Ionically crosslinked chitosan/poly(acrylic acid) hydrogels with high strength, toughness and antifreezing capability

Cao, Jinfeng; Wang, Yang; He, Chen; Kang, Yong-Koo; Zhou, Jinping

doi:10.1016/j.carbpol.2020.116420

Cited by 48 publications

(32 citation statements)

References 42 publications

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“…Hydrogels are polymers with a three-dimensional cross-linked structure containing hydrophilic groups capable of absorbing water. 12 Hydrogels can be made using natural polymers such as alginate, chitosan, gelatin, starch, gellan gum, and cellulose. [13][14][15][16][17][18] In addition, hydrogels manufactured using synthetic polymers such as polyvinyl alcohol (PVA), polyvinyl pyrrolidone (PVP), polyethylene glycol (PEG), and polyacrylic acid (PAA) have the advantage of better mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

A freeze–thaw PVA hydrogel loaded with guava leaf extract: physical and antibacterial properties

et al. 2021

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Section: Introductionmentioning

confidence: 99%

A freeze–thaw PVA hydrogel loaded with guava leaf extract: physical and antibacterial properties

et al. 2021

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“…In recent years, several studies have been undertaken in hydrogel materials of acrylic acid (AA)-grafted polysaccharides, namely CMC-g-PAA [24], chitosan/PAA [25], PAA-hydroxyethyl cellulose [26], Amylose-g-PAA [27] and various AA-grafted polysaccharides [28,29] for superabsorbent, waste water treatment and biomedical applications. Until now, ionically cross-linked nanoporous hydrogel beads of CMC-g-poly (sodium acrylate) (PNaA) have not been reported.…”

Section: Introductionmentioning

confidence: 99%

Nanoporous Sodium Carboxymethyl Cellulose-g-poly (Sodium Acrylate)/FeCl3 Hydrogel Beads: Synthesis and Characterization

Kumar

Priyadarshi

Sauraj

et al. 2020

Gels

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Novel sodium carboxymethyl cellulose-g-poly (sodium acrylate)/Ferric chloride (CMC-g-PNaA/FeCl3) nanoporous hydrogel beads were prepared based on the ionic cross-linking between CMC-g-PNaA and FeCl3. The structure of CMC and CMC-g-PNaA were elucidated by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR) spectroscopy, and the elemental composition was analyzed by energy dispersive X-ray analysis (EDX). The physicochemical properties of the CMC-g-PNaA/FeCl3 hydrogel beads were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and thermogravimetric analysis (TGA). The swelling percentage of hydrogel beads was studied at different time periods. The obtained CMC-g-PNaA/FeCl3 hydrogel beads exhibited a higher nanoporous morphology than those of CMC-g-PNaA and CMC beads. Furthermore, an AFM image of the CMC-g-PNaA/FeCl3 beads shows granule type topology. Compared to the CMC-g-PNaA (189 °C), CMC-g-PNaA/FeCl3 hydrogel beads exhibited improvement in thermal stability (199 °C). Furthermore, CMC-g-PNaA/FeCl3 hydrogel beads depicted a higher swelling percentage capacity of around 1452%, as compared to CMC-g-PNaA (1096%). Moreover, this strategy with preliminary results could be useful for the development of polysaccharide-based hybrid hydrogel beads for various potential applications.

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“…On the contrary, aSC-DH gel retained its flexibility after being cooled to −60°C. Compared to other works on freeze-resistant tough hydrogels shown in Figure 3 B, our material has superior mechanical performances at low temperature ( Cao et al., 2020 ; Morelle et al., 2018 ; Liu et al., 2020b ; Hu et al., 2020 ; Yang et al., 2021 ). This aSC-DH gel has over 10-time higher toughness than other works at low temperature (−45°C).…”

Section: Resultsmentioning

confidence: 67%

Tendon-inspired anti-freezing tough gels

Duan

Hua

et al. 2021

iScience

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Summary Hydrogels have gained tremendous attention due to their versatility in soft electronics, actuators, biomedical sensors, etc. Due to the high water content, hydrogels are usually soft, weak, and freeze below 0°C, which brings severe limitations to applications such as soft robotics and flexible electronics in harsh environments. Most existing anti-freezing gels suffer from poor mechanical properties and urgently need further improvements. Here, we took inspirations from tendon and coniferous trees and provided an effective method to strengthen polyvinyl alcohol (PVA) hydrogel while making it freeze resistant. The salting-out effect was utilized to create a hierarchically structured polymer network, which induced superior mechanical properties (Young's modulus: 10.1 MPa, tensile strength: 13.5 MPa, and toughness: 127.9 MJ/m 3 ). Meanwhile, the cononsolvency effect was employed to preserve the structure and suppress the freezing point to −60°C. Moreover, we have demonstrated the broad applicability of our material by fabricating PVA hydrogel-based hydraulic actuators and ionic conductors.

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Ionically crosslinked chitosan/poly(acrylic acid) hydrogels with high strength, toughness and antifreezing capability

Cited by 48 publications

References 42 publications

A freeze–thaw PVA hydrogel loaded with guava leaf extract: physical and antibacterial properties

A freeze–thaw PVA hydrogel loaded with guava leaf extract: physical and antibacterial properties

Nanoporous Sodium Carboxymethyl Cellulose-g-poly (Sodium Acrylate)/FeCl3 Hydrogel Beads: Synthesis and Characterization

Tendon-inspired anti-freezing tough gels

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