Synthesis of fast-swelling superabsorbent hydrogels: effect of crosslinker type and concentration on porosity and absorption rate

Kabiri, Kourosh; Omidian, Hossein; Hashemi, Seyed Ali; Zohuriaan‐Mehr, M. J.

doi:10.1016/s0014-3057(02)00391-9

Cited by 392 publications

(227 citation statements)

References 24 publications

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“…[25][26][27][28] Even more interesting properties for some applications could be achieved if this introduction of larger micropores or macropores was combined with the effective alignment of those pores, [29] facilitating added benefits such as directional cell growth, [30] extremely low pressure drops, [4] and faster diffusion. [31] The shape and microarchitecture of the pores can also be leveraged to influence phenomena such as oxygen and www.advancedsciencenews.com www.advhealthmat.de nutrient transport as well as cell migration and proliferation within the hydrogel.…”

Section: Introductionmentioning

confidence: 99%

Structured Macroporous Hydrogels: Progress, Challenges, and Opportunities

Hoare

2017

Adv Healthcare Materials

178

168

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Structured macroporous hydrogels that have controllable porosities on both the nanoscale and the microscale offer both the swelling and interfacial properties of bulk hydrogels as well as the transport properties of “hard” macroporous materials. While a variety of techniques such as solvent casting, freeze drying, gas foaming, and phase separation have been developed to fabricate structured macroporous hydrogels, the typically weak mechanics and isotropic pore structures achieved as well as the required use of solvent/additives in the preparation process all limit the potential applications of these materials, particularly in biomedical contexts. This review highlights recent developments in the field of structured macroporous hydrogels aiming to increase network strength, create anisotropy and directionality within the networks, and utilize solvent‐free or additive‐free fabrication methods. Such functional materials are well suited for not only biomedical applications like tissue engineering and drug delivery but also selective filtration, environmental sorption, and the physical templating of secondary networks.

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Section: Introductionmentioning

confidence: 99%

Structured Macroporous Hydrogels: Progress, Challenges, and Opportunities

Hoare

2017

Adv Healthcare Materials

178

168

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“…Since the hydrogels have absorbed water, they are usually biocompatible in nature and are nonirritating to the soft tissues when in contact with them. [1][2][3] The increasing importance of hydrogels in areas such as pharmaceuticals, food chemistry, medicine, and biotechnology has stimulated theoretical and experimental work on the properties of hydrogels in aqueous solutions. Chemically cross-linked gels can be obtained by radical polymerization or cross-linking agents (eg, glutaraldehyde, epichlorohydrin) or can be induced by radiation (eg, UV radiation, gamma radiation).…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of polyvinyl alcohol-gelatin hydrogel membranes for biomedical applications

2007

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The purpose of this research was to design and develop hydrogels by esterification of polyvinyl alcohol (PVA) with gelatin. The membranes were characterized by Fourier Transform Infrared (FTIR) spectroscopy, x-ray diffraction (XRD), and differential scanning calorimetry. The viscosity of the esterified product (as solution) was compared with the mixture of PVA and gelatin of the same composition. The mechanical properties of the hydrogels were characterized by tensile tests. Swelling behavior and hemocompatibility of the membrane were also evaluated. The diffusion coefficient of salicylic acid (SA), when the receptor compartment contained Ringer's solution, through the membrane was determined. SA was used as a model drug. FTIR spectra of the membranes indicated complete esterification of the free carboxylic groups of gelatin. XRD studies indicated that the crystallinity of the membranes was mainly due to gelatin. The comparison of viscosity indicated an increase in segment density within the molecular coil. The membrane had sufficient strength and water-holding capacity. Hemocompatibility suggested that the hydrogel could be tried as wound dressing and as an implantable drug delivery system. The diffusion coefficient of SA through the membrane was found to be 1.32 × 10 −5 cm 2 /s. The experimental results indicated that the hydrogel could be tried for various biomedical applications.

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“…They mainly need several hours to reach maximum absorption capacity. The slow swelling of dried hydrogels is due to the slow diffusion of water into the glassy matrix of the dried hydrogels [9]. Chen and Park developed a new kind of superabsorbent polymers, so called superporous hydrogels [10].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of porous poly(acrylamide) hydrogels using calcium carbonate and its application for slow release of potassium nitrate

Mahdavinia¹,

Mousavi²,

Karimi³

et al. 2009

Express Polym. Lett.

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Abstract. Porous poly(acrylamide) was synthesized using calcium carbonate microparticles and subsequent acid treatment to remove the calcium carbonate. Methylenebisacrylamide and ammonium persulfate/sodium metabisulfite were used as crosslinking agent and redox initiator, respectively. The porous structure of resulted hydrogels was confirmed using SEM micrographs. The effect of methylenebisacrylamide concentration and calcium carbonate amount on the swelling of the hydrogels was investigated. The results showed that the effect of methylenebisacrylamide and calcium carbonate variables on the swelling is reverse. The hydrogels were subsequently utilized for the loading of potassium nitrate. Potassium nitrate as active agent was loaded into hydrogels and subsequently the release of this active agent was investigated. In these series of investigation, the effect of content of loading, methylenebisacrylamide and calcium carbonate amount on the release of potassium nitrate from hydrogels was investigated.

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Synthesis of fast-swelling superabsorbent hydrogels: effect of crosslinker type and concentration on porosity and absorption rate

Cited by 392 publications

References 24 publications

Structured Macroporous Hydrogels: Progress, Challenges, and Opportunities

Structured Macroporous Hydrogels: Progress, Challenges, and Opportunities

Preparation and characterization of polyvinyl alcohol-gelatin hydrogel membranes for biomedical applications

Synthesis of porous poly(acrylamide) hydrogels using calcium carbonate and its application for slow release of potassium nitrate

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