Self-healing quadruple-shape memory hydrogel based on imine, coordination, and borate bonds with tunable mechanical properties

Wang, Minying; Mo, Baohang; Chen, Birong; Jiang, Long; Yang, Hua

doi:10.1007/s00396-020-04613-8

Cited by 8 publications

(3 citation statements)

References 21 publications

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“…They have promising applications in medical devices, textiles, aerospace, and so forth. [45,216,217] Hydrogels can be used as substrates for shape memory materials due to their excellent ion transport properties which allow them to respond promptly to subtle environmental changes or stimuli (e.g., electric fields, pressure, etc.). [218][219][220][221] Xiong et al [212] added naturally non-toxic tea polyphenols to PVA and improved its shape memory under hot water stimulation through the rich hydrogen bonding between PVA and tea polyphenols.…”

Section: Shape Memory Hydrogelmentioning

confidence: 99%

The synthesis, mechanisms, and additives for bio‐compatible polyvinyl alcohol hydrogels: A review on current advances, trends, and future outlook

Yang

Wang

et al. 2022

Vinyl Additive Technology

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Vinyl polymers are widely used in biological, textile and industrial applications and are currently attracting research attention for specialized bio‐based applications. Polyvinyl alcohol (PVA) hydrogels show great advantages as a material with high biocompatibility, permeability, hydrophilicity, and low‐friction coefficient, allowing applications as smart materials, wound dressings, and flexible sensors. However, the poor mechanical properties of PVA hydrogels and biocompatibility less than natural polymers make them unsuitable in practical applications. Additives are often added to PVA hydrogels to enhance mechanical properties, endow more compatibility, functionality and expand their application range. Among them, bio‐additives such as nanocellulose, natural polysaccharides and proteins are biodegradable, biocompatible, and inexpensive, broadening their applications in the biomedical and tissue engineering fields. This work reviews the synthesis of PVA hydrogels, methods to enhance their mechanical properties, types of bio‐additives incorporated for biocompatibility, their mechanism of interaction with PVA and future prospects of PVA composite bio‐hydrogels for application in various fields. Representative cases are carefully selected and discussed with regard to their composition and pros and cons are discussed. Finally, future requirements, as well as the opportunities and challenges of these bio‐additives for improving the multifunctionality of PVA hydrogels are also presented.

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Section: Shape Memory Hydrogelmentioning

confidence: 99%

The synthesis, mechanisms, and additives for bio‐compatible polyvinyl alcohol hydrogels: A review on current advances, trends, and future outlook

Yang

Wang

et al. 2022

Vinyl Additive Technology

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“… 118 A hydrogel was prepared by copolymerization of acrylamide, oxidized sodium alginate (OSA), and PVA, whose multiple-shape memory behaviours were based on imine, coordination, and borate bonds. 119 A temporary shape could be fixed by a treatment of borax solution for borate bonds were formed, and original shape could be recovered by soaking in acetic acid solutions for the borate ester bonds were destroyed.…”

Section: Classifications Of Smpsmentioning

confidence: 99%

A review of shape memory polymers based on the intrinsic structures of their responsive switches

et al. 2021

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“…For permanent cross-link, covalent bonds are often used. For reversible cross-link, various physical interactions and dynamic chemical bonds have been explored, such as hydrophobic interaction, metal–ligand coordination, host–guest interaction, hydrogen bonding, crystallization, , and reversible covalent bonds such as phenyl-boronate ester, imine bond, disulfide bond, etc. These different chemistries also enable different stimuli responsiveness, such as light, heat, pH, CO 2 , etc.…”

Section: Introductionmentioning

confidence: 99%

3D Printing of Biocompatible Shape-Memory Double Network Hydrogels

Chen

Huang

2020

ACS Appl. Mater. Interfaces

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Shape-memory hydrogels can be fixed to an arbitrary temporary shape and recover their permanent shape under appropriate stimulus conditions. Their shape-memory behavior and biocompatible mechanical and chemical properties impart them with many biomedical applications. However, like most hydrogels, traditional shape-memory hydrogels suffer from intrinsic brittleness due to the network inhomogeneity and high water content. In the past, the double network (DN) scheme has been proved a robust method to improve the mechanical performance of hydrogels. Although 3D printing of DN hydrogels has been realized before, 3D printable shape-memory DN hydrogels have not been achieved so far. In this work, we propose a one-pot method for printing a biocompatible shape-memory DN hydrogel via fused deposition method. The two networks incorporated to the hydrogel ink are polyacrylamide (PAAm) and gelatin. The PAAm network is covalently cross-linked and responsible for the permanent shape, while the gelatin network has thermoreversible cross-links and responsible for fixing the temporary shape. The DN hydrogel shows 3 to 7 times higher fracture toughness than a single network gelatin or PAAm hydrogel and can be fixed to 300% of its original length under tension and 10% of its original thickness under compression. The ink compositions are tuned for optimal printing quality and shape-memory performance. The robust mechanical integrity and dramatic shape transformation capability of the 3D-printed shape-memory DN hydrogel will open-up new potential applications in transformative medical robots and self-deployable devices.

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Self-healing quadruple-shape memory hydrogel based on imine, coordination, and borate bonds with tunable mechanical properties

Cited by 8 publications

References 21 publications

The synthesis, mechanisms, and additives for bio‐compatible polyvinyl alcohol hydrogels: A review on current advances, trends, and future outlook

The synthesis, mechanisms, and additives for bio‐compatible polyvinyl alcohol hydrogels: A review on current advances, trends, and future outlook

A review of shape memory polymers based on the intrinsic structures of their responsive switches

3D Printing of Biocompatible Shape-Memory Double Network Hydrogels

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