Self‐healing supramolecular waterborne polyurethane dispersions with quadruple hydrogen bonds in main chain

Yang, Zhiyuan; Sun, Dalin

doi:10.1002/app.49413

Cited by 34 publications

(21 citation statements)

References 43 publications

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“…The healing time of scratch was inversely proportional to the content of quadruple hydrogen bonds (the shortest healing time at 80 °C is 2.5 h), while the mechanical properties of the repaired film could be restored to more than 90%. [55] In addition to main chains, UPy units can also be chemically attached to the side chain or capped on the ends of polymers (Figure 2b). [56] Li et al synthesized a self-healing polyurethane that could maintain a tensile strength of 44 MPa and a toughness of 345 MJ m -3 .…”

Section: Hydrogen Bondsmentioning

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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Section: Hydrogen Bondsmentioning

confidence: 99%

A Short Review on Self‐Healing Thermoplastic Polyurethanes

Yao

Xiao

Liu

2021

Macro Chemistry & Physics

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“…The repair process is shown in the figure2. Yang [15] . The self-healing time of the scratched film is inversely proportional to the content of HMA, and the mechanical properties can be restored to more than 90% in 2.5h at 80℃.…”

Section: Main-chain Self-healing Polymermentioning

confidence: 99%

Recent developments: self-healing polymers based on quadruple hydrogen bonds

Zhang

Sun

Li³

2021

E3S Web Conf.

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The microcrack of materials was inevitable in the process of transportation, storage and utilization, which may cause functional failure and resources waste. Inspired by nature, self-healing polymers have attracted significant attention owing to widespread applications in wearable electronics, cartilage replacement, coatings and elastomer. Compared with extrinsic healing, intrinsically healable polymers offer multiple self-healing by supramolecular reversible interactions, such as host-guest interactions, π-π stacking, ionic interactions and hydrogen-bonding. Self-healing polymers based on quadruple hydrogen bonds have been extensively investigated due to its high thermodynamic stability and rapid kinetic reversibility, and have been well developed for the past two decades. In this paper, the strategies and designs of self-repairing polymers based on quadruple hydrogen bond were classified and summarized, including main-chain self-healing polymers, side-chain self-healing polymers and supramolecular self-healing polymers. It is expected that quadruple hydrogen bonding can be construct more robust, highly tough, multi-stimuli-responsive, and fast self-healing supramolecular polymer, and is potential to be applied to numerous civilian and military fields in the future.

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“…Hydrogen bonded dimerization of ureidopyrimidone (UPy) monomer was first reported by Meijer [69,70] and has been used in numerous supramolecular polymers with distinct properties and applications. UPy motifs that dimerize strongly via quadruple hydrogen bonds have been demonstrated to synthesize self-healing materials [71][72][73][74][75]. Ren Liu et al [76] introduced a combined system where curing was achieved through UV irradiation and self-healing through UPy based dynamic quadrupolar hydrogen bonds.…”

Section: Ureidopyrimidone (Upy) Based Self-healing Coatingmentioning

confidence: 99%

A Brief Overview on Preparation of Self-Healing Polymers and Coatings via Hydrogen Bonding Interactions

Gadwal

2020

Macromol

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Self-healing coatings or materials have received significant importance in paint, coating, and other industries, as well as in academia, because of their capability to extend materials service life, improving protection, and ensuring sustainability. This review article emphasizes significant advances accomplished in the preparation and properties of intrinsic self-healing materials exclusively based on hydrogen bonding interactions, with possible applications in coatings and adhesives. The main topic of discussion in this review article is the preparation, healing conditions, healing efficiency, and mechanical property recovery after healing. The last part of the review discusses the conclusions and outlook of self-healing materials.

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Self‐healing supramolecular waterborne polyurethane dispersions with quadruple hydrogen bonds in main chain

Cited by 34 publications

References 43 publications

A Short Review on Self‐Healing Thermoplastic Polyurethanes

A Short Review on Self‐Healing Thermoplastic Polyurethanes

Recent developments: self-healing polymers based on quadruple hydrogen bonds

A Brief Overview on Preparation of Self-Healing Polymers and Coatings via Hydrogen Bonding Interactions

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