A polyurethane integrating self-healing, anti-aging and controlled degradation for durable and eco-friendly E-skin

Li, Fenglong; Xu, Zong; Hu, Han; Kong, Zhengyang; Chen, Chao; Tian, Ying; Zhang, Wenwu; Ying, Wu; Zhang, Ruoyu; Zhu, Jin

doi:10.1016/j.cej.2020.128363

Cited by 68 publications

(34 citation statements)

References 57 publications

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“…Zhu et al used polyurethane as a flexible substrate and carbon nanotubes as a stress sensor to prepare an e-skin, which is anti-aging and self-healing at room temperature. [14] However, there are relatively few reports of overall self-repairing e-skins.…”

Section: Introductionmentioning

confidence: 99%

A Puncture‐Resistant and Self‐Healing Conductive Gel for Multifunctional Electronic Skin

Hou

Zhao

Wang

et al. 2021

Adv Funct Materials

104

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Flexible electronic skins (e-skins) play a very important role in the development of human-machine interaction and wearable devices. To fully mimic the functions of human skin, e-skins should be able to perceive multiple external stimuli (such as temperature, touch, and friction) and be resistant to injury. However, both objectives are highly challenging. The fabrication of multifunctional e-skins is difficult because of the complex lamination scheme and the integration of different sensors. The design of skin-like materials is hindered by the trade-off problem between flexibility, toughness, and selfhealing ability. Herein, flexible sodium methallyl sulfonate functionalized poly(thioctic acid) polymer chains are combined with rigid conductive polyaniline rods through ionic bonds to obtain a solvent-free polymer conductive gel. The conductive gel has a modulus similar to that of skin, and shows good flexibility, puncture-resistance, notch-insensitivity, and fast self-healing ability. Moreover, this conductive gel can convert changes in temperature and strain into electrical signal changes, thus leading to multifunctional sensing performance. Based on these superior properties, a flexible e-skin sensor is prepared, demonstrating its great potential in the wearable field and physiological signal detection.

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Section: Introductionmentioning

confidence: 99%

A Puncture‐Resistant and Self‐Healing Conductive Gel for Multifunctional Electronic Skin

Hou

Zhao

Wang

et al. 2021

Adv Funct Materials

104

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“…Hence, polycaprolactone diol (PCL) with crystallizable segments could be applied as the preferred precursor of further polyurethane (PU) synthesis. Moreover, the ester bonds originated from PCL on the main chain could be decomposed by a hydrolytic or enzymatic process, which helped to promote the degradability and recyclability and reduce the threats to the environment from electronic waste to some extent. , …”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the ester bonds originated from PCL on the main chain could be decomposed by a hydrolytic or enzymatic process, which helped to promote the degradability and recyclability and reduce the threats to the environment from electronic waste to some extent. 27,28 An increasing number of studies on aliphatic hard segments using hexamethylene diisocyanate (HDI) and 1,4-butanediol (or 1,6-hexanediol) reported that the aliphatic PU chains could form better-ordered structures and generate large crystallized domains due to their better proximity, which is responsible for improved mechanical properties. 29−31 The ultimate properties 32 of polyurethanes, including toughness and self-healing ability, are determined by hierarchical structures, like the microphase separation and crystallization, which can be turned by minor changes in chain extenders.…”

Section: Introductionmentioning

confidence: 99%

High Toughness Polyurethane toward Artificial Muscles, Tuned by Mixing Dynamic Hard Domains

et al. 2021

Macromolecules

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Developing multiphase polyurethanes (PUs) with loosely packed domains containing dynamic linkages and appropriately crystallized soft phases composed of polycaprolactone diol (PCL) segments is effective for the trade-off between toughness and self-healing. Here, we proposed a new strategy based on mixed dynamic hard segments to achieve the goal and improve self-healing behavior and mechanical performance. The designed polyurethanes comprise a microphase-separated structure with polycaprolactone diol as soft segments, which are facilitated to store entropy energy under strain. The aromatic disulfides together with aliphatic chain extenders were selected as hard segments to adjust the hierarchical structures, including microphase separation and crystallinity. The reversible hydrogen bonds and disulfide bonds distributed in the polymer network contribute to enhancing stretchability and self-healing performance. In this research, the robust polyurethanes with uniform microphase separation structures and insufficient crystallinity were designed by mixing a dynamic hard domain, which exhibits the potential application in the field of flexible conductors and synthetic muscles; the recovery efficiency at 90 °C is 93.8% and the ultimate stress/strain are 18.7 ± 0.2 MPa/2253 ± 149.2%. This work confirmed that the feasibility of synthetic PUs by changing the mole ratio of dual chain extenders simply, which is also expected to inspire the related fields of engineering, may require polymers with excellent self-healing efficiency and extraordinary robustness simultaneously.

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“…Elastomers are widely used in various fields such as tires, biomaterials, seals, wearable electronic devices, soft robots, sensors, and other fields [ 1 , 2 , 3 , 4 ]. These require elastomers with high mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Mechanically Robust Dual-Crosslinking Elastomer Enabled by a Facile Self-Crosslinking Approach

Huang

Jin

et al. 2022

Materials

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We propose a simple but rapid strategy to fabricate self-crosslinked dual-crosslinking elastomers (SCDCEs) with high mechanical properties. The SCDCEs are synthesized through one-pot copolymerization of Butyl acrylate (BA), acrylic amide (AM), and 3-Methacryloxypropyltrimethoxysilane (MEMO). Both the amino group on AM and the methoxy group on MEMO can be self-crosslinked after polymerization to form a dual-network crosslink consisting of hydrogen bonds crosslink and Si-O-Si covalent bonds crosslink. The SCDC endow optimal elastomer with high mechanical properties (the tensile strength is 6MPa and elongation at break is 490%) as the hydrogen bonds crosslink can serve as sacrificial construction to dissipate stress energy, while covalent crosslinking networks can ensure the elasticity and strength of the material. These two networks also contribute to the recoverability of the elastomers, leading them to recover their original shape and mechanical properties after being subjected to deformation in a short time.

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A polyurethane integrating self-healing, anti-aging and controlled degradation for durable and eco-friendly E-skin

Cited by 68 publications

References 57 publications

A Puncture‐Resistant and Self‐Healing Conductive Gel for Multifunctional Electronic Skin

A Puncture‐Resistant and Self‐Healing Conductive Gel for Multifunctional Electronic Skin

High Toughness Polyurethane toward Artificial Muscles, Tuned by Mixing Dynamic Hard Domains

Mechanically Robust Dual-Crosslinking Elastomer Enabled by a Facile Self-Crosslinking Approach

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