An “Off‐the‐Shelf” Shape Memory Hydrogel Based on the Dynamic Borax‐Diol Ester Bonds

Zhang, Yuchong; Le, Xiaoxia; Lü, Wei; Jian, Yukun; Zhang, Jiawei; Chen, Tao

doi:10.1002/mame.201800144

Cited by 31 publications

(17 citation statements)

References 40 publications

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“…One of the intrinsic mechanisms of shape memory of the PVA/PNAGA hydrogels can be ascribed to the dynamic equilibrium and bond rearrangement between boronate esters and boronic acids/diols of PVA. [ 30–32 ] The cis‐diols of PVA in PVA/PNAGA hydrogels can react with borax to form dynamic boronate bonds and generate the corresponding temporary shape property. In addition, the dynamic boronate bonds are highly pH‐dependent and reversible.…”

Section: Resultsmentioning

confidence: 99%

“…[ 20,21,28 ] Various physical interactions and dynamic covalent bonds as well as supramolecular crosslinking have been introduced into DN hydrogels to improve the self‐healability, but their mechanical strength was usually sacrificed. [ 19–21,29–33 ] Furthermore, the functionality of current DN hydrogels is commonly too monotonous to meet various requirements, [ 2–4 ] as many technological and scientific applications of hydrogels require a synergetic integration of excellent fatigue resistance, multi‐shape memory and fast actuation, stimuli responsiveness as well as good biocompatibility. [ 1–4 ] However, the previously reported hydrogels usually possess only one of the above‐mentioned critical functionalities.…”

Section: Introductionmentioning

confidence: 99%

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A Facile Strategy to Achieve Synergistic Multiple Hydrogen Bonding Interactions for Constructing Robust Hydrogels with Self‐healing Capability, Shape Transformation and Actuation Function

Yang

Valenzuela

Dong

et al. 2021

Macro Chemistry & Physics

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The double network (DN) hydrogels, especially the physically crosslinked DN hydrogels, have attracted increasing attention due to their high reconfigurability, multi‐sensitivity, and efficient energy dissipation, but their applications still suffer from the relatively low mechanical strength, complex preparation process, and insufficient functionality. In this work, a simple but efficient strategy to fabricate robust and multitasking polyvinyl alcohol (PVA)/poly(N‐acryloyl glycinamide) (PNAGA) DN hydrogels via an ultraviolet (UV)‐initiated one‐pot in situ polymerization and a subsequent freezing‐thawing treatment is reported. The PVA/PNAGA DN hydrogels are fully physically linked DN network via multiple hydrogen bonding interactions, which contain hard PVA crystalline microdomains and soft PNAGA regions. The synergetic multiple hydrogen bonding interactions and the cooperation of hard and soft regions in PVA/PNAGA hydrogels as well as the polyhydroxy matrix can not only impart the PVA/PNAGA hydrogels with super mechanical strength, high toughness, good stretchability, and rapid shape‐recoverability, but also endow the hydrogels with tailorable self‐healability, multiple shape memory, and actuation function. Considering the easily available materials, simple preparation process, and highly multitasking properties, this novel strategy should greatly enrich the methodological toolbox for the synthesis of robust and multifunctional hydrogels for the diversity of applications.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Facile Strategy to Achieve Synergistic Multiple Hydrogen Bonding Interactions for Constructing Robust Hydrogels with Self‐healing Capability, Shape Transformation and Actuation Function

Yang

Valenzuela

Dong

et al. 2021

Macro Chemistry & Physics

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“…Zhang et al 69 have implemented a synthesis of polyacrylamide (PAAm)/polyvinyl acetate (PVA)–borate hydrogel system to investigate shape memory characteristics by utilizing high‐efficiency borate ester bonds. In Figure 5, polyvinyl acetate (PVA) was dissolved in deionized water.…”

Section: Syntheses Of Smesmentioning

confidence: 99%

“…Moreover, R f increased with by increasing the solvent concentration from 0.01 to 0.08 M. It is likely because excessive borax concentration can cause higher crosslink density of temporary boronate ester bond. The shape memory process unexpectedly became faster under wetter conditions 69 …”

