Cross-linking induced thermo-responsive self-healing hydrogel with gel-sol–gel transition constructed on dynamic covalent bond

Shen, Jiafu; Chang, Limin; Chen, Danyang; Wang, Yong; Li, Wenjuan; He, Yingna; Qin, Jianglei

doi:10.1007/s10965-021-02492-3

Cited by 12 publications

(12 citation statements)

References 41 publications

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“…[20][21][22][23] The phase-change enthalpy, temperature, and rate are important parameters that affect the endothermic effect. 24 Polymers that undergo a sol-gel transition involve a similar thermal switch, in which the polymer undergoes a sol-gel transition when the ambient temperature reaches the sol-gel transition temperature; 8,[25][26][27] however, they have an additional advantage that is the sol-gel transition hinders or even eliminates ion transport inside the ESDs, thus switching off the current flow and preventing further heat accumulation caused by continued work under overheating conditions. 8,28,29 Thermal melting polymers operate by releasing a functional substance such as a flame retardant or electrolyte poisons when the temperature of the ESDs reaches the melting point of the polymer, thereby preventing thermal runaway.…”

Section: Introductionmentioning

confidence: 99%

Thermally responsive polymers for overcoming thermal runaway in high-safety electrochemical storage devices

Chen

Liu

Feng

et al. 2023

Mater. Chem. Front.

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Section: Introductionmentioning

confidence: 99%

Thermally responsive polymers for overcoming thermal runaway in high-safety electrochemical storage devices

Chen

Liu

Feng

et al. 2023

Mater. Chem. Front.

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“…The introduction of DCBs regenerates covalent bonds inside and at the interface of polymeric materials via transesterification [ 12 ], olefin metathesis [ 13 , 14 ], reversible boronate ester formation [ 15 , 16 ], and dichalcogenide bond exchange [ 17 , 18 ]. Furthermore, studies on CLPs containing DCBs have revealed that they exhibit properties such as self-healing [ 19 , 20 ], shape memory [ 21 ], and the ability to undergo reversible sol-gel reactions [ 22 ]. Self-healing based on bond exchange reactions prevents catastrophic structural collapse and extends the lifetime of materials.…”

Section: Introductionmentioning

confidence: 99%

Self- and Cross-Fusing of Furan-Based Polyurea Gels Dynamically Cross-Linked with Maleimides

2023

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Bio-based polyureas (PUs) with main-chain furan rings were synthesized by the polyaddition of 2,5-bis(aminomethyl)furan with various diisocyanates, such as methylene diphenyl diisocyanate. Several PU’s were soluble in polar organic solvents, and were cast to form thermomechanically stable films with softening temperatures of over 100 °C. The furan rings of the PU main chains underwent a dynamic Diels-Alder (DA) reaction with bismaleimide (BMI) cross-linkers. While the mixed solution of PU and BMI did not show any apparent signs of reaction at room temperature, the DA reaction proceeded to form gels upon heating to 60 °C, which became a solution again by further heating to 80 °C (retro-DA reaction). The solution phase was maintained by rapid quenching from 80 °C to room temperature, while the gel was reformed upon slow cooling. The recovered gels exhibited self-healing properties. A scratch made by a hot knife at temperatures above 80 °C disappeared spontaneously. When two different gels were cut using a knife at room temperature, placed in contact with each other, and heated to 60 °C, they fused. The ability to control the DA/retro-DA reaction allowed gels of varying composition to heal.

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“…Nowadays, we have constructed a hydrogel using acylhydrazone bonds and find that the prepared hydrogel can be self‐healed without external stimuli. Most of the acylhydrazone‐based hydrogels reported in the past had poor mechanical properties and toughness 22–24 . It was desirable to prepare acylhydrazone hydrogels with excellent mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…Most of the acylhydrazonebased hydrogels reported in the past had poor mechanical properties and toughness. [22][23][24] It was desirable to prepare acylhydrazone hydrogels with excellent mechanical properties.…”

mentioning

confidence: 99%

Double dynamic bonds tough hydrogel with high self‐healing properties based on acylhydrazone bonds and borate bonds

Chen

Wang

Guo

et al. 2022

Polymers for Advanced Techs

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Hydrogels with excellent self-healing properties have specific applications in smart polymer materials, but they often do not have excellent mechanical properties, or the preparation process of hydrogels is too complicated. Here, we prepared a multi-functional intelligent hydrogel using a simple water bath one-pot method through the synergistic effect of dual dynamic cross-linked agents, including acylhydrazone bonds (the first cross-linked agent) and borate ester bonds (the second cross-linked agent), at the same time hydrogen bonds provided physical interaction. The hydrogel exhibited excellent self-healing ability (up to 91%) and extraordinary mechanical strength (tensile stress 173.1405 kPa and hysteresis energy of 1.8659 MJ m À3 ). The research used chemical cross-linked (acylhydrazone bonds and borate ester bonds) and physical cross-linked (hydrogen bonds). The prepared hydrogel had the dual advantages of excellent self-healing performance and high mechanical strength. The hydrogel can be used in smart materials, such as working pressure tissues and sensing materials that require a certain degree of mechanical strength and self-healing properties, and also provides a design strategy for preparing hydrogels with high mechanical strength and excellent self-healing properties.

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Cross-linking induced thermo-responsive self-healing hydrogel with gel-sol–gel transition constructed on dynamic covalent bond

Cited by 12 publications

References 41 publications

Thermally responsive polymers for overcoming thermal runaway in high-safety electrochemical storage devices

Thermally responsive polymers for overcoming thermal runaway in high-safety electrochemical storage devices

Self- and Cross-Fusing of Furan-Based Polyurea Gels Dynamically Cross-Linked with Maleimides

Double dynamic bonds tough hydrogel with high self‐healing properties based on acylhydrazone bonds and borate bonds

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