Synthesis and properties of powdery hydrogels based on acrylamide, methacrylamide, and their N‐substituted derivatives

Lopour, P.; Ševčík, Stanislav; Labský, J.; Lednický, F.

doi:10.1002/apmc.1996.052430113

Cited by 8 publications

(1 citation statement)

References 5 publications

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“…It has been shown in previous studies [1][2][3] that powdery hydrogels based on acrylamide, methacrylamide or their Nsubstituted derivatives may be used for the synthesis of silicone rubber-hydrogel composites which are suitable for biomedical and technical use. In this respect, polyacrylamide hydrogels seem to be the best as compared with the other hydrogels mentioned, owing to their high rate of swelling, high specific surface area, and relatively low content of water-soluble low-molecular-weight compounds.…”

Section: Introductionmentioning

confidence: 99%

Shape memory of composites based on silicone rubber and polyacrylamide hydrogel

Hron¹,

Šlechtová

1999

Angew. Makromol. Chem.

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The shape memory of hydrophilic composite materials based on silicone rubber and slightly crosslinked polyacrylamide, which is a non‐ionic hydrogel, has been studied. Before the shape memory testing, it was necessary to determine the glass transition temperature (Tg) of the slightly crosslinked polyacrylamide as well as the mechanical properties of the composites at temperatures above Tg of a crosslinked polyacrylamide. Afterwards, the shape memory of the composite material was tested by performing a set of simple experiments based on deformation and heating of test pieces, their subsequent cooling and deformation force removing, and their repeated heating or water swelling, during which the residual elongation was measured and calculated. The composite material shaped in this way resumes its original shape if it is again heated above Tg of the crosslinked polyacrylamide or allowed to swell in distilled water. There exists a limiting concentration of hydrogel phase (approx. 30 phr), which is limited by good dispersion and good contact of hydrogel particles within the silicone matrix, under which the shape memory does not occur, and above which it exists.

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Section: Introductionmentioning

confidence: 99%

Shape memory of composites based on silicone rubber and polyacrylamide hydrogel

Hron¹,

Šlechtová

1999

Angew. Makromol. Chem.

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Hydrogels

Cai

Gupta

2002

Kirk-Othmer Encyclopedia of Chemical Technology

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Hydrogels are hydrophilic polymer networks that are able to swell and retain large amounts of water and maintain three‐dimensional swollen structures. These hydrogels do not dissolve in water. Common monomers and polymerization methods are discussed, specially for poly(2‐hydroxyethyl methacrylate), poly(acrylic/methacrylic acid), poly(vinyl alcohol), poly(ethylene glycol), poly(acrylamide), poly( n ‐vinyl 2‐pyrrolidone), and polyurethane hydrogels. In addition, the synthesis and the mechanism of biodegradable hydrogels are discussed. Responsive hydrogels can reversibly change volume in response to slight changes in the properties of the medium including pH, temperature, electric field, ionic strength, salt type, solvent, external stress, or light. Responsive hydrogels are finding new applications because of their interesting properties. Microgels are cross‐linked latex microparticles, that are swollen by a good solvent and have globular structure. Due to their compact structure, the intrinsic viscosities of these microgels are much lower than those of corresponding linear or branched polymers. Hydrogels are applied in molecular separation based on size exclusion, protein isolation by conjugating, in drug delivery, as artificial organs, in tissue engineering, in would dressings, for fire protection, and as a superabsorbent material in diapers, water‐sealing construction materials, and water retention in agricultural applications. Most hydrogel are highly biocompatible and have extremely low toxicity to the human body, eg, hydrogel products such as contact lenses and surgical dressings are being used successfully.

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Hydrogels

Cai¹,

Gupta²,

Staff³

2012

Kirk-Othmer Encyclopedia of Chemical Technology

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Hydrogels are hydrophilic polymer networks that are able to swell and retain large amounts of water and maintain three‐dimensional swollen structures. These hydrogels do not dissolve in water. Common monomers and polymerization methods are discussed as well as synthesis and mechanism of biodegradable hydrogels. Responsive hydrogels can reversibly change volume in response to slight changes in the properties of the medium including pH, temperature, electric field, ionic strength, salt type, solvent, external stress or light. Microgels are cross‐linked microparticles that are swollen by a good solvent and have globular structure. Due to their compact structure the intrinsic viscosities of these microgels are much lower than those of the corresponding liner or branched polymers. Hydrogels are used in molecular separation based on size exclusion, protein isolation by conjugating, in drug delivery, as artificial organs, in tissue engineering, in wound dressings, as fire protection, as superabsorbent material in diapers, water sealing, agricultural applications, and in cosmetics products. For cosmetics, hydrogels provide emulsion stability and conditioning, and therapeutics agents can be added to the hydrogel.

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Synthesis and properties of powdery hydrogels based on acrylamide, methacrylamide, and their N‐substituted derivatives

Cited by 8 publications

References 5 publications

Shape memory of composites based on silicone rubber and polyacrylamide hydrogel

Shape memory of composites based on silicone rubber and polyacrylamide hydrogel

Hydrogels

Hydrogels

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