Recyclability and Self‐Healing of Dynamic Cross‐Linked Polyimide with Mechanical/Electrical Damage

Wan, Baoquan; Zheng, Ming‐Sheng; Yang, Xing; Dong, Xiaodi; Li, Yuchao; Mai, Yiu‐Wing; Zha, Jun‐Wei

doi:10.1002/eem2.12427

Cited by 34 publications

(18 citation statements)

References 39 publications

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“…12,13 Extrinsic polymers utilize external implementations to realize self-healing, such as microcapsules, [14][15][16][17][18] microvascular networks [19][20][21][22][23] and thermoplastics. [24][25][26] While, the intrinsic polymers themselves poses the ability to heal based on reversible chemical bonds or intermolecular interactions, 27 such as transesterification, [28][29][30][31][32] Diels-Alder (D-A) reaction, [33][34][35][36][37][38][39] disulfide exchange, [40][41][42] imide exchange, [43][44][45] hydrogen bonding, [46][47][48][49][50] etc. Owing to the excellent capability of selfhealing polymers in extending the service life of materials, the relevant research has been flourishing in recent years.…”

Section: Overviewmentioning

confidence: 99%

Intrinsic and extrinsic self‐healing fiber‐reinforced polymer composites: A review

Wang,

Tang,

Chen

et al. 2023

Polymer Composites

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With their high specific modulus, high specific strength and designability, fiber‐reinforced polymer (FRP) composites have replaced or surpassed traditional metallic materials in a wide range of applications. However, the polymer matrix of commonly used FRP composites is usually a thermosetting polymer that is difficult to rework once formed, which implants a substantial challenge for the repair and recycling of composites. Self‐repair, as an emerging method of repairing polymer‐based materials, has the advantages of simplification, high efficiency and repeatability against traditional repair methods. Research on self‐healing polymer materials is developing rapidly and becoming more systematic. With the development of self‐healing polymer, polymer‐based composites with self‐healing capabilities are becoming possible. This paper reviews the current development of self‐healing polymers in recent years, with specific emphasis on their applications in FRP composites. According to the difference in healing mechanisms, the self‐healing polymer composites are split into two categories, intrinsic and extrinsic ones. The essential concepts and different types of intrinsic and extrinsic self‐healing composites are first introduced. Then, their pros and cons are discussed, respectively. Finally, the perspectives of intrinsic as well as extrinsic self‐healing FRP composites are put forward.Highlights Development of self‐healing fiber‐reinforced polymer composites. Extrinsic and intrinsic self‐healing fiber‐reinforced polymer composites. Pros and cons of self‐healing fiber‐reinforced polymer composites. Perspectives of self‐healing fiber‐reinforced polymer composites.

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Section: Overviewmentioning

confidence: 99%

Intrinsic and extrinsic self‐healing fiber‐reinforced polymer composites: A review

Wang,

Tang,

Chen

et al. 2023

Polymer Composites

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“…The Weibull parameters, β (Weibull modulus), and E 0 (characteristic breakdown strength at P = 63.2%) are also provided by the reference. [16,27] Obviously, the breakdown strength of the HTPI films increases with increasing crosslinking degree due to changes in treatment temperature. Surprisingly, HTPI/200 °C has the highest breakdown strength E 0 of ≈487 kV mm −1 compared with HTPI/260 °C and TOBPI (Figure S3f, Supporting Information), which may be attributed to the perfect combination of HDCN and PHT structure.…”

Section: Conceptual Design and Structures Of Atpo And Htpi Filmsmentioning

confidence: 99%

“…[39] However, the breakdown strength of the second recycled film has seriously decreased, which may be attributed to the repeated effects of HCl to make the film brittle (Figure 5g). [16] Then the recycled insulating properties of electrical (electric breakdown and corona) damaged HTPI/260 °C film are studied in detail. As described in Figure 5h, the film seriously damaged by electric breakdown (Figure 5h-I) is subjected to HCl dissociation and heated treatment to polymerize into a complete film with a smooth surface (Figure 5h-II).…”