Section: Syntheses Of Smesmentioning

confidence: 99%

Shape memory elastomers: A review of synthesis, design, advanced manufacturing, and emerging applications

Prathumrat

Nikzad

Hajizadeh

et al. 2022

Polymers for Advanced Techs

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Shape memory elastomers (SMEs) are a class of intelligent materials characterized by their ability to deform and recover shapes under applied force and external stimuli. Heat and ultraviolet radiation are examples of the most common external stimuli. With the emerging prevalence of internet of things devices and the ensuing need for smart materials and structures, SMEs provide significant opportunities to support the development of novel applications in robotics, remotely actuated systems, and packages, including those promised for the space industry. To harness the immense potential in the emerging applications of these materials, one approach is the systematic multi‐scale modeling coupled with artificial intelligence‐assisted design leading to the development of next‐generation intelligent systems. This review covers several aspects of the synthesis/materials chemistry and applications of SMEs with a view towards enabling such an approach. The synthesis procedures emphasizing dynamic covalent bond reactions are reviewed. Then, liquid crystalline elastomers are introduced as a specific elastomeric material class that exhibits excellent shape memory characteristics and distinctive transition temperatures. The utilization of advanced manufacturing methods such as additive manufacturing, three‐dimensional printing, and the emerging four‐dimensional printing technologies assisted by machine learning are detailed in producing and predicting SMEs. Finally, the current trends in the use of SMEs are summarized in areas of industrial and space engineering and biomedical applications.

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“…According to reported method previously. 45,46 Firstly, the temporary "U" shapes were fixed by external force at room temperature, the shape fixity ratio was around 41.1% (Figure S1 and Table S2). Then, −15 C was chosen to fix the temporary "U" shapes.…”

Section: Shape-memory Experimentsmentioning

confidence: 99%

Multi‐functional polyurethane composites with self‐healing and shape memory properties enhanced by graphene oxide

Luo

Guo

et al. 2021

J of Applied Polymer Sci

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Development of shape memory polymer materials with integrated self-healing ability, shape memory property, and outstanding mechanical properties is a challenge. Herein, isophorone diisocyanate, polytetramethylene ether glycol, dimethylglyoxime, and glycerol have been used to preparation polyurethane by reacting at 80 C for 6 h. Then, graphene oxide (GO) was added and the reaction keep at 80 C for 4 h to obtain polyurethane/GO composite with selfhealing and shape memory properties. Scanning electron microscopy shows that the GO sheets were dispersed uniformly in the polyurethane matrix. The thermal stability was characterized by thermogravimetric analyses. The tensile test shows that the Young's modulus of the composites increases from 38.57 ± 4.35 MPa for pure polyurethane to 95.36 ± 10.35 MPa for the polyurethane composite with a GO content of 0.5 wt%, and the tensile strength increases from 6.28 ± 0.67 to 15.65 ± 1.54 MPa. The oxime carbamate bond and hydrogen bond endow the composite good self-healing property. The healing efficiency can reach 98.84%. In addition, the composite has excellent shape memory property, with a shape recovery ratio of 88.6% and a shape fixation ratio of 55.2%. This work provides a promising way to fabricate stimulusresponsive composite with versatile functions.

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An “Off‐the‐Shelf” Shape Memory Hydrogel Based on the Dynamic Borax‐Diol Ester Bonds

Cited by 31 publications

References 40 publications

A Facile Strategy to Achieve Synergistic Multiple Hydrogen Bonding Interactions for Constructing Robust Hydrogels with Self‐healing Capability, Shape Transformation and Actuation Function

A Facile Strategy to Achieve Synergistic Multiple Hydrogen Bonding Interactions for Constructing Robust Hydrogels with Self‐healing Capability, Shape Transformation and Actuation Function

Shape memory elastomers: A review of synthesis, design, advanced manufacturing, and emerging applications

Multi‐functional polyurethane composites with self‐healing and shape memory properties enhanced by graphene oxide

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