Water‐swellable, tough, and stretchable inorganic–organic sulfoaluminate cement/polyacrylamide double‐network hydrogel composites

Chu, Yao Yao; Song, Xuefeng; Zhao, Hongbo

doi:10.1002/app.47905

Cited by 24 publications

(8 citation statements)

References 47 publications

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“…Recent research reports attempt to improve the mechanical properties of hydrogels, such as nanocomposite hydrogels, dual cross-linked networks, the addition of particles and fibers for reinforced materials, APCNs, − and other diverse hydrogel-reinforcing mechanisms such as ion-coordinating and polyion-complex hydrogels, , tetra(polyethylene glycol) gels, or hydrophilic–hydrophobic copolymer networks. , Thus, different types of strengthening mechanisms by physical and chemical interactions, such as covalent, ionic, and hydrogen bonding as well as complex coordination and hydrophobic interaction have been used to improve the stiffness, strength, and toughness.…”

Section: Introductionmentioning

confidence: 99%

Improving the Strength of Ultrastiff Organic–Inorganic Double-Network Hydrogels

et al. 2021

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Swollen double networks (DNs) are hydrogels with greatly improved stiffness, toughness, and strength compared to classical hydrogels. The highest stiffness is achieved for organic− inorganic DN hydrogels, which show a rather low tensile strength of about 1 MPa so far. It was presumed that this is due to an insufficient reversible bond formation between inorganic and organic phases. Therefore, the influence of the functional groups that form reversible bonds between these two phases was investigated on the example of calcium phosphate-based DN hydrogels. The functional groups were introduced by copolymerization of acrylate-based monomers with acrylamide and N,Ndimethylacrylamide, respectively, to form a hydrogel-containing alkaline phosphatase. After enzyme-induced mineralization, it was found that only acrylic acid (AA) results in improved strength of the formed ultrastiff DN hydrogels. Stress−strain curves with different strain rates revealed that Young's modulus of ∼300 MPa is constant in all cases, while the tensile strength increases from 7 MPa at 5% min −1 to 17 MPa at 750% min −1 . The fracture toughness of these optically transparent DN hydrogels, which are among the stiffest and strongest existing hydrogels, is up to 2000 J m −2 which is also improved by the introduction of AA into the hydrogel.

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Section: Introductionmentioning

confidence: 99%

Improving the Strength of Ultrastiff Organic–Inorganic Double-Network Hydrogels

et al. 2021

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“…The reaction of cement with water and the polymerization of AM are all exothermic processes. 39,40 As shown in Fig. 2A, a strong and narrow peak, which is attributed to the gelation of AM, existed in all the PC/PAM blends within the rst hour of reaction and contributed greatly to the cumulative heat released.…”

Section: Reaction Of Pc/pam Composites Without Contaminantsmentioning

confidence: 98%

“…3C and D are in agreement with the literature. 40,46 Comparing to PC/PAM composites, cement paste had a higher strength (about 1320 kPa) but a poorer ductility at 3 days age. Among these PC/PAM composites, PC120/PAM8 had the highest tensile strength of 1200 kPa and an elongation of 100%, while for PC60/PAM8, the strength and elongation were 156 kPa and 740% and for PC30/PAM8, they were 70 kPa and 800%.…”

Section: Mechanical Properties Of Pc/pam Compositesmentioning

confidence: 99%

Rapid solidification of Portland cement/polyacrylamide hydrogel (PC/PAM) composites for diverse wastewater treatments

Pan

Zhang

2020

RSC Adv.

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“…The development and synthesis of hydrogels with good mechanical properties are of high relevance to many research areas, such as biomaterials, tissue engineering [1,2] and regenerative medicine [3][4][5], soft actuators [6,7] and smart materials [8,9], flexible electronics [10,11], membranes [12][13][14], ion exchange materials [15] and many more. In addition to fiberreinforced materials [16], nanocomposite hydrogels [17], dual cross-linked networks [18], amphiphilic polymer conetworks (APCNs) [19][20][21][22][23][24][25] and other diverse hydrogel-reinforcing mechanisms [26], double-network (DN) hydrogels have recently received increasing attention for improving the mechanical properties of hydrogels [27][28][29][30]. DN hydrogels are composed of two hydrophilic networks that form interpenetrating structures through a two-step polymerization.…”

Section: Introductionmentioning

confidence: 99%

Enzyme-induced mineralization of hydrogels with amorphous calcium carbonate for fast synthesis of ultrastiff, strong and tough organic–inorganic double networks

et al. 2021

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Hydrogels with good mechanical properties have great importance in biological and medical applications. Double-network (DN) hydrogels were found to be very tough materials. If one of the two network phases is an inorganic material, the DN hydrogels also become very stiff without losing their toughness. So far, the only example of such an organic–inorganic DN hydrogel is based on calcium phosphate, which takes about a week to be formed as an amorphous inorganic phase by enzyme-induced mineralization. An alternative organic–inorganic DN hydrogel, based on amorphous CaCO3, which can be formed as inorganic phase within hours, was designed in this study. The precipitation of CaCO3 within a hydrogel was induced by urease and a urea/CaCl2 calcification medium. The amorphous character of the CaCO3 was retained by using the previously reported crystallization inhibiting effects of N-(phosphonomethyl)glycine (PMGly). The connection between organic and inorganic phases via reversible bonds was realized by the introduction of ionic groups. The best results were obtained by copolymerization of acrylamide (AAm) and sodium acrylate (SA), which led to water-swollen organic–inorganic DN hydrogels with a high Young’s modulus (455 ± 80 MPa), remarkable tensile strength (3.4 ± 0.7 MPa) and fracture toughness (1.1 ± 0.2 kJ m−2). Graphical Abstract The present manuscript describes the method of enzymatic mineralization of hydrogels for the production of ultrastiff and strong composite hydrogels. By forming a double-network structure based on an organic and an inorganic phase, it is possible to improve the mechanical properties of a hydrogel, such as stiffness and strength, by several orders of magnitude. The key to this is the formation of a percolating, amorphous inorganic phase, which is achieved by inhibiting crystallization of precipitated amorphous CaCO3 with N-(phosphonomethyl)glycine and controlling the nanostructure with co polymerized sodium acrylate. This creates ultrastiff, strong and tough organic–inorganic double-network hydrogels.

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Water‐swellable, tough, and stretchable inorganic–organic sulfoaluminate cement/polyacrylamide double‐network hydrogel composites

Cited by 24 publications

References 47 publications

Improving the Strength of Ultrastiff Organic–Inorganic Double-Network Hydrogels

Improving the Strength of Ultrastiff Organic–Inorganic Double-Network Hydrogels

Rapid solidification of Portland cement/polyacrylamide hydrogel (PC/PAM) composites for diverse wastewater treatments

Enzyme-induced mineralization of hydrogels with amorphous calcium carbonate for fast synthesis of ultrastiff, strong and tough organic–inorganic double networks

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