Photo-induced topological self-reorganization and self-growth of polymer based on dynamic reversible aromatic pinacol units

Li, Yuan; Zhang, Ze Ping; Mo, Wei; Rong, Min Zhi; Zhang, Ming Qiu; Liu, Dong

doi:10.1016/j.polymer.2020.122299

Cited by 10 publications

(12 citation statements)

References 51 publications

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“…It is worth noting that networks of reversible cross-linked polymers can be rearranged when the included reversible bonds are triggered by external stimuli and fixed again in the absence of the stimuli. − Based on this principle, a series of novel processing techniques that used to be hard to realize for cross-linked polymers have been developed, such as structure–property regulation, − intrinsic self-healing, − plastic deformation, − solid-state recycling, − and controllable degradation. − Inspired by these successes, we have developed a kind of molecular-level interlocking polymer networks (RILNs) by the topological reorganization of two immiscible reversible cross-linked networks, which show not only self-healing and reprocessing ability but also nonlinear improvement of mechanical performance. , It is anticipated that the concept of RILNs could also be valid for designing high-performance underwater self-healing materials by bringing the synergy between the macromolecules of different networks into full play.…”

Section: Introductionmentioning

confidence: 99%

Reversibly Interlocked Macromolecule Networks with Enhanced Mechanical Properties and Wide pH Range of Underwater Self-Healability

Peng

Zhang

Rong

et al. 2020

ACS Appl. Mater. Interfaces

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A novel strategy for developing homogeneous reversibly interlocking polymer networks (RILNs) with enhanced mechanical properties and underwater self-healing ability is proposed. The RILNs are prepared by the topological reorganization of two preformed cross-linked polymers containing reversible catechol−Fe 3+ coordinate bonds and imine bonds and exhibit enhanced mechanical properties, superior underwater self-healing effect within a wide pH range, and water-assisted recycling ability through synergetic action between the reversible catechol−Fe 3+ and imine bonds. At higher pH values, the catechol−Fe 3+ coordinate bonds are responsible for self-healing, while the imine bonds maintain the stability of the materials. In neutral water, the imine bonds mainly account for self-healing, and hydrogen bonds and entanglements between the two networks prevent the material from collapsing. Under a lower pH value, intermolecular hydrogen bonds and entanglements contribute to self-healing. The outcomes of this work provide a new idea for developing robust multifunctional underwater self-healing materials.

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Section: Introductionmentioning

confidence: 99%

Reversibly Interlocked Macromolecule Networks with Enhanced Mechanical Properties and Wide pH Range of Underwater Self-Healability

Peng

Zhang

Rong

et al. 2020

ACS Appl. Mater. Interfaces

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“…The UV intensity required for implementation of the healing (≤3.5 mW cm −2 ) is much lower than those applied in the previous works (6.5−2000 mW cm −2 ). [ 14,18,21,23,24,34,35 ]…”

Section: Resultsmentioning

confidence: 99%

“…

recombination equilibrium [33][34][35] have been utilized to endow polymeric materials with photo-reversible self-healing capability. However, the reported excitations mainly came from artificial UV and visible lights.

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confidence: 99%

Sunlight Stimulated Photochemical Self‐Healing Polymers Capable of Re‐Bonding Damages up to a Centimeter Below the Surface Even Out of the Reach of the Illumination

Zhang

Rong

et al. 2023

Advanced Materials

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The development of photochemical self‐healing polymers faces the the following bottlenecks: i) only the surface cracks can be restored and ii) materials’ mechanical properties are lower. To break these bottlenecks, cross‐linked poly(urethane‐dithiocarbamate)s carrying photo‐reversible dithiocarbamate bonds covalently linked to indole chromophores and benzyl groups are designed. The conjugated structure of the chromophore and benzyl enhances the addition reactivity of thiocarbonyl moiety and facilitates photo‐cleavage of CS bond, so that transfer of the created radicals among dithiocarbamate linkages is promoted. Accordingly, reshuffling of the reversibly cross‐linked networks via dynamic exchange between the activated dithiocarbamates is enabled in both surface layer and the interior upon exposure to the low‐intensity ultraviolet (UV) light from the sun. It is found that the damages up to a centimeter below the surface can be effectively recovered in the sunshine, which greatly exceeds the maximum penetration distance of UV light (hundreds of microns). Besides, tensile strength and failure strain of the poly(urethane‐dithiocarbamate) are superior to the reported photo‐reversible polymers, achieving the record‐high 33.8 MPa and 782.0% owing to the wide selectivity of soft/hard blocks, multiple interactions, and appropriate cross‐linking architecture. The present work provides a novel paradigm of photo self‐healing polymers capable of re‐bonding cracks even out of the reach of the illumination.

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“…The preparation of a pinacol 86 derived from 4-(2-hydroxyethoxy)benzophenone (32%) under UV irradiation was performed with the aim to prepare a novel photo-reversible unit for preparing dynamic covalent polymers, which can be cleaved and rebonded under UV irradiation (Table 1, entry 3). 72 The absence of a photocatalyst and the presence of isopropanol, together with a catalytic amount of acetic acid, justified the mechanism Type B (Scheme 30) based on a SET coupled with hydrogen atom transfer (HAT). This analogous mechanism was proposed in the metal-free pinacol coupling performed with hydrazine, which acted as a reductant instead of isopropanol in Scheme 30.…”

Section: Review Synthesismentioning

confidence: 99%

Photocatalytic Homocoupling Transformations

et al. 2021

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The homocoupling reactions promoted by photocatalysts are not very abundant in the literature but compounds generated from them are very interesting. In this short review the coverage of this item will be classified as follows on the basis of the starting material nature. 1. Introduction 2. Arenes and heteroarenes 3. Alkenes 4. Alkanes 5. Alkynes 6. Aldehydes, ketones, alcohols, amines and imines 7. Carboxylic acids 8. Nitrocompounds 9. Conclusions

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Photo-induced topological self-reorganization and self-growth of polymer based on dynamic reversible aromatic pinacol units

Cited by 10 publications

References 51 publications

Reversibly Interlocked Macromolecule Networks with Enhanced Mechanical Properties and Wide pH Range of Underwater Self-Healability

Reversibly Interlocked Macromolecule Networks with Enhanced Mechanical Properties and Wide pH Range of Underwater Self-Healability

Sunlight Stimulated Photochemical Self‐Healing Polymers Capable of Re‐Bonding Damages up to a Centimeter Below the Surface Even Out of the Reach of the Illumination

Photocatalytic Homocoupling Transformations

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