvent-free Anti-corrosion Coating based on Skin-like polyurethane/carbon nanotubes Composite with Real-time Damage Monitoring

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