A novel multi-responsive polyampholyte composite hydrogel with excellent mechanical strength and rapid shrinking rate

Xu, Kun; Tan, Ying; Chen, Qiang; An, Hailong; Li, Wenbo; Dong, Lisong; Wang, Pixin

doi:10.1016/j.jcis.2010.01.058

Cited by 54 publications

(29 citation statements)

References 46 publications

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“…This prompted us to investigate the preparation of some novel composites as beads based on CS and the synthetic polycation poly(vinyl amine) (PVAm), which has the highest density of primary amine groups (18 meq/g). PVAm is endowed with a high chelating ability for heavy metal ions [21], and has been recently employed in the synthesis of some composite hydrogels with high mechanical strength [22,23]. It is expected as the presence of PVAm, characterized by a highly flexible chain, to increase the mechanical properties of the composite beads during the consecutive sorption/desorption cycles, and to enhance their reusability.…”

Section: Introductionmentioning

confidence: 99%

Facile fabrication of chitosan/poly(vinyl amine) composite beads with enhanced sorption of Cu2+. Equilibrium, kinetics, and thermodynamics

Drăgan¹,

Cocarta²,

Dinu³

2014

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

Facile fabrication of chitosan/poly(vinyl amine) composite beads with enhanced sorption of Cu2+. Equilibrium, kinetics, and thermodynamics

Drăgan¹,

Cocarta²,

Dinu³

2014

Chemical Engineering Journal

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“…The nanocomposite hydrogels with clay crosslinkers are very elastic and have much better stimuli-responsive property than normal hydrogels; however, their thermo-responsive equilibrium swelling ratio is still limited, for example, the thermo-responsive equilibrium swelling ratio in responding to temperature changing from 50 °C to 20 °C is typically<3,200% (refs 21, 22). More recently, macromolecular microspheres have been utilized as building blocks or covalent crosslinkers to form either rapidly responsive hydrogels24252627 or highly elastic hydrogels2829. However, all the macromolecular microspheres used for synthesizing microsphere-composited hydrogels are as large as sub-micron or even micron in diameter, much larger than the clay nanoparticles22.…”

mentioning

confidence: 99%

Nano-structured smart hydrogels with rapid response and high elasticity

et al. 2013

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Smart hydrogels, or stimuli-responsive hydrogels, are three-dimensional networks composed of crosslinked hydrophilic polymer chains that are able to dramatically change their volume and other properties in response to environmental stimuli such as temperature, pH and certain chemicals. Rapid and significant response to environmental stimuli and high elasticity are critical for the versatility of such smart hydrogels. Here we report the synthesis of smart hydrogels which are rapidly responsive, highly swellable and stretchable, by constructing a nano-structured architecture with activated nanogels as nano-crosslinkers. The nano-structured smart hydrogels show very significant and rapid stimuli-responsive characteristics, as well as highly elastic properties to sustain high compressions, resist slicing and withstand high level of deformation, such as bending, twisting and extensive stretching. Because of the concurrent rapid and significant stimuli-response and high elasticity, these nano-structured smart hydrogels may expand the scope of hydrogel applications, and provide enhanced performance in their applications.

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“…The hydrated hydrogel is swollen below the LCST, whereas the dehydrated hydrogel shrinks and forms a collapsed above the LCST (Caykara et al 2006, Xu et al 2010. Thermosensitive acrylamide-based hydrogels are various applications such as water desalination and water purification (Kudaibergenov 2002), immunoassays (Hirokawa and Tanaka 1984), drug delivery systems (Hoffman et al 1986, Monji andHoffman 1987), separation process (Bae et al 1987, Freitas andCussler 1987), and immobilization of enzymes (Monji andHoffman 1987, Champ et al 2001).…”

Section: Smart Polymersmentioning

confidence: 99%

Polyacrylamide-based polyampholytes and their applications

Rabiee¹,

Ershad‐Langroudi²,

Jamshidi³

2014

Reviews in Chemical Engineering

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Polyampholytes are charged macromolecules bearing both anionic and cationic groups along the polymer backbone. Polyampholytes can be synthesized by classic and controlled free radical polymerization, anionic polymerization, and group transfer polymerization (GTP). The aqueous solution behavior of polyampholytes is dictated by columbic interactions between the basic and acidic residues. Polyampholytes show both polyelectrolyte and anti-polyelectrolyte behavior in aqueous media. Factors such as charge density, charge asymmetry (i.e., degree of charge balance), charge spacing and distribution, substrate surface charge, structural conformation, and solution ionic strength are critical parameters. Polyampholytes are interesting for numerous reasons and are used for many technology processes such as water treatment, enhanced oil recovery (EOR), sludge dewatering, papermaking, pigment retention, mineral processing, and flocculation. In the present study, the main structural features, behaviors, mechanisms of interaction, and recent field applications of polyacrylamide (PAM)-based polyampholytes are reviewed.

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A novel multi-responsive polyampholyte composite hydrogel with excellent mechanical strength and rapid shrinking rate

Cited by 54 publications

References 46 publications

Facile fabrication of chitosan/poly(vinyl amine) composite beads with enhanced sorption of Cu2+. Equilibrium, kinetics, and thermodynamics

Facile fabrication of chitosan/poly(vinyl amine) composite beads with enhanced sorption of Cu2+. Equilibrium, kinetics, and thermodynamics

Nano-structured smart hydrogels with rapid response and high elasticity

Polyacrylamide-based polyampholytes and their applications

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