Biomimetic anisotropic poly(vinyl alcohol) hydrogels with significantly enhanced mechanical properties by freezing–thawing under drawing

Chen, Yuanyuan; Jiao, Chen; Peng, Xin; Liu, Tianqi; Shi, Yunqi; Min, Liang; Wang, Huiliang

doi:10.1039/c9tb00372j

Cited by 54 publications

(38 citation statements)

References 38 publications

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“…Hydrogels with ordered anisotropic structures [1,2], similar to biological tissues [3-6], have promising applications in the fields of actuators and sensors [7][8][9]. To build the anisotropic structure in hydrogels, self-assembly through intermolecular interactions was used [10], and external field effects, such as electrical field [11], magnetic field [12][13][14][15][16][17], mechanical-strain-induced (stretch) [18][19][20][21][22][23][24][25][26][27][28], shear-force-induced [29,30] and directional freezing [31], have been employed. Currently, hydrogels prepared by the above mentioned methods achieve anisotropic properties [7][8][9], such as anisotropic optical properties [14, 22,32], mechanical performances [18], actuating abilities [14,33] and electrical conductivity [11].…”

Section: Introductionmentioning

confidence: 99%

Anisotropic nanocomposite hydrogels with enhanced actuating performance through aligned polymer networks

et al. 2020

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Anisotropic composite hydrogels have wide applications in the fields of materials for actuators and sensors. Herein, we report an anisotropic composite hydrogel prepared by a mechanical-strain-induced method. Polymer networks including poly(N-isopropylacrylamide) (PNIPAM) and sodium alginate (SA), as well as carbon nanotubes (CNTs) are found to align simultaneously by stretching, and then fixed by physical crosslinking through non-covalent bonds. Composite hydrogels with doubly aligned polymer networks showed anisotropic optical and mechanical properties. The actuation performance of the anisotropic composite hydrogels as compared with the isotropic ones was found to be enhanced, which showed the capability of lifting 100 times its weight with 20% contraction strain. Besides, a bilayer hydrogel was designed to bend with a maximum of 390°to mimic the tendril behavior of plants.

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Section: Introductionmentioning

confidence: 99%

Anisotropic nanocomposite hydrogels with enhanced actuating performance through aligned polymer networks

et al. 2020

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“…To quantitatively compare the crystallinity of the PDN PVA/Alg hydrogels, XRD characterizations were carried out on the hydrogels. According to previous reports, PVA crystallization show a sharp crystalline peak at 2θ = 19.4°, a shoulder peak in the range of 21.9 ~ 23° and a weak peak in 39.5 ~ 43°, corresponding to the (101), (200) and (102) planes of the PVA crystallites, respectively 22,23 . Alginate also crystallizes due to the presence of calcium ions at 2θ = 32°, 34° and 45°, 24 but the crystallization peaks of alginate in XRD patterns of the PDN PVA/Alg hydrogels almost negligible.…”

Section: Methodsmentioning

confidence: 55%

“…Alginate also crystallizes due to the presence of calcium ions at 2θ = 32°, 34° and 45°, 24 but the crystallization peaks of alginate in XRD patterns of the PDN PVA/Alg hydrogels almost negligible. Accordingly, the degrees of crystallinity (DC) of the hydrogels were approximately evaluated by the DC of PVA from the following equation 22,23

DC = A_{1} / A_{2} \times 100 % .

where A 1 and A 2 represent the total of the areas of the three crystallization peaks of PVA and the area subtending the whole diffraction profile of the PDN PVA/Alg hydrogels, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…According to previous reports, PVA crystallization show a sharp crystalline peak at 2θ = 19.4 , a shoulder peak in the range of 21.9~23 and a weak peak in 39.5~43 , corresponding to the (101), (200) and (102) planes of the PVA crystallites, respectively. 22,23 Alginate also crystallizes due to the presence of calcium ions at 2θ = 32 , 34 and 45 , 24 but the crystallization peaks of alginate in XRD patterns of the PDN PVA/Alg hydrogels almost negligible. Accordingly, the degrees of crystallinity (DC) of the hydrogels were approximately evaluated by the DC of PVA from the following equation.…”

Section: Crystallinity Calculationmentioning

confidence: 99%

“…Accordingly, the degrees of crystallinity (DC) of the hydrogels were approximately evaluated by the DC of PVA from the following equation. 22,23…”

Section: Crystallinity Calculationmentioning

confidence: 99%

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High strength and toughness of double physically cross‐linked hydrogels composed of polyvinyl alcohol and calcium alginate

Chen

Yang

Shi

et al. 2020

J of Applied Polymer Sci

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The weak mechanical properties of hydrogels, especially physically crosslinked hydrogels are usually a major factor to hinder their application. To solve this problem, in this work, we prepared a high strength and toughness of double physically cross-linked (PDN) hydrogels composed of crystalline domain cross-linked polyvinyl alcohol (PVA) and Ca 2+-cross-linked alginate (Alg). With a further annealing treatment, the noncovalent cross-linked network via

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Facile preparation of transparent poly (γ‐glutamic acid) modified poly (vinyl alcohol) hydrogels with high tensile strength and toughness

Chen

Kim

et al. 2022

J of Applied Polymer Sci

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In the present work, a transparent poly (γ‐glutamic acid) modified polyvinyl alcohol (γ‐PGA/PVA) hydrogel with excellent tensile strength and toughness was prepared by a simple and effective immersion method. Results revealed that γ‐PGA concentration and immersion time have great influence on the mechanical properties of prepared γ‐PGA/PVA hydrogels. The mechanical tensile strength of γ‐PGA/PVA hydrogel reached to 16.68 ± 0.43 MPa with the strain of 511.64% ± 23.38% when prepared PVA hydrogel was immersed in 20% γ‐PGA solution for 24 h (denoted as 20% γ‐PGA/PVA). Meanwhile, 20% γ‐PGA/PVA hydrogel exhibited excellent mechanical properties, such as high‐level torsion, knotting and puncture resistant, and can lift a 5 kg weight without obvious rupture. The morphology, structure, compositions and mechanism of enhanced mechanical properties were investigated. Besides the excellent mechanical properties, 20% γ‐PGA/PVA hydrogel possessed good conductivity as well as high sensitivity to external strain. Furthermore, in vitro good cytocompatibility of 20% γ‐PGA/PVA hydrogels was demonstrated by using MC3T3‐E1 cells. Therefore, the prepared 20% γ‐PGA/PVA hydrogel may provide the possibility for the applications in the field of cartilage repair/regeneration, artificial skin and human motion sensor.

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Biomimetic anisotropic poly(vinyl alcohol) hydrogels with significantly enhanced mechanical properties by freezing–thawing under drawing

Abstract: Anisotropic poly(vinyl alcohol) hydrogels with significantly enhanced mechanical properties are prepared by a freezing–thawing under drawing (FTD) method.

Cited by 54 publications

References 38 publications

Anisotropic nanocomposite hydrogels with enhanced actuating performance through aligned polymer networks

Anisotropic nanocomposite hydrogels with enhanced actuating performance through aligned polymer networks

High strength and toughness of double physically cross‐linked hydrogels composed of polyvinyl alcohol and calcium alginate

Facile preparation of transparent poly (γ‐glutamic acid) modified poly (vinyl alcohol) hydrogels with high tensile strength and toughness

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