Ultra stretchable, tough and self-healable poly(acrylic acid) hydrogels cross-linked by self-enhanced high-density hydrogen bonds

Zhang, Rui; Fu, Qionglong; Zhou, Keming; Yao, Yuan; Zhu, Xuedong

doi:10.1016/j.polymer.2020.122603

Cited by 27 publications

(13 citation statements)

References 50 publications

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“…In fact, to ensure the durability and reliability of hydrogels, substantial effort and progress have been devoted to the intrinsic self‐healable hydrogels. One of the most widely used approaches for endowing hydrogels with intrinsic self‐healability is the exploitation of supramolecular chemistries on the basis of the reversible non‐covalent interactions, [ 8,14–19 ] such as hydrogen‐bonding, electrostatic or ionic interactions, metal coordination, hydrophobic associations, host‐guest interactions, and π–π stacking. In addition to the noncovalent self‐healing mechanisms, the recent advances in dynamic covalent chemistry have also offered an alternative strategy to the construction of self‐healable hydrogels.…”

Section: Introductionmentioning

confidence: 99%

“…Despite the great progress achieved previously, one of the long‐standing challenges in the field of intrinsic self‐healing hydrogels is to resolve the tradeoff between the mechanical property and self‐healing capacity. [ 7,10,13,16 ] Apparently, the unstable and highly reversible noncovalent or dynamic covalent bonds behind self‐healable systems conflict with the high mechanical performances that typically company with stable and strong intermolecular bonds. In addition, the mobility and dynamics of polymer chains within the hydrogel matrix play a key role in ensuring self‐healing.…”

Section: Introductionmentioning

confidence: 99%

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A Facile Strategy for Synergistic Integration of Dynamic Covalent Bonds and Hydrogen Bonds to Surmount the Tradeoff between Mechanical Property and Self‐Healing Capacity of Hydrogels

Yang

et al. 2020

Macro Materials & Eng

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The self‐healable hydrogels have attracted increasing attention due to their promising potential for ensuring the durability and reliability of hydrogels. However, they still face a serious challenge to achieve a positive balance between mechanical and healing performance, especially for the room‐temperature autonomous self‐healable hydrogels. Herein, a simple but efficient strategy to fabricate a kind of dynamic boronate and hydrogen bonds dual‐crosslinked double network (DN) hydrogel based on a UV‐initiated one‐pot in situ polymerization of N‐acryloyl glycinamide (NAGA) in polyvinyl alcohol‐borax slime is reported. The obtained PN‐x/PB hydrogels, especially with high content of PNAGA, are shown to possess high mechanical strength, high toughness, and fatigue‐resistance properties as well as excellent self‐healability at room temperature (nearly 88% self‐healing efficiency based on the strain compression test), due to the dynamic DN structure, and the combination of the adaptable and reconfigurable dynamic boronate bonds and hydrogen bonds. Considering the easily available materials and simple preparation process, this novel strategy should offer not only a kind of dynamic DN hydrogel with robust mechanical performance and high self‐healing capability, but also enrich the methodological toolbox for synergistic integration of dynamic covalent bonds and hydrogen bonds to surmount the tradeoff between mechanical properties and self‐healing capacity of hydrogels.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Facile Strategy for Synergistic Integration of Dynamic Covalent Bonds and Hydrogen Bonds to Surmount the Tradeoff between Mechanical Property and Self‐Healing Capacity of Hydrogels

Yang

et al. 2020

Macro Materials & Eng

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“…Poly(acrylic acid)-based hydrogels and their derivatives have carboxylic pendant groups that are hydrophilic and contribute to ion exchange capacity . Furthermore, these hydrophilic carboxylic groups can interact with multiple water molecules when hydrated, strengthening the polymer matrix due to the presence of both a covalently cross-linked network and physical cross-links due to hydrogen bonding …”

Section: Introductionmentioning

confidence: 99%

“…25 Furthermore, these hydrophilic carboxylic groups can interact with multiple water molecules when hydrated, strengthening the polymer matrix due to the presence of both a covalently cross-linked network and physical cross-links due to hydrogen bonding. 26 By utilizing emerging additive manufacturing techniques such as 3D printing, soft actuators can be fabricated in complex geometries. Furthermore, material properties are tunable by adjusting the precursor solution composition.…”

Section: Introductionmentioning

confidence: 99%

Poly(acrylic acid)-Based Hydrogel Actuators Fabricated via Digital Light Projection Additive Manufacturing

Wang

Alizadeh

Barde

et al. 2022

ACS Appl. Polym. Mater.

