Self-Healing Thermoplastic Polyurethane Linked via Host-Guest Interactions

Jin, C.; Sinawang, Garry; Osaki, Motofumi; Zheng, Yongtai; Yamaguchi, Hiroyasu; Harada, Akira; Takashima, Yoshinori

doi:10.3390/polym12061393

Cited by 39 publications

(26 citation statements)

References 66 publications

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“…a) Stress–strain curves of the notched DA‐PU self‐healing at 60 °C for different periods; b) cyclic tensile test of self‐healed DA‐PU at 100% strain for 1000 times; c) macroscopic demonstration of self‐healing and toughness: DA‐PU (≈1 mm thickness) was cut into two pieces, followed by the self‐healing at 60 °C and subjecting to a 5 kg dumbbell lifting test (DA‐PU/dumbbell = 1/5000, wt/wt); d) comparison of the stretching strain, toughness, and self‐healing temperature of DA‐PU with other reported self‐healing polymers in recent 3 years. (1, [ 22 ] 2, [ 23 ] 3, [ 24 ] 4, [ 25 ] 5, [ 26 ] 6, [ 8d ] 7, [ 27 ] 8, [ 28 ] 9, [ 29 ] 10, [ 30 ] 11, [ 31 ] 12, [ 9 ] 13, [ 32 ] 14, [ 33 ] 15, [ 34 ] 16 [ 35 ] ).…”

Section: Resultsmentioning

confidence: 99%

A Biologically Muscle‐Inspired Polyurethane with Super‐Tough, Thermal Reparable and Self‐Healing Capabilities for Stretchable Electronics

Ying

Wang

Kong

et al. 2021

Adv Funct Materials

127

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Polymeric elastomers play an increasingly important role in the development of stretchable electronics. A highly demanded elastic matrix is preferred to own not only excellent mechanical properties, but also additional features like high toughness and fast self‐healing. Here, a polyurethane (DA‐PU) is synthesized with donor and acceptor groups alternately distributed along the main chain to achieve both intra‐chain and inter‐chain donor‐acceptor self‐assembly, which endow the polyurethane with toughness, self‐healing, and, more interestingly, thermal repair, like human muscle. In detail, DA‐PU exhibits an amazing mechanical performance with elongation at break of 1900% and toughness of 175.9 MJ m−3. Moreover, it shows remarkable anti‐fatigue and anti‐stress relaxation properties as manifested by cyclic tensile and stress relaxation tests, respectively. Even in case of large strain deformation or long‐time stretch, it can almost completely restore to original length by thermal repair at 60 °C in 60 s. The self‐healing speed of DA‐PU is gradually enhanced with the increasing temperature, and can be 1.0–6.15 µm min−1 from 60 to 80 °C. At last, a stretchable and self‐healable capacitive sensor is constructed and evaluated to prove that DA‐PU matrix can ensure the stability of electronics even after critical deformation and cut off.

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Section: Resultsmentioning

confidence: 99%

A Biologically Muscle‐Inspired Polyurethane with Super‐Tough, Thermal Reparable and Self‐Healing Capabilities for Stretchable Electronics

Ying

Wang

Kong

et al. 2021

Adv Funct Materials

127

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“…[ 2 ] Recently, self‐healing PUs have attracted considerable attention due to their recyclability and huge implications for the reduction of environmental burden. Among these, supramolecular PUs constructed from reversible non‐covalent interactions such as hydrogen bond, [ 3 ] host–guest interaction, [ 4 ] metal–ligand coordination, [ 5 ] ionic interaction, [ 6 ] π–π stacking [ 7 ] and (aromatic) disulfide bond, [ 8 ] demonstrate intrinsic self‐healability and reprocessability. In particular, the H‐bonds whose bond strengths depend on the nature of donor and acceptor are the most commonly employed to construct self‐healing PUs because of their directionality, responsiveness, and stability.…”

Section: Introductionmentioning

confidence: 99%

Multiple H‐Bonding Chain Extender‐Based Ultrastiff Thermoplastic Polyurethanes with Autonomous Self‐Healability, Solvent‐Free Adhesiveness, and AIE Fluorescence

Yao

Liu

et al. 2020

Adv Funct Materials

176

153

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Developing an autonomous room temperature self‐healing supramolecular polyurethane (PU) with toughness and stiffness remains a great challenge. Herein, a novel concept that utilizes a T‐shaped chain extender with double amide hydrogen bonds in a side chain to extend PU prepolymers to construct highly stiff and tough supramolecular PU with integrated functions is reported. Mobile side‐chain H‐bonds afford a large flexibility to modulate the stiffness of the PUs ranging from highly stiff and tough elastomer (105.87 MPa Young's modulus, 27 kJ m−2 tearing energy), to solvent‐free hot‐melt adhesive, and coating. The dynamic side‐chain multiple H‐bonds afford an autonomous self‐healability at room temperature (25 °C). Due to the rapid reconstruction of hydrogen bonds, this PU adhesive demonstrates a high adhesion strength, fast curing, reusability, long‐term adhesion, and excellent low‐temperature resistance. Intriguingly, the PU emits intrinsic blue fluorescence presumably owing to the aggregation‐induced emission of tertiary amine domains induced by side‐chain H‐bonds. The PU is explored as a counterfeit ink coated on the predesigned pattern, which is visible‐light invisible and UV‐light visible. This work represents a universal and facile approach to fabricate supertough supramolecular PU with tailorable functions by chain extension of PU prepolymers with multiple H‐bonding chain extenders.

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“…Damaged TPU showed 87% recovery after heated for 7 min at 80 °C, and completely cut TPU exhibited 80% recovery after 60 min of reattachment at the same temperature. [75]…”

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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Self-Healing Thermoplastic Polyurethane Linked via Host-Guest Interactions

Cited by 39 publications

References 66 publications

A Biologically Muscle‐Inspired Polyurethane with Super‐Tough, Thermal Reparable and Self‐Healing Capabilities for Stretchable Electronics

A Biologically Muscle‐Inspired Polyurethane with Super‐Tough, Thermal Reparable and Self‐Healing Capabilities for Stretchable Electronics

Multiple H‐Bonding Chain Extender‐Based Ultrastiff Thermoplastic Polyurethanes with Autonomous Self‐Healability, Solvent‐Free Adhesiveness, and AIE Fluorescence

A Short Review on Self‐Healing Thermoplastic Polyurethanes

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