Dual Physically Cross-Linked Double Network Hydrogels with High Mechanical Strength, Fatigue Resistance, Notch-Insensitivity, and Self-Healing Properties

Yuan, Ningxiao; Xu, Lu; Wang, Hualiang; Fu, Youpeng; Zhang, Zhe; Liu, Lan; Wang, Cuiling; Zhao, Jianhao; Rong, Jian

doi:10.1021/acsami.6b12243

Cited by 200 publications

(144 citation statements)

References 54 publications

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“…Meanwhile, the melamine‐reinforced hydrogels display a self‐healing function with the healing efficiency of 50–70% . In another example, a dual physically crosslinked polyacrylamide (PAM)/xanthan gum DN hydrogel exhibited high fracture stresses (3.64 MPa), but low self‐healing properties (below 70%) . Thus, up to now, it is still a challenge to prepare the self‐healing hydrogels with high strength (above 1 MPa) and high self‐healing efficiency (above 90%).…”

Section: Introductionmentioning

confidence: 99%

A Robust, Self‐Healable, and Shape Memory Supramolecular Hydrogel by Multiple Hydrogen Bonding Interactions

Feng

Zuo

Gao

et al. 2018

Macromol. Rapid Commun.

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A versatile double-network (DN) hydrogel with two noncovalent crosslinked networks is synthesized by multiple hydrogen bonding (H-bonding) interactions. The DN hydrogels are synthesized via a heating-cooling photopolymerization process by adding all reactants of agar, N-acryloyl glycinamide (NAGA) and N-benzylacrylamide (NBAA) monomers, UV initiators to a single water pot. Poly(N-acryloyl glycinamide-co-N-benzyl acrylamide) (P(NAGA-co-NBAA)) with a triple amide in one side group is synthesized via UV-light polymerization between NAGA and NBAA, forming a strong intermolecular H-bonding network. Meanwhile, the intramolecular H-bonding network is formed between P(NAGA-co-NBAA) and agars. The sol-gel phase transition of agars at 86 °C generates the molecular entanglement network. Such a double network enables the hydrogel high self-healing efficiency (about 95%), good shape memory ability, and high mechanical strength (1.1 MPa). Additionally, the DN hydrogel is completely crosslinked by multiple hydrogen bonds (H-bonds) and the physical crosslinking of agar without extra potential toxic chemical crosslinker. The DN hydrogels find extensive applications in the biomedical materials due to their excellent biocompatibility.

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Section: Introductionmentioning

confidence: 99%

A Robust, Self‐Healable, and Shape Memory Supramolecular Hydrogel by Multiple Hydrogen Bonding Interactions

Feng

Zuo

Gao

et al. 2018

Macromol. Rapid Commun.

View full text Add to dashboard Cite

show abstract

“…But, the rupture of the first network on successive loading will lead to permanent internal damage due to the irreversibility of covalent bond, making DN hydrogels show stress‐induced softening and poor fatigue resistance . To improve the fatigue resistance of DN hydrogels, noncovalently linked network has been used to design hybrid physically chemically and fully physically crosslinked DN hydrogels. However, the common problem existed in most of these hydrogels is they have low tensile strength and elastic modulus.…”

Section: Introductionmentioning

confidence: 99%

A Dual‐Crosslinked Strategy to Construct Physical Hydrogels with High Strength, Toughness, Good Mechanical Recoverability, and Shape‐Memory Ability

Qin

Niu

Tang

et al. 2017

Macro Materials & Eng

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A novel type of physical hydrogel based on dual‐crosslinked strategy is successfully synthesized by micellar copolymerization of stearyl methacrylate, acrylamide, and acrylic acid, and subsequent introduction of Fe3+. Strong hydrophobic associations among poly(stearyl methacrylate) blocks form the first crosslinking point and ionic coordination bonds between carboxyl groups and Fe3+ serve as the second crosslinking point. The mechanical properties of the hydrogel can be tuned in a wide range by controlling the densities of two crosslinks. The optimal hydrogel shows excellent mechanical properties (tensile strength of ≈6.8 MPa, elastic modulus of ≈8.0 MPa, elongation of ≈1000%, toughness of 53 MJ m−3) and good self‐recovery property. Furthermore, owing to stimuli responsiveness of physical interaction, this hydrogel also shows a triple shape memory effect. The combination of two different physical interactions in a single network provides a general strategy for designing of high‐strength hydrogels with functionalities.

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“…However, with the excessive cross‐linking, the network structure was so tight that the water molecules penetrated hardly, and the water content became less. Due to form more brittle polymer, the mechanical properties have declined . When the content of AG was 5%, the hydrogel has good tear resistance and ductility.…”

Section: Resultsmentioning

confidence: 99%

“…However, many dual‐network hydrogels formed by chemically cross‐linked which networks are covalent cross‐linked. Their mechanical performances are comparable to rubber‐based elastomers, such as elastic modulus (0.1–1 MPa), tensile strength (1–10 MPa), etc . Li et at.…”

Section: Introductionmentioning

confidence: 98%

Self‐Healing Hydrogel of Poly (vinyl alcohol)/Agarose with Robust Mechanical Property

et al. 2019

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As promising soft materials, various excellent properties of hydrogels have received widespread attention during recent years. Mechanical properties and self‐healing performance are required characteristics for hydrogels in practical applications. An important challenge is to develop hydrogels exhibiting mechanical performance and self‐recoverability through physical cross‐linking. In this work, the authors report a hydrogel consisting of a fully physically linked poly (vinyl alcohol)/agarose (PVA/AG) dual‐network, which is of high toughness and self‐healing properties. The synthesis process of the PVA/AG hydrogel is convenient, with AG as the first network, and hydrogen bonding and crystal‐associated PVA as the second network to form a dual physical crosslink. Due to this physical cross‐linking, the PVA/AG hydrogel has good mechanical properties (tensile strength of 6.5 MPa to 14.6 MPa, ductility of 168% to 214%). The highest compressive strength of hydrogel is up to 3.66 MPa, which is almost 8 times that of pure PVA hydrogel. In addition, it has excellent self‐healing properties without stimulation or healing agents. Compared to pure PVA hydrogel, PVA/AG hydrogels have higher thermal stability due to higher decomposition temperatures and lower degradation rates. In this study, the authors also initially explore the potential application of obtained hydrogel.

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Dual Physically Cross-Linked Double Network Hydrogels with High Mechanical Strength, Fatigue Resistance, Notch-Insensitivity, and Self-Healing Properties

Cited by 200 publications

References 54 publications

A Robust, Self‐Healable, and Shape Memory Supramolecular Hydrogel by Multiple Hydrogen Bonding Interactions

A Robust, Self‐Healable, and Shape Memory Supramolecular Hydrogel by Multiple Hydrogen Bonding Interactions

A Dual‐Crosslinked Strategy to Construct Physical Hydrogels with High Strength, Toughness, Good Mechanical Recoverability, and Shape‐Memory Ability

Self‐Healing Hydrogel of Poly (vinyl alcohol)/Agarose with Robust Mechanical Property

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