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Electroactive polymers that exhibit controlled deformation under an applied electric field, either in liquid or air, have great potential as soft robotic actuators. However, materials for soft robotics currently face challenges, including slow response, high actuation potential, and a lack of underlying mechanistic understanding. Additionally, fabrication of soft robotic actuators with complex design features has historically been restricted by two-dimensional fabrication methods. In this work, we investigate cross-linked poly(acrylic acid)-based actuators prepared utilizing digital light projection (DLP), an additive manufacturing technique that enables fabrication of actuators with complex geometries. A series of photopolymerizable inks are prepared incorporating acrylic acid (monomer), trimethylolpropane trimethacrylate (cross-linker), and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide (photoinitiator). Soft actuators are 3D-printed utilizing a commercial DLP 3D printer operating under 405 nm UV light. These 3D-printed actuators exhibit large deformation (up to 43°), high actuation speed (up to 1.08°/s), and stable actuation performance for bending cycles under relatively low actuation voltage (4–6 V). Factors such as acrylic acid content, cross-linker concentration, actuator thicknesses, and electric field strength are varied, and their impact on the 3D-printed actuators are evaluated and discussed. Lastly, a membrane valve actuator is fabricated, and its ability to open and close under applied potential is demonstrated.

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“…Whereas, water molecules would weaken the strength of the intermolecular and intramolecular hydrogen bonds, hence lowering the self-healing efficiency. 36 The synthesis of the hydrogel involves the polymerization of acrylic acid monomers in glass moulds, where ammonia persulfate (APS) and N,N'-methylenebisacrylamide (MBAA) were utilized as initiator and crosslinking agent, respectively (Figure 1c).…”

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confidence: 99%

A Wavy-Structured Highly Stretchable Thermoelectric Generator with Stable Energy Output and Self-Rescuing Capability

et al. 2021

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Thermoelectric generators (TEGs) demonstrate great potential for flexible and wearable electronics due to the direct electrical energy harvesting from waste heat. Good wearability requires high mechanical flexibility and preferable stretchability, while current TEGs are primarily developed with rigid or non-stretchable components, which cannot well conform to human skin or accommodate human motions, thus hindering further applications. Herein, a wavy architecture is proposed for the fabrication of stretchable TEGs, where a stretchable and self-healable hydrogel is employed as device substrate, and intrinsically flexible highperformance TE films are attached to form wavy morphologies. The wavy-structured TEG can be readily stretched to 300%, and in the meantime can sustain a stable energy output with more than 90% TE performance retained, which outperforms most of the reported state-of-the-art TE materials and TEGs. It also demonstrates a desired device-level self-rescuing capability originated from the effective self-healing of the hydrogel and the wavy structure of TE legs, thereby providing persistent energy supply upon injuries or damages. This work offers a promising approach for the design of next-generation stretchable and wearable TEGs.

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Ultra stretchable, tough and self-healable poly(acrylic acid) hydrogels cross-linked by self-enhanced high-density hydrogen bonds

Cited by 27 publications

References 50 publications

A Facile Strategy for Synergistic Integration of Dynamic Covalent Bonds and Hydrogen Bonds to Surmount the Tradeoff between Mechanical Property and Self‐Healing Capacity of Hydrogels

A Facile Strategy for Synergistic Integration of Dynamic Covalent Bonds and Hydrogen Bonds to Surmount the Tradeoff between Mechanical Property and Self‐Healing Capacity of Hydrogels

Poly(acrylic acid)-Based Hydrogel Actuators Fabricated via Digital Light Projection Additive Manufacturing

A Wavy-Structured Highly Stretchable Thermoelectric Generator with Stable Energy Output and Self-Rescuing Capability

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