Swelling and mechanical properties of superabsorbent hydrogels based on Tara gum/acrylic acid synthesized by gamma radiation

Alla, Safaa G. Abd; Şen, Murat; El‐Naggar, Abdel Wahab M.

doi:10.1016/j.carbpol.2012.03.031

Cited by 125 publications

(42 citation statements)

References 28 publications

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“…SAPs generally compose of ionic monomers and need a low cross-linking density, to create a large fluid uptake capacity. SAPs can take up and hold aqueous solutions up to several hundred times its own weight [20,25,26,27,28,29,30,31,32,33] as can be seen in Figure 1, while retaining it even under pressure [25,28]. For the intended application in concrete, the swelling of the SAP is one of the most important characteristics.…”

Section: Superabsorbent Polymersmentioning

confidence: 99%

Crack Mitigation in Concrete: Superabsorbent Polymers as Key to Success?

et al. 2017

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Cracking is a major concern in building applications. Cracks may arise from shrinkage, freeze/thawing and/or structural stresses, amongst others. Several solutions can be found but superabsorbent polymers (SAPs) seem to be interesting to counteract these problems. At an early age, the absorbed water by the SAPs may be used to mitigate autogenous and plastic shrinkage. The formed macro pores may increase the freeze/thaw resistance. The swelling upon water ingress may seal a crack from intruding fluids and may regain the overall water-tightness. The latter water may promote autogenous healing. The use of superabsorbent polymers is thus very interesting. This review paper summarizes the current research and gives a critical note towards the use of superabsorbent polymers in cementitious materials.

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Section: Superabsorbent Polymersmentioning

confidence: 99%

Crack Mitigation in Concrete: Superabsorbent Polymers as Key to Success?

et al. 2017

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“…Also, because synthesis time is short, a greater number of functional groups remain in the graft copolymers or hydrogels. For example, hydrogel polymers of AA with tara gum ( Caesalpinia spinosa ) synthesized using γ‐radiation‐induced graft copolymerization have improved mechanical and swelling properties than those of tara gum itself …”

Section: Graft Copolymerization Of Gum Polysaccharidesmentioning

confidence: 99%

Recent Progress on the Design and Applications of Polysaccharide‐Based Graft Copolymer Hydrogels as Adsorbents for Wastewater Purification

Mittal

Ray

Okamoto

2016

Macro Materials & Eng

127

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Gum polysaccharides are one of the most abundant bio‐based polymers. They are generally derived from plants as exudates or from microorganisms and have diverse applications in many industries, especially in the food industries where they are used as emulsifiers and thickeners. In their natural form, gum polysaccharides have poor mechanical and physical properties; therefore, they are frequently modified with various synthetic monomers such as acrylamide and acrylic acid using graft copolymerization. Graft copolymerization is one of the most trusted and widely used synthetic methods for the modification of gum polysaccharides. Gum polysaccharides modified in this way have improved mechanical and physicochemical properties. Furthermore, gum polysaccharides contain a variety of functional groups, for example, carboxylic acid and hydroxyl groups; therefore, they have been used extensively as adsorbents for the removal of different impurities from wastewater such as toxic heavy metal cations and synthetic dyes. Here, the chemical and physical properties of gum polysaccharides, different methods of graft copolymerization, and the use of graft copolymer gum‐polysaccharide‐based hydrogels are reviewed in detail for the removal of toxic heavy metal cations and synthetic dyes from aqueous solutions.

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“…For the determining of pH-dependent swelling behavior of hydrogels, dried samples were placed in buffer solutions with different pH value ranging from 3.0 to 11.0 to swell for 36 h. After that, the weight of the sample was measured gravimetrically and the swelling ratio at each pH value was calculated according to Equation 1.…”

Section: Swelling Measurementsmentioning

confidence: 99%

“…In recent years remarkable attention has been centered on super adsorbent hydrogels that are able to adsorb large amount of industrial or physiological fluids without disintegrating (1)(2)(3). Super adsorbent hydrogels undergo volume phase transition due to their response to the environmental stimuli such as pH, temperature, ionic strength; this leads to a change in water content of hydrogel network.…”

Section: Introductionmentioning

confidence: 99%

A Novel Triple-Responsive Hydrogels Based on 2-(Dimethylamino) Ethyl Methacrylate by Copolymerization With 2-(N-morpholino) Ethyl Methacrylate

Taktak

Yildiz

Sert

et al. 2014

Journal of Macromolecular Science, Part A

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A novel triple responsive copolymer hydrogels composed of 2-(dimethylamino) ethyl methacrylate and 2-(N-morpholino) ethyl methacrylate monomers were prepared through free radical polymerization. The structure and morphology of the hydrogels were examined by using infrared spectroscopy (ATR-IR) and scanning electron microscopy (SEM). It was found that poly (DMAEMAco-MEMA) hydrogels exhibited pH-dependent smart swelling and shrinking behavior in buffer solutions which is ascribed to the protonation/deprotonation of the tertiary amine pendant groups of both monomers. The copolymerization of more hydrophobic MEMA monomer with hydrophilic DMAEMA monomer created associated micro domain in the hydrogel structure which is able to induce reversible phase transition of the hydrogel. Therefore, poly (DMAEMA-co-MEMA) hydrogels displayed rapidly responses to the increasing temperature and divalent salt effects by shrink-type behavior. Such a multi-responsive network structure would be very beneficial for biomedical applications.

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Swelling and mechanical properties of superabsorbent hydrogels based on Tara gum/acrylic acid synthesized by gamma radiation

Cited by 125 publications

References 28 publications

Crack Mitigation in Concrete: Superabsorbent Polymers as Key to Success?

Crack Mitigation in Concrete: Superabsorbent Polymers as Key to Success?

Recent Progress on the Design and Applications of Polysaccharide‐Based Graft Copolymer Hydrogels as Adsorbents for Wastewater Purification

A Novel Triple-Responsive Hydrogels Based on 2-(Dimethylamino) Ethyl Methacrylate by Copolymerization With 2-(N-morpholino) Ethyl Methacrylate

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