Developing visible-light-induced dynamic aromatic Schiff base bonds for room-temperature self-healable and reprocessable waterborne polyurethanes with high mechanical properties

Fan, Wuhou; Jin, Yong; Shi, Liangjie; Zhou, Rong; Du, Wei

doi:10.1039/c9ta13928a

Cited by 84 publications

(34 citation statements)

References 74 publications

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“…The comparisons of the self-healing time and tensile stress between WPU-PA-1.5 film and the reported self-healing polymer materials were exhibited in Figure 7f. 15,18,19,[42][43][44][45][46][47][48] It can be seen from the figure that although tensile stress of our sample is not the highest, the self-healing time was shorter than polymer materials with higher tensile stress. Generally, our sample displays the balance of higher tensile stress and shorter self-healing time, which provided a reference for self-healing materials.…”

Section: Self-healing Behaviors Of Wpu-pa-x Filmsmentioning

confidence: 99%

Synthesis and self‐healing investigation of waterborne polyurethane based on reversible covalent bond

Ren

Dong

Duan

et al. 2022

J of Applied Polymer Sci

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A series of self-healing waterborne polyurethane (WPU) films utilizing reversible covalent bond acylhydrazones diol (PA) as chain extender were successfully synthesized. The self-healing performance of WPU with different content of chain extender PA has been systemically characterized via cut-and-healing tests and mechanical quantitative evaluation. The film can repair cracks through acylhydrazone exchange reactions within 12 h. When the content of PA is 1.5 wt%, the WPU has the highest self-healing efficiency of 90.5%. Meanwhile, the effect of PA mass fraction on the particle size distribution, mechanical ability, crystallization, water resistance properties, and thermal stability of WPU were evaluated. With the introduction of acylhydrazone bonds, the hydrophobicity of the WPU material was enhanced, while achieving self-healing performance, which solves the problem of aging and replacement of materials. These results indicated that the self-healing WPU exhibited great application prospect as a versatile material.acylhydrazones, reversible covalent bond, self-healing, waterborne polyurethane | INTRODUCTIONPolyurethane (PU) is extensively applicable polymer materials, and it has been broadly used in various fields such as adhesives, foam materials, elastomers biomaterials, and so forth due to its excellent mechanical property, desirable molecular adaptability and good processing ability. However, the development of traditional PU products has been limited because of the utilization of organic solvents. Waterborne polyurethane (WPU) materials possess the excellent properties as those of traditional PU products have, such as outstanding mechanical property, excellent flexibility and multi-adaptability. Meanwhile, WPU materials are low toxicity and reduced

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Section: Self-healing Behaviors Of Wpu-pa-x Filmsmentioning

confidence: 99%

Synthesis and self‐healing investigation of waterborne polyurethane based on reversible covalent bond

Ren

Dong

Duan

et al. 2022

J of Applied Polymer Sci

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“…The formed waterborne PU nanomaterials exhibited desirable self‐healability with 84% healing efficiency after healing under a commercial LED table lamp for 24 h at 25 °C. [ 105 ] Dynamic imine metathesis could be enhanced with the aid of water. Zhang and coworkers reported the fabrication of water‐enabled room‐temperature self‐healable and recyclable polyurea crosslinked network materials.…”

Section: Incororation Of Dynamic Covalent Chemistriesmentioning

confidence: 99%

Dynamic Covalent Polyurethane Network Materials: Synthesis and Self‐Healability

Nellepalli

Patel

2021

Macromol. Rapid Commun.

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Polyurethane (PU) has not only been widely used in the daily lives, but also extensively explored as an important class of the essential polymers for various applications. In recent years, significant efforts have been made on the development of self‐healable PU materials that possess high performance, extended lifetime, great reliability, and recyclability. A promising approach is the incorporation of covalent dynamic bonds into the design of PU covalently crosslinked polymers and thermoplastic elastomers that can dissociate and reform indefinitely in response to external stimuli or autonomously. This review summarizes various strategies to synthesize self‐healable, reprocessable, and recyclable PU materials integrated with dynamic (reversible) Diels–Alder cycloadduct, disulfide, diselenide, imine, boronic ester, and hindered urea bond. Furthermore, various approaches utilizing the combination of dynamic covalent chemistries with nanofiller surface chemistries are described for the fabrication of dynamic heterogeneous PU composites.

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“…[1][2][3][4][5][6] Both reversible supramolecular interactions and dynamic covalent bonds [6][7][8][9][10][11] have been utilized to design these novel materials. Via the exchange of non-covalent or covalent bonds, their temporary 3D cross-linked network topology can be rearranged under external triggers like heat, [12,13] moisture, [14,15] pH, [16][17][18][19] light, [20][21][22][23] and solvent, [24][25][26][27][28] thus endowing these materials with excellent self-healing and reprocessable capacities.…”

Section: Introductionmentioning

confidence: 99%

Mechanically Strong, Autonomous Self‐Healing, and Fully Recyclable Silicone Coordination Elastomers with Unique Photoluminescent Properties

Zhao

Wang

Xie³

et al. 2021

Macromol. Rapid Commun.

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The combination of excellent mechanical performances, high reprocess efficiency, and wide-range tunability for functional dynamic siloxane materials is a challenging subject. Herein, the fabrication of mechanically strong, autonomous self-healing, and fully recyclable silicone elastomers with unique photoluminescent properties by coordination of poly(dimethylsiloxane) (PDMS) containing coordination bonding motifs with Zn 2+ ions is reported. Salicylaldimine groups, which are introduced into the polysiloxane backbone via mild Schiff-base reaction, coordinate with zinc ions to form elastomeric networks The obtained supramolecular elastomers have excellent mechanical properties, with the optimized tensile strength up to 10.0 MPa, which is unprecedented among the reported thermoplastic polysiloxane-based elastomers. Both mechanical properties and stress relaxation kinetics are tunable via adjusting the length of PDMS segments or the molar ratio of metal versus salicylaldimine. Furthermore, these elastomers can be conveniently healed and recycled to regain their original mechanical properties and integrity under mild conditions. In addition, this new kind of polysiloxane also exhibits coordination-enhanced fluorescence, showing great promise for preparing photoluminescent elastomers or coatings.

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Developing visible-light-induced dynamic aromatic Schiff base bonds for room-temperature self-healable and reprocessable waterborne polyurethanes with high mechanical properties

Abstract: Visible-light-induced dynamic aromatic Schiff base bond was developed for waterborne polyurethanes, which possess a desirable room-temperature self-healability and excellent mechanical properties (tensile stress: 14.32 MPa; toughness: 64.80 MJ m−3).

Cited by 84 publications

References 74 publications

Synthesis and self‐healing investigation of waterborne polyurethane based on reversible covalent bond

Synthesis and self‐healing investigation of waterborne polyurethane based on reversible covalent bond

Dynamic Covalent Polyurethane Network Materials: Synthesis and Self‐Healability

Mechanically Strong, Autonomous Self‐Healing, and Fully Recyclable Silicone Coordination Elastomers with Unique Photoluminescent Properties

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