High-strength semi-crystalline hydrogels with self-healing and shape memory functions

Kurt, Burcu; Gulyuz, Umit; Demir, Damla D.; Okay, Oğuz

doi:10.1016/j.eurpolymj.2016.05.019

Cited by 54 publications

(72 citation statements)

References 50 publications

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“…Shape memory and self‐healing (SM&SH) polymer has been extensively investigated due to its wide applications in many fields . Among them, shape memory and self‐healing biocompatible hydrogel attracts much attention due to its biological applications, such as tissue engineering, arthrodial cartilage, and artificial skin . In such a hydrogel, a 3D physically or chemically cross‐linked network is required to maintain the permanent shape, while the fixing of temporary shape generally can be achieved by phase transition temperature T tr (glass transition temperature T g or melting temperature T m ) .…”

Section: Introductionmentioning

confidence: 99%

Polydopamine Particles Reinforced Poly(vinyl alcohol) Hydrogel with NIR Light Triggered Shape Memory and Self‐Healing Capability

Yang

Wang

Fei

et al. 2017

Macromol. Rapid Commun.

105

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following freezing/thawing under strain, which induces the second cross-linking due to crystallization of PVA chains. The reversible formation and melting of PVA crystallites enables the temporary shape fixation and recovery. Chen et al. also constructed a shape memory hydrogel based on stronger and weaker H-bonding by introducing tannic acid (TA) into the PVA hydrogel networks. The stronger multiple H-bonding between PVA chains and TA acts as the permanent cross-links and the weaker H-bonding among PVA chains works as the temporary cross-links. [20] However, the shape memory and selfhealing PVA hydrogel still encounters some challenges. The first is how to control the SM&SH process spatially and temporally by appropriate stimulus. Most SM&SH hydrogels were thermally activated, but one disadvantage is that the direct heating will lead to temperature rising of the entire material. [21,22] Other stimulating means such as air, water, and pH can also trigger the shape recovery, but those stimuli are limited in practical applications. [23][24][25][26] In contrast, the remote stimulations such as ultrasound and light are very easy to achieve local focus and quantitative stimulation. [27,28] Previously we firstly proposed the use of therapeutic ultrasound to trigger the shape memory of a PVA hydrogel containing a small amount of melamine. [19] In this study, we will try to use near-infrared (NIR) to trigger the SM&SH process by employing the photothermal effect of polydopamine. As a safe and noncontact stimulus, NIR light is widely used in the field of biomedicine. Huang et al. proposed a one-pot method to produce a double network containing both permanent and temporary cross-linking structures through chemically cross-linked polyacrylamide (PAM) and physically cross-linked gelatin. Graphene oxide (GO) was introduced into the hydrogel matrix to serve as energy convertor to convert NIR irradiation to thermal energy. [29] Although GO has been widely used as nearinfrared light energy convertor, the dispersion problem and the interaction with the matrix are the bottlenecks that limit its application. [30,31] The second challenge is the contradiction between mechanical strength and self-healing performance. In most cases, the hydrogel with self-healing function has a lower mechanical strength, which in practice means no useful in many circumstances. There are some approaches to improve the mechanical properties of hydrogels, such as introducing physical and chemical cross-linkers or reinforced fillers. [32][33][34] HydrogelsThis study focuses on developing a facile approach to prepare biocompatible poly(vinyl alcohol) (PVA) composite hydrogels containing polydopamine particles (PDAPs) with ultrafast near-infrared (NIR) light-triggered shape memory and self-healing capability. The PVA-PDAPs composite hydrogels with excellent mechanical properties can be achieved after freezing/thawing treatment, and the formation of physically cross-linked networks from the hydrogen bonding (H-bonding) between PVA and PDAPs. Due to the exce...

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Section: Introductionmentioning

confidence: 99%

Polydopamine Particles Reinforced Poly(vinyl alcohol) Hydrogel with NIR Light Triggered Shape Memory and Self‐Healing Capability

Yang

Wang

Fei

et al. 2017

Macromol. Rapid Commun.

105

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“…After swelling in water, hydrogels with water contents between 7 and 56% were obtained. The melting temperature T m and the degree of crystallinity were between 36-56°C and 3-33%, and they increased with increasing hydrophobic monomer content, or by replacing C17.3M units with C18A ones [20].…”

Section: Self-healing and Shape-memory Hydrogelsmentioning

confidence: 99%

“…The flexibility of hydrophilic PDMAA and PAAc network chains in water provides alignment of the hydrophobic units to form crystalline regions. The hydrogels exhibit 120-to 1000-fold change in the modulus by changing the temperature between below and above T m ( Figure 15) [20]. This significant modulus variation depending on temperature provides effective self-healing and shape-memory functions to the hydrogels.…”

Section: Self-healing and Shape-memory Hydrogelsmentioning

confidence: 99%

Self-Healing and Shape-Memory Hydrogels

Okay

2020

Hacettepe Journal of Biology and Chemistry

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B iyolojik sistemlere büyük bir benzerlik gösteren hidrojeller yumuşak ve akıllı malzemelerdir. Mekanik olarak dayanıklı ve tok hidrojellerin üretimi konusunda geçen on yılda önemli ilerlemeler sağlanmıştır. Jel biliminde mevcut diğer büyük zorluk ise hidrojellerin kullanım ömürlerinin uzatılması için onlara kendini onarım ve şekil-hafıza fonksiyonlarının kazandırılmasıdır. Bu derlemede, kendini onarabilen ve şekil-hafızalı hidrojeller alanında son gelişmeleri sunuyorum. Anahtar Kelimeler Hidrojeller, kendini onarma, şekil-hafıza.

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“…Recently, the designing of hydrophobic monomers with new chemical structure to fabricate hydrophobic interaction-based hydrogel has made great progress. [19][20][21] For example, Arindam Banerjee report a series of amphiphilic tyrosine based selfhealable metallo-hydrogels and one single amino acid (phenylalanine) based pyrene conjugated low molecular weight hydrogelator. 22,23 The stiffness and self-healing property of the amphiphilic tyrosine-based hydrogels can be nicely tuned by varying the alkyl chain length of these amphiphiles and the phenylalanine (Phe) derivative-based hydrogel shown well super-gelation efficiency and thixotropic property.…”

Section: Introductionmentioning

confidence: 99%

Effects of amphiphilic monomers and their hydrophilic spacers on polyacrylamide hydrogels

Liu

et al. 2019

RSC Adv.

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High-strength semi-crystalline hydrogels with self-healing and shape memory functions

Cited by 54 publications

References 50 publications

Polydopamine Particles Reinforced Poly(vinyl alcohol) Hydrogel with NIR Light Triggered Shape Memory and Self‐Healing Capability

Polydopamine Particles Reinforced Poly(vinyl alcohol) Hydrogel with NIR Light Triggered Shape Memory and Self‐Healing Capability

Self-Healing and Shape-Memory Hydrogels

Effects of amphiphilic monomers and their hydrophilic spacers on polyacrylamide hydrogels

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