Polyacrylamide‐grafted carboxymethyl cellulose: Smart pH‐sensitive hydrogel for protein concentration

Eldin, M.S. Mohy; El-Sherif, Hazem; Soliman, Emad A.; Elzatahry, Ahmed A.; Omer, Ahmed M.

doi:10.1002/app.33283

Cited by 54 publications

(23 citation statements)

References 44 publications

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“…The PAM homopolymer and graft copolymer obtained at the Aam to CG molar ratio of 20:1 and a KPS amount of 0.190 mmol both had an intrinsic viscosity value of 3.5 dL g −1 . High viscosity hinders the movement of free radicals and monomer molecules, resulting in the increase of chain transfer to the monomer molecules . The copolymers CG‐ g ‐PAM‐Control I and CG‐ g ‐PAM‐Control II, obtained by conventional method, presented intrinsic viscosity higher than that of the CG‐ g ‐PAM copolymers prepared with ultrasound energy (Table ).…”

Section: Resultsmentioning

confidence: 99%

Chemical modification of cashew gum with acrylamide using an ultrasound‐assisted method

Klein

Lima

Feira

et al. 2016

J of Applied Polymer Sci

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A flocculant based on cashew gum (CG) grafted with polyacrylamide (PAM) was synthesized using potassium persulfate as the chemical initiator and ultrasound energy. The intrinsic viscosity, hydrodynamic radius, and grafting efficiency of the grafted copolymers (CG-g-PAM) were investigated at different monomer and initiator concentrations. The CG-g-PAM copolymers were evaluated in kaolin suspension and river water by using jar test procedure comparatively to a commercial flocculant (Flonex-9045). Ultrasonication resulted in reduced reaction time and high grafting efficiency. The reaction gel point was reached within 10 min and the grafting efficiency was dependent on the acrylamide concentration. The grafted copolymer CG-g-PAM-15 285 obtained with 0.285 mmol of initiator showed higher hydrodynamic radius, with flocculation efficacy of 96% comparable with the flocculant Flonex-9045.

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Section: Resultsmentioning

confidence: 99%

Chemical modification of cashew gum with acrylamide using an ultrasound‐assisted method

Klein

Lima

Feira

et al. 2016

J of Applied Polymer Sci

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“…To investigate the swelling mechan of AA/CMC, the swelling pseudo‐first order and Schott's swelling pseudo‐second‐order kinetics model were referenced to evaluate the experimental data. The pseudo‐first order can be formulated as :

\lg (Q_{eq} - Q_{t}) = \lg Q_{eq} - \frac{k_{1}}{2.303} t,

where Q t (g/g) is swelling at time t , Q eq is equilibrium swelling (g/g), t is time (min) of swelling, k 1 (min −1 ) is the rate constant of the swelling pseudo‐first order.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, Characterization, and swelling behaviors of acrylic acid/carboxymethyl cellulose superabsorbent hydrogel by glow‐discharge electrolysis plasma

Yang

et al. 2013

Polymer Engineering & Sci

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This article exploits a new approach for synthesis of acrylic acid/carboxymethyl cellulose (AA/CMC) superabsorbent hydrogel in aqueous solution by a simple one-step using glow-discharge electrolysis plasma, in which N,N 0 -methylenebisacrylamide (MBA) was used as a crosslinking agent. The reaction parameters affecting the equilibrium swelling, that is, discharge voