Towards Dynamic but Supertough Healable Polymers through Biomimetic Hierarchical Hydrogen‐Bonding Interactions

Song, Yan; Liu, Yuan; Qi, Tao; Li, Guo Liang

doi:10.1002/anie.201807622

Cited by 487 publications

(414 citation statements)

References 82 publications

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“…Those results could be contributed to the critical role of the reversible nature of imine bond and UPy motif. [ 42,43 ] At the molecular level, the ‘mobile phase' existing on or near damaged area could promote intimate contact between scratched surfaces and combine the reactive groups. Meanwhile, the low T g of IU‐PAM‐2 (‐58.9 °C) and IU‐PDMS (−51.0 °C, Figure S10, Supporting Information) enabled the polymer in a high elastic state and enhanced the movement of polymer chain at room temperature, which could facilitate self‐healing.…”

Section: Resultsmentioning

confidence: 99%

Self‐Healing, Flexible, and Tailorable Triboelectric Nanogenerators for Self‐Powered Sensors based on Thermal Effect of Infrared Radiation

Dai

Huang

et al. 2020

Adv Funct Materials

127

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Self-healing triboelectric nanogenerators (TENGs) with flexibility, robustness, and conformability are highly desirable for promising flexible and wearable devices, which can serve as a durable, stable, and renewable power supply, as well as a self-powered sensor. Herein, an entirely self-healing, flexible, and tailorable TENG is designed as a wearable sensor to monitor human motion, with infrared radiation from skin to promote self-healing after being broken based on thermal effect of infrared radiation. Human skin is a natural infrared radiation emitter, providing favorable conditions for the device to function efficiently. The reversible imine bonds and quadruple hydrogen bonding (UPy) moieties are introduced into polymer networks to construct self-healable electrification layer. UPy-functionalized multiwalled carbon nanotubes are further incorporated into healable polymer to obtain conductive nanocomposite. Driven by the dynamic bonds, the designed and synthesized materials show excellent intrinsic self-healing and shape-tailorable features. Moreover, there is a robust interface bonding in the TENG devices due to the similar healable networks between electrification layer and electrode. The output electric performances of the self-healable TENG devices can almost restore their original state when the damage of the devices occurs. This work presents a novel strategy for flexible devices, contributing to future sustainable energy and wearable electronics.

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Section: Resultsmentioning

confidence: 99%

Self‐Healing, Flexible, and Tailorable Triboelectric Nanogenerators for Self‐Powered Sensors based on Thermal Effect of Infrared Radiation

Dai

Huang

et al. 2020

Adv Funct Materials

127

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“…The formation of UPy dimers leads to the effective cross‐linking and improved mechanical strength of the resultant polymers, whereas, upon stretching, the continuous unfolding and disassociation of UPy dimers enables the final polymers to exhibit high extensibility and toughness. Therefore, to date, many H‐bond cross‐linked polymers with tunable mechanical properties have been designed by chemically attaching UPy units to main chains, side chains, or chain ends …”

Section: Design Of H‐bond Cross‐linked Polymer Materialsmentioning

confidence: 99%

“…UPy units can also be chemically attached at the side chain of the resultant polymers . For example, Long and co‐workers reported the synthesis of thermoreversible poly(alkyl acrylates) via free‐radical copolymerization of UPy‐containing methacrylate monomer (SCMHB MA) and butyl acrylate.…”

Section: Design Of H‐bond Cross‐linked Polymer Materialsmentioning

confidence: 99%

High‐Performance Polymeric Materials through Hydrogen‐Bond Cross‐Linking

2019

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to traditional metallic and ceramic materials. [1] Therefore, it has been desirable to create high-performance polymeric materials that are mechanically robust, thermostable, and even healable for meeting practical applications in industry. The creation of cross-linked polymers has been regarded as one promising approach for creating strong and thermally stable polymers. [3][4][5] Cross-linked polymers normally exhibit superior mechanical and thermostable performances to their uncrosslinked counterparts. [6][7][8][9][10] Traditionally, a chemically covalent approach has been the primary means for realizing the cross-linking of polymeric materials. As compared with the parent polymer, cross-linked polymers normally gain enhanced mechanical strength and thermal stability. [6][7][8][9][10][11] This strategy, however, gives rise to significantly reduced extensibility because of the exclusive molecular mechanism between strength, extensibility, and toughness. [12][13][14][15] By contrast, noncovalent cross-linking can lead to increased mechanical strength without sacrificing the extensibility and toughness of polymeric materials. Such cross-linking can be realized by adopting strong noncovalent interactions including Coulombic interactions, [11] dipoledipole interactions, [12] metal coordination, [13] and hydrogenbonding (H-bonding) interactions. [5,16] To date, H-bonding is among the most extensively employed noncovalent interactions for the creation of cross-linked polymeric materials with tunable microstructure and tailor-made performances because of its directionality, versatility, and reversibility. In 1997, Meijer and co-workers [17] pioneered the synthesis of the first reversible cross-linked polymer by reacting a trifunctional copolymer of hydroxyl-terminated poly(propylene oxide) with diisocyanate and then 2-ureido-4-pyrimidone (UPy) units capable of forming quadruple H-bonds. The final poly mer shows a relatively high plateau modulus because such H-bond cross-links can serve as entanglements in a linear polymer. Following the synthesis of some uncross-linked polymeric materials containing UPy motifs, [17][18][19] Meijer's group has further synthesized many cross-linked polymeric materials based on UPy motifs. [20][21][22] On the other hand, in many natural biological materials, such as silk [23][24][25][26] and muscle, [27] multiple H-bonding interactions have recently been revealed to play a critical part in realizing a unique combination of high strength, great It has always been critical to develop high-performance polymeric materials with exceptional mechanical strength and toughness, thermal stability, and even healable properties for meeting performance requirements in industry. Conventional chemical cross-linking leads to enhanced mechanical strength and thermostability at the expense of extensibility due to mutually exclusive mechanisms. Such major challenges have recently been addressed by using noncovalent cross-linking of reversible multiple hydrogen-bonds (H-bonds) that widely exist in biological...

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“…High mechanical strength usually leads to low dynamics and as a consequence inhibits the self‐healing capability of materials, which represents a wide trade‐off in the design of self‐healable materials . Taking advantage of the interplay of four types of dynamic combinations (i.e.…”

Section: Figurementioning

confidence: 99%

Toughening a Self‐Healable Supramolecular Polymer by Ionic Cluster‐Enhanced Iron‐Carboxylate Complexes

et al. 2020

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Supramolecular polymers that can heal themselves automatically usually exhibit weakness in mechanical toughness and stretchability. Here we exploit a toughening strategy for a dynamic dry supramolecular network by introducing ionic cluster‐enhanced iron‐carboxylate complexes. The resulting dry supramolecular network simultaneous exhibits tough mechanical strength, high stretchability, self‐healing ability, and processability at room temperature. The excellent performance of these distinct supramolecular polymers is attributed to the hierarchical existence of four types of dynamic combinations in the high‐density dry network, including dynamic covalent disulfide bonds, noncovalent H‐bonds, iron‐carboxylate complexes and ionic clustering interactions. The extremely facile preparation method of this self‐healing polymer offers prospects for high‐performance low‐cost material among others for coatings and wearable devices.

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Towards Dynamic but Supertough Healable Polymers through Biomimetic Hierarchical Hydrogen‐Bonding Interactions

Cited by 487 publications

References 82 publications

Self‐Healing, Flexible, and Tailorable Triboelectric Nanogenerators for Self‐Powered Sensors based on Thermal Effect of Infrared Radiation

Self‐Healing, Flexible, and Tailorable Triboelectric Nanogenerators for Self‐Powered Sensors based on Thermal Effect of Infrared Radiation

High‐Performance Polymeric Materials through Hydrogen‐Bond Cross‐Linking

Toughening a Self‐Healable Supramolecular Polymer by Ionic Cluster‐Enhanced Iron‐Carboxylate Complexes

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