Self-healing supramolecular waterborne polyurethane based on host–guest interactions and multiple hydrogen bonds

Xiao, Luqi; Shi, Jun; Wu, Kun; Lu, Mangeng

doi:10.1016/j.reactfunctpolym.2020.104482

Cited by 56 publications

(21 citation statements)

References 44 publications

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“…In PU, two other mechanisms together with hydrogen bonds have also been reported: host-guest interactions and van der Waals forces, with very different results. Xiao et al 180 designed a network based on the combination of host-guest interactions and multiple hydrogen bonds in waterborne PU (WBPU), an environmentally friendly option that decreases the effect of the release of volatile organic components into the atmosphere. They reported a tensile strength of 11.07 MPa and efficiency of 93%, close to the work described above with metal-ligand coordination, but at a temperature of 100 1C.…”

Section: Successfully Combinedmentioning

confidence: 99%

Evolution of self-healing elastomers, from extrinsic to combined intrinsic mechanisms: a review

et al. 2020

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Section: Successfully Combinedmentioning

confidence: 99%

Evolution of self-healing elastomers, from extrinsic to combined intrinsic mechanisms: a review

et al. 2020

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“…Lu et al introduced the methylated β-cyclodextrin (β-CD) into the main chain of WPU, which was able to enhance the mechanical properties of WPU and synergize with UPy to enhance the performance of self-healing samples. [73] Different from the work described above with connecting CD to the main chain, Chen et al added poly(ethylene glycol) modified β-CD to a self-healing WPU through a solution blending method. When the mass fraction of CD was lower than 5%, the mechanical and self-healing property of the nanocomposites were improved.…”

Section: Host-guest Interactionsmentioning

confidence: 99%

A Short Review on Self‐Healing Thermoplastic Polyurethanes

Yao

Xiao

Liu

2021

Macro Chemistry & Physics

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of self-healing will happen only by satisfying four factors: location, temporality, mobility, [17] and intermolecular interaction. The surface of the damaged part needs to contact with each other properly and the dynamic interaction requires time to reform. Self-healing TPUs can be used as coatings, [18] adhesives, [19] biomedical materials, [20] wearable electronics, [21] and this self-healing property can extend the service life and reduce waste. Early selfhealing materials were design to employ encapsulated external healing agents. [22] With conceptualization and development, the classification of healing agents comprises three types: microcapsules, [23,24] hollow fibers, [25,26] and microvascular networks. [27] Limited by the supply of healing agents, multiple cycle repairs cannot be achieved; in addition, the microcontainers may be harmful to the regular service of the matrix, which change the inherent properties of the matrix, fail to respond quickly and cause the healing agent to flow out when the matrix is damaged. To overcome these restrictions, research on self-healing polymers has focused on the incorporation of self-healing mechanism directly in the material by introducing dynamic bonds or interactions (covalent or non-covalent) that can break and reform in a perpetual manner upon appropriate stimuli. The dynamic non-covalent interactions like hydrogen bond, [28,29] shape-memory assisted self-healing, [30,31] host-guest interaction, [32,33] and metal-ligand coordination [34,35] primarily influence the self-healing efficiency. The dynamic covalent bonds such as Diels-Alder bonds, [36,37] disulfide bonds, [38,39] diselenide bonds, [40,41] and ditelluride bonds [42] exert a major effect on the mechanical property of self-healing polyurethanes. However, there is a contradiction between self-healing efficiency and mechanical property. It is challenging to obtain a material with both remarkable mechanical strengths and a high self-healing efficiency. Interest in homogeneous self-healing materials has been growing because they do not need to be combined with therapeutic agents, which avoids many thorny issues including complicated pre-embedding processes, compatibility, and controlled and sustained release. For healing agents-assisted self-healing materials, they are usually thermosetting, and an obvious limitation is that they only support one self-healing cycle. [43] Self-healing elastomers can achieve repair through dynamic molecular interactions between the damaged surface. In this article, we only focus on self-healing TPU elastomer mechanism based on dynamic covalent or non-covalent bonds. Self-healing polyurethanes based on external healing agents are outside the scope of this article.Thermoplastic polyurethane (TPU) is a melt-processing polymer with a high elasticity, high tensile strength, low-temperature resistance, wear-resistance, and corrosion resistance ability. TPU can be used in the automotive industry, electronics, medical supplies, coatings, and sports equipment. Introduction of self-healin...

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“…Due to the PU molecular chains contain lots of hard segments and soft segments, the performance about strength and flexible was usually excellent. [18,23] Hence, the PU was expected to improve the mechanical property of hydrogel. The carboxylate ions(-COO − )on PU chains lead to dispersion of PU in water.…”

Section: Design Principle and Preparation Of Xpusam Hydrogelsmentioning

confidence: 99%

“…As so far we know, waterborne polyurethane, consisting of hydrophobic backbone and emulsifier (2, 2-bis(hydroxymethyl)propionic acid, DMPA), had good biocompatibility and high mechanical properties, it could be used as a polymer reinforcement. [15][16][17][18] Besides, what most people do not notice was that its molecular chain contains a large number of carboxyl anions similar to cellulose nanofiber, the latter had been reported to enhance ion conductivity by promoting counterion migration. [19] Therefore, we hoped that PU could be used to simultaneously promote the mechanical strength and ionic conductivity of hydrogel.…”

Section: Introductionmentioning

confidence: 99%

Waterborne Polyurethane Enhanced, Adhesive, and Ionic Conductive Hydrogel for Multifunctional Sensors

Zhang

Shi

et al. 2021

Macromol. Rapid Commun.

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In the past two decades, ionic conductive hydrogel has attracted tremendous research interests for their intrinsic characteristics in the field of flexible sensor. However, synchronous achievement of high mechanical strength, satisfied ionic conductivity, and broad adhesion to various substrates is still a challenge. Herein, a novel zwitterionic composite hydrogel that displayed excited strechability (up to 900%), satisfied strength (about 30 kPa), high ionic conductivity (1.2 mS cm−1), and adhesion to polar and nonpolar materials is fabricated though the combination of waterborne polyurethanes (PU) and poly(sulfobetaine zwitterion‐co‐acrylamide) (SAm). Especially, this facile strategy demonstrates that PU has a synergistic effect on enhancing mechanical strength and ionic conductivity for ionic conductive hydrogel. Moreover, the hydrogel‐based strain/stress sensor shows high sensitivity, wide sensing range, great stability, and accuracy for human body movements detecting and voice recognition. This novel ionic conductive hydrogel has promoted the development of wearable devices.

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Self-healing supramolecular waterborne polyurethane based on host–guest interactions and multiple hydrogen bonds

Cited by 56 publications

References 44 publications

Evolution of self-healing elastomers, from extrinsic to combined intrinsic mechanisms: a review

Evolution of self-healing elastomers, from extrinsic to combined intrinsic mechanisms: a review

A Short Review on Self‐Healing Thermoplastic Polyurethanes

Waterborne Polyurethane Enhanced, Adhesive, and Ionic Conductive Hydrogel for Multifunctional Sensors

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