Properties and toughening mechanisms of PVA/PAM double-network hydrogels prepared by freeze-thawing and anneal-swelling

Ou, Kangkang; Dong, Xia; Qin, Chengling; Ji, Xinan; He, Ji‐Huan

doi:10.1016/j.msec.2017.03.287

Cited by 127 publications

(83 citation statements)

References 56 publications

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“…Figure presents the FTIR spectra of AM, SA, and Fe 3 O 4 /PAM/SA–Zr before and after phosphate adsorption. For AM [Figure (a)], the peaks located at 3352 and 3183 cm −1 represented the −NH 2 stretching vibrations, and the peaks at 1674 and 1614 cm −1 originated from C=O and C=C stretching vibrations, respectively . In the spectra of SA, the broad band at 3433 cm −1 corresponded to hydroxyl groups, and the peaks at 1618 and 1415 cm −1 were caused by symmetric and asymmetric stretching vibrations of COO − groups, respectively .…”

Section: Resultsmentioning

confidence: 99%

Amino‐functionalized magnetic zirconium alginate beads for phosphate removal and recovery from aqueous solutions

Luo

Rong

Zhang

et al. 2018

J of Applied Polymer Sci

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Amino‐functionalized magnetic zirconium alginate beads with an interpenetrating network (Fe3O4/PAM/SA–Zr) were prepared, characterized, and then tested as a novel biomass adsorbent for phosphate removal and recovery. The hydrogel beads exhibited outstanding thermostability and possessed a magnetic response. The effects of the pH, dosage, initial phosphate concentration, interference ions, and temperature on the removal of phosphate were investigated. The kinetics, isotherms, and thermodynamics of the adsorption were studied. Notably, the adsorption of phosphate was endothermic, feasible, and spontaneous with a maximum uptake capacity of 42.23 mg‐P/g at an optimized pH of 2.0. The phosphate could be desorbed effectively with a 0.2 mol/L NaOH solution, and the adsorbent exhibited a good reusability. The possible adsorption mechanisms were verified by zeta potential, Fourier transform infrared spectroscopy, and X‐ray photoelectron spectroscopy analyses. Continuous phosphate‐adsorption tests were conducted in a fixed‐bed columns packed with Fe3O4/PAM/SA–Zr, and the breakthrough curves were predicted by the Adams–Bohart, Thomas, and Yoon–Nelson models, respectively. The suitability of the hydrogel beads for the treatment of real wastewater was also tested. These hydrogel beads should be a promising adsorbent for phosphate removal and recovery from aqueous solutions, with the advantages of a high uptake capacity, good reusability, and easy magnetic separation. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 46897.

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Section: Resultsmentioning

confidence: 99%

Amino‐functionalized magnetic zirconium alginate beads for phosphate removal and recovery from aqueous solutions

Luo

Rong

Zhang

et al. 2018

J of Applied Polymer Sci

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“…Hydrogel, a three-dimensional cross-linked hydrophilic polymer network owing to the similarity in the structure and some attributes of soft tissue is widely used to develop scaffolds for tissue engineering 7,8 . Synthetic polymeric hydrogels such as polyvinyl alcohol, Polyethylene glycol, and Polyacrylamide are commonly used synthetic for hydrogels preparation 9–11 . However, the biocompatibility and cell proliferation ability severely restrict their application in vivo .…”

Section: Introductionmentioning

confidence: 99%

Nanohydroxyapatite Reinforced Chitosan Composite Hydrogel with Tunable Mechanical and Biological Properties for Cartilage Regeneration

Kumar

Isloor

Kumar

et al. 2019

Sci Rep

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With the continuous quest of developing hydrogel for cartilage regeneration with superior mechanobiological properties are still becoming a challenge. Chitosan (CS) hydrogels are the promising implant materials due to an analogous character of the soft tissue; however, their low mechanical strength and durability together with its lack of integrity with surrounding tissues hinder the load-bearing application. This can be solved by developing a composite chitosan hydrogel reinforced with Hydroxyapatite Nanorods (HANr). The objective of this work is to develop and characterize (physically, chemically, mechanically and biologically) the composite hydrogels loaded with different concentration of hydroxyapatite nanorod. The concentration of hydroxyapatite in the composite hydrogel was optimized and it was found that, reinforcement modifies the hydrogel network by promoting the secondary crosslinking. The compression strength could reach 1.62 ± 0.02 MPa with a significant deformation of 32% and exhibits time-dependent, rapid self-recoverable and fatigue resistant behavior based on the cyclic loading-unloading compression test. The storage modulus value can reach nearly 10 kPa which is needed for the proposed application. Besides, composite hydrogels show an excellent antimicrobial activity against Escherichia coli, Staphylococcus aureus bacteria’s and Candida albicans fungi and their cytocompatibility towards L929 mouse fibroblasts provide a potential pathway to developing a composite hydrogel for cartilage regeneration.

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“…In tandem, freeze–thaw cycles to enhance crystalline domains and additive reinforcement to promote hydrogen bonding combine to form a double‐network hydrogel of PVA. [ 5,6,69,70 ] Each additive was selected for its ability to act as both a hydrogen bond acceptor and hydrogen bond donor. Furthermore, these additives were selected for their ability to mix with PVA at a molecular level for simple solution blending and processability.…”

Section: Introduction Of Synthetic Hydrogelsmentioning

confidence: 99%

Tensile Fatigue of Poly(Vinyl Alcohol) Hydrogels with Bio‐Friendly Toughening Agents

Koshut

Smoot

Rummel

et al. 2020

Macro Materials & Eng

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Inspired by the avoidance of toxic chemical crosslinkers and harsh reaction conditions, this work describes a poly(vinyl alcohol)‐based (PVA) double‐network (DN) hydrogel aimed at maintaining biocompatibility through the combined use of bio‐friendly additives and freezing–thawing cyclic processing for the application of synthetic soft‐polymer implants. This DN hydrogel is studied using techniques that characterize both its chemical and mechanical behavior. A variety of bio‐friendly additives are screened for their effectiveness at improving the toughness of the PVA hydrogel system in monotonic tension. Starch is selected as the best additive for further tensile testing as it brings about a near 30% increase in ultimate tensile strength and maintains ease of processing. This PVA–starch DN sample is then studied for its tensile fatigue properties through cyclic, strain‐controlled testing to develop a fatigue life curve. Though an increase in monotonic tensile strength is observed, the PVA–starch DN hydrogel does not bring about an improvement in the fatigue behavior as compared to the control. Although synthetic hydrogel reinforcement is widely researched, this work presents the first fatigue analysis of its kind and it is intended to serve as a guide for future fatigue studies of reinforced hydrogels.

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Properties and toughening mechanisms of PVA/PAM double-network hydrogels prepared by freeze-thawing and anneal-swelling

Cited by 127 publications

References 56 publications

Amino‐functionalized magnetic zirconium alginate beads for phosphate removal and recovery from aqueous solutions

Amino‐functionalized magnetic zirconium alginate beads for phosphate removal and recovery from aqueous solutions

Nanohydroxyapatite Reinforced Chitosan Composite Hydrogel with Tunable Mechanical and Biological Properties for Cartilage Regeneration

Tensile Fatigue of Poly(Vinyl Alcohol) Hydrogels with Bio‐Friendly Toughening Agents

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