Strong, tough and mechanically self-recoverable poly(vinyl alcohol)/alginate dual-physical double-network hydrogels with large cross-link density contrast

Li, Xuefeng; Shu, Mengmeng; Li, Han; Gao, Xiang; Long, Shijun; Hu, Tao; Wu, Chonggang

doi:10.1039/c8ra01302k

Cited by 48 publications

(35 citation statements)

References 29 publications

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“…The gel strength of the hydrogel increased by 19.4% after incorporation of 2 wt% of PVA. The increase of gel strength can be ascribed to the enhancement of the interaction among PVA chains and the grafting polymer chains ( Li et al, 2018 ). PVA chains containing numerous –OH groups and –C=O groups was interpenetrated within the polymer network, which may form hydrogen bonding interaction with the –COO – , -OH, and -COOH groups in the SA- g -PNaA network and tangled with the grafted polymer chains to generate a physical crosslinking domain.…”

Section: Resultsmentioning

confidence: 99%

Fast and Highly Efficient Adsorption Removal of Toxic Pb(II) by a Reusable Porous Semi-IPN Hydrogel Based on Alginate and Poly(Vinyl Alcohol)

et al. 2021

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A porous semi-interpenetrating network (semi-IPN) hydrogel adsorbent with excellent adsorption properties and removal efficiency towards Pb(II) was prepared by a facile grafting polymerization reaction in aqueous medium using natural biopolymer sodium alginate (SA) as the main chains, sodium acrylate (NaA) as the monomers, and poly(vinyl alcohol) (PVA) as the semi-IPN component. FTIR, TGA and SEM analyses confirm that NaA monomers were grafted onto the macromolecular chains of SA, and PVA chains were interpenetrated and entangled with the crosslinked network. The incorporation of PVA facilitates to form pores on the surface of hydrogel adsorbent. The semi-IPN hydrogel containing 2 wt% of PVA exhibits high adsorption capacity and fast adsorption rate for Pb(II). The best adsorption capacity reaches 784.97 mg/g, and the optimal removal rate reaches 98.39% (adsorbent dosage, 2 g/L). In addition, the incorporation of PVA improved the gel strength of hydrogel, and the storage modulus of hydrogel increased by 19.4% after incorporating 2 wt% of PVA. The increase of gel strength facilitates to improve the reusability of hydrogel. After 5 times of regeneration, the adsorption capacity of SA-g-PNaA decreased by 23.2%, while the adsorption capacity of semi-IPN hydrogel only decreased by 10.8%. The adsorption kinetics of the hydrogel in the initial stage (the moment when the adsorbent contacts solution) and the second stage are fitted by segmentation. It is intriguing that the adsorption kinetics fits well with both pseudo-second-order kinetic model and pseudo-first-order model before 60 s, while only fits well with pseudo-second-order adsorption model in the whole adsorption process. The chemical complexing adsorption mainly contribute to the efficient capturing of Pb(II).

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Section: Resultsmentioning

confidence: 99%

Fast and Highly Efficient Adsorption Removal of Toxic Pb(II) by a Reusable Porous Semi-IPN Hydrogel Based on Alginate and Poly(Vinyl Alcohol)

et al. 2021

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“…A borax solution (8 % wt) was mixed with the hydrogel and then immersed in a CaCl 2 solution (1 mol L −1 ). The resulting hydrogel encompassed borax crosslinked PVA networks and calcium crosslinked alginate networks as described by Li et al (2018) and Han, Lei, and Wu (2014). Moreover, Na + , Ca + , Cl‾ ions were present from the CaCl2-alginate exchange and B(OH) 4 ‾ ions from borax.…”

Section: Alginatementioning

confidence: 90%

Polysaccharide-based triboelectric nanogenerators: A review

Torres

De-la-Torre

2021

Carbohydrate Polymers

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Triboelectric nanogenerators (TENGs) are versatile electronic devices used for environmental energy harvesting and self-powered electronics with a wide range of potential applications. The rapid development of TENGs has caused great concern regarding the environmental impacts of conventional electronic devices. Under this context, researching alternatives to synthetic and toxic materials in electronics are of major significance. In this review, we focused on TENGs based on natural polysaccharide materials. Firstly, a general overview of the working mechanisms and materials for high-performance TENGs were summarized and discussed. Then, the recent progress of polysaccharide-based TENGs along with their potential applications reported in the literature from 2015 to 2020 was reviewed. Here, we aimed to present polysaccharide polymers as a promising and viable alternative to the development of green TENGs and tackle the challenges of recycling e-wastes.

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“…Polysaccharides (i.e., cellulose, alginate, and chitosan) have abundant hydroxyl groups on backbones, which could form hydrogen bonding with other polymer such as PVA to form self‐healing composite hydrogels. [ 62,63,124 ] When TA was employed to modify the CNCs, mussel‐inspired hydrogels with high mechanical self‐healing properties via extensive multihydrogen bonding were achieved. [ 63 ]…”

Section: Applications Of Polysaccharide‐based Hydrogelsmentioning

confidence: 99%

Recent advances in polysaccharide‐based hydrogels for synthesis and applications

Lin

2021

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158

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Hydrogels are three‐dimensional (3D) crosslinked hydrophilic polymer networks that have garnered tremendous interests in many fields, including water treatment, energy storage, and regenerative medicine. However, conventional synthetic polymer hydrogels have poor biocompatibility. In this context, polysaccharides, a class of renewable natural materials with biocompatible and biodegradable properties, have been utilized as building blocks to yield polysaccharide‐based hydrogels through physical and/or chemical crosslinking of polysaccharides via a variety of monomers or ions. These polysaccharide‐derived hydrogels exhibit peculiar physicochemical properties and excellent mechanical properties due to their unique structures and abundant functional groups. This review focuses on recent advances in synthesis and applications of polysaccharide‐based hydrogels by capitalizing on a set of biocompatible and biodegradable polysaccharides (i.e., cellulose, alginate, chitosan, and cyclodextrins [CDs]). First, we introduce the design and synthesis principles for crafting polysaccharide‐based hydrogels. Second, polysaccharide‐based hydrogels that are interconnected via various crosslinking strategies (e.g., physical crosslinking, chemical crosslinking, and double networking) are summarized. In particular, the introduction of noncovalent and/or dynamic covalent interactions imparts polysaccharide‐based hydrogels with a myriad of intriguing performances (e.g., stimuli–response and self‐recovery). Third, the diverse applications of polysaccharide‐based hydrogels in self‐healing, sensory, supercapacitor, battery, drug delivery, wound healing, tissues engineering, and bioimaging fields are discussed. Finally, the perspectives of polysaccharide‐based hydrogels that promote their future design to enable new functions and applications are outlined.

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Strong, tough and mechanically self-recoverable poly(vinyl alcohol)/alginate dual-physical double-network hydrogels with large cross-link density contrast

Abstract: Intermediate compositions enable synergised, strong-and-tough dual-physical double-network hydrogels of dispersion-induced rigid, ionic alginate-networks interlocking with global ductile, hydrogen-bonded poly(vinyl alcohol)-network.

Cited by 48 publications

References 29 publications

Fast and Highly Efficient Adsorption Removal of Toxic Pb(II) by a Reusable Porous Semi-IPN Hydrogel Based on Alginate and Poly(Vinyl Alcohol)

Fast and Highly Efficient Adsorption Removal of Toxic Pb(II) by a Reusable Porous Semi-IPN Hydrogel Based on Alginate and Poly(Vinyl Alcohol)

Polysaccharide-based triboelectric nanogenerators: A review

Recent advances in polysaccharide‐based hydrogels for synthesis and applications

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