High-Performance Cross-Linked Self-Healing Material Based on Multiple Dynamic Bonds

Xu, Min; Cheng, Bo; Sheng, Yeming; Zhou, Jinqiu; Minhui, Wang; Jia, Xiaolin; Lu, Xun

doi:10.1021/acsapm.0c00154

Cited by 49 publications

(38 citation statements)

References 60 publications

(73 reference statements)

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“…By tailoring the amount 'disulfide to polysulfide ratio', full recovery of mechanical performance and healing capability were achieved. Similarly, Xu et.al [196] 2020, designed a polyurethane elastomer with triple synergy dynamic bonds based on boric acid and SÀ S cross-links to overcome the tradeoff between mechanical and self-healing performance. Here, the boronic ester bonds under alkaline conditions were found to be highly beneficial in improving the mechanical properties (tensile stress and elongation at break of 27.3 MPa and 1177%), while the SÀ S bonds served as reversible cross-links and were responsible for a self-healing efficiency of 99% after treatment at 60°C for 24 h. Further, the synergistic combination of SÀ S bonds and reversible boronic ester bonds enhanced the segmental mobility resulting in lowering T g and transition activation energy.…”

Section: Disulfide Bondsmentioning

confidence: 99%

Design Principles of Interfacial Dynamic Bonds in Self‐Healing Materials: What are the Parameters?

Sattar

Patnaik

2020

Chemistry An Asian Journal

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Polymers and polymer nanocomposites (PNCs) are extensively used in daily life. However, the growing requirement of advanced PNCs laid persistent environmental issues due to deformation‐induced damage that once formed, does not vanish at future stages. Therefore, self‐healing materials with significantly enhanced long life and safety have been designed to epitomize the forefront of recent advances in materials chemistry and engineering. Self‐healing PNC (SH‐PNCs) materials are a class of smart composites in which nanoparticles induce interfacial reconstruction via multiple covalent and non‐covalent interactions culminating in improved mechanical strength and self‐healing capability. However, since the filler nanoparticles are independent of the reversible supramolecular network, the filler incorporation destroys the self‐healing ability but could enhance the mechanical strength. Hence, the molecular parameters controlling the alliance of robust mechanical strength with virtuous self‐healing ability is a crucial challenge. Herein, we review the latest developments that have been made in self‐healing materials and puts advancing insights into the fabrication of SH‐PNCs in which the combination of covalent bonds and non‐covalent interactions provides an optimal balance between their mechanical performance and self‐healing capability. We highlight the importance of specific entropic, enthalpic changes, polymer chain conformations and flexibility that enable the reconstruction of damaged surface and physical reshuffling of dynamic bonds at the interface of cut surfaces.

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Section: Disulfide Bondsmentioning

confidence: 99%

Design Principles of Interfacial Dynamic Bonds in Self‐Healing Materials: What are the Parameters?

Sattar

Patnaik

2020

Chemistry An Asian Journal

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“…In a recent study, Xu et al [ 111 ] designed a PUR with three complementary dynamic bonds. In addition to the intrinsic hydrogen bonding ability of the urethane groups, the polymer backbone is equipped with thermo-responsive disulfide bonds, and the system was further chemically crosslinked with boronic esters.…”

Section: Polyurethane Elastomersmentioning

confidence: 99%

Dually Crosslinked Polymer Networks Incorporating Dynamic Covalent Bonds

2021

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Covalent adaptable networks (CANs) are polymeric networks containing covalent crosslinks that are dynamic under specific conditions. In addition to possessing the malleability of thermoplastics and the dimensional stability of thermosets, CANs exhibit a unique combination of physical properties, including adaptability, self-healing, shape-memory, stimuli-responsiveness, and enhanced recyclability. The physical properties and the service conditions (such as temperature, pH, and humidity) of CANs are defined by the nature of their constituent dynamic covalent bonds (DCBs). In response to the increasing demand for more sophisticated and adaptable materials, the scientific community has identified dual dynamic networks (DDNs) as a promising new class of polymeric materials. By combining two (or more) distinct crosslinkers in one system, a material with tailored thermal, rheological, and mechanical properties can be designed. One remarkable ability of DDNs is their capacity to combine dimensional stability, bond dynamicity, and multi-responsiveness. This review aims to give an overview of the advances in the emerging field of DDNs with a special emphasis on their design, structure-property relationships, and applications. This review illustrates how DDNs offer many prospects that single (dynamic) networks cannot provide and highlights the challenges associated with their synthesis and characterization.

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“…Second, disulfide bond itself is one of important dynamic covalent bonds, metathesis reaction of which would endow the materials with self‐healing or reprocessing properties. [ 44–47 ] As a result, the application of the materials can be significantly broadened. In addition, the crosslinked PTUs can be applied as specific optical materials since the materials have quite high refractive indices due to their high contents of sulfur element.…”

Section: Introductionmentioning

confidence: 99%

Polythiourethanes Crosslinked with Dynamic Disulfide Bonds: Synthesis via Nonisocyanate Approach, Thermomechanical and Reprocessing Properties

Zhao

Liu

et al. 2021

Macromol. Rapid Commun.

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Polythiourethanes (PTUs) crosslinked with dynamic disulfide bonds are synthesized via a nonisocyanate approach. First, a difunctional five‐membered cyclic trithiocarbonate (1) is synthesized via the reaction of diglycidyl ether of bisphenol A (DGEBA) with carbon disulfide (CS2). Thereafter, the step‐growth polymerizations of 1 with α,ω‐diamino poly(propylene oxide)s with various molar masses are carried out to obtain a series of linear poly(mercapto thiourethane)s. These linear poly(mercapto thiourethane)s are readily crosslinked upon formation of disulfide bonds, which are generated via radical coupling reaction with the side mercapto groups. These crosslinked PTUs can be tailored into the materials from thermosetting plastics to crosslinked elastomers, depending on the molar masses of α,ω‐diamino poly(propylene oxide)s. More importantly, these crosslinked PTUs display excellent reprocessing properties at elevated temperatures, which is attributable to the metathesis reaction of dynamic disulfide bonds.

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High-Performance Cross-Linked Self-Healing Material Based on Multiple Dynamic Bonds

Cited by 49 publications

References 60 publications

Design Principles of Interfacial Dynamic Bonds in Self‐Healing Materials: What are the Parameters?

Design Principles of Interfacial Dynamic Bonds in Self‐Healing Materials: What are the Parameters?

Dually Crosslinked Polymer Networks Incorporating Dynamic Covalent Bonds

Polythiourethanes Crosslinked with Dynamic Disulfide Bonds: Synthesis via Nonisocyanate Approach, Thermomechanical and Reprocessing Properties

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