Section: Self-healable Ability and Recyclability Of Htpi Filmsmentioning

confidence: 99%

“…For example, the dynamic covalent bond of Schiff base is introduced into PI to realize the recycling of PI by the dynamic reversible. [16] Although the PI prepared by this method does not excessively reduce the T g and insulation properties, the means of self-healing and degradation are relatively harsh in production. Therefore, the key to solving the problem is to develop a kind of PI with a simple self-healing method and excellent degradability.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Sustainable Polyimide Film Combining Hardness with Softness via a “Mimosa‐Like” Bionic Strategy

et al. 2022

Self Cite

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Dielectric polyimides (PIs) are ubiquitous as insulation in electrical power systems and electronic devices. Generally, dynamic polyimide is required to solve irreversible failure processes of electrical or mechanical damage, for example, under high temperature, pressure, and field strength. The challenge lies in the design of the molecular structure of rigid polyimide to achieve dynamic reversibility. Herein, a low‐molecular‐weight polyimide gene unit is designed to crosslink with polyimide ligase to prepare the smart film. Interestingly, due to the variability of gene unit and ligase combinations, the polyimide films combining hardness with softness are designed into three forms via a “Mimosa‐like” bionic strategy to adapt to different application scenarios. Meanwhile, the films have good degradation efficiency, excellent recyclability, and can be self‐healable, which makes them reuse. Clearly, the films can be used in the preparation of ultrafast sensors with a response time ≈0.15 s and the application of corona‐resistant films with 100% recovery. Furthermore, the construction of polyimide and carbon‐fiber‐reinforced composites (CFRCs) has been verified to apply to the worse environment. Nicely, the composites have the property of multiple cycles and the non‐destructive recycle rate of carbon fiber (CF) is as high as 100%. The design idea of preparing high‐strength dynamic polyimide by crosslinking simple polyimide gene unit with ligase could provide a good foundation and a clear case for the sustainable development of electrical and electronic polyimides, from the perspective of Mimosa bionics.

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“…Imine exchange reactions have been extensively used to construct chemically recyclable polyimine (PI)-based supramolecular thermosets. ,,,− These PI materials are widely used to fabricate electronic skins, − thin electrolyte membranes for solid-state lithium batteries, and fully recyclable carbon fiber-reinforced composites. − However, most of these PI materials lack enough mechanical strength, hindering their prospects of replacing traditional thermosetting plastics. ,− , An effective strategy to prepare high-performance PI thermosets is to introduce diverse cross-linking structures, such as metal coordination or aromatic structures, , into the polymer networks. For example, by integrating a metal complex into PI networks, mechanically robust PI thermosets with good creep resistance and thermal stability were developed .…”

Section: Introductionmentioning

confidence: 99%

Chemically Recyclable Supramolecular Thermosets toward Strong and Reusable Hot-Melt Adhesives

Bao,

Yin,

Ding

et al. 2023

Macromolecules

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Chemically recyclable thermosets are an ideal substitute for traditional thermosets in the development of a circular economy and sustainable environment. However, the development of efficient and easy-to-achieve chemical recycling strategies remains challenging. Herein, a series of supramolecular thermosets that can be chemically recycled under mild acid conditions at room temperature are fabricated by cross-linking the polyimine polymers with dynamic boroxines (PI x -Boroxine). By tailoring the molar content of boroxines, the PI 1.2 -boroxine can exhibit a tensile strength of ∼30.6 MPa, a tensile yield strength of 33.0 MPa, an elongation at break of ∼111.6%, and a Young's modulus of ∼679.6 MPa. Because of the dynamic nature of boroxines and imine bonds, the PI x -boroxine supramolecular thermoset exhibits fast stress relaxation behavior, which enables them to have good reprocessing ability. These unique features can also guarantee the PI x -boroxine supramolecular thermosets to be a highperformance reusable hot-melt adhesive. The maximum lap shear strength of the PI x -Boroxine-based hot-melt adhesives in stainless steel bonding adhesive can reach ∼18.6 MPa, which is comparable to that of commercial hot-melt adhesives. Meanwhile, the PI x -Boroxine-based hot-melt adhesives can be reused at least 10 times with only a small amount of reduction in lap shear strength. More importantly, the PI x -boroxine supramolecular thermosets can be easily depolymerized in a 0.1 M HCl/H 2 O solution at room temperature. Further, the monomers can be easily and efficiently separated by a simple separation procedure. The recovered monomers can also be reused to fabricate new PI x -boroxine supramolecular thermosets without losing their mechanical properties. This work provides a new design strategy to develop high-performance thermosets with easy-to-achieve chemical recyclability, which will contribute to the sustainable development of modern society.

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Recyclability and Self‐Healing of Dynamic Cross‐Linked Polyimide with Mechanical/Electrical Damage

Cited by 34 publications

References 39 publications

Intrinsic and extrinsic self‐healing fiber‐reinforced polymer composites: A review

Intrinsic and extrinsic self‐healing fiber‐reinforced polymer composites: A review

Dynamic Sustainable Polyimide Film Combining Hardness with Softness via a “Mimosa‐Like” Bionic Strategy

Chemically Recyclable Supramolecular Thermosets toward Strong and Reusable Hot-Melt Adhesives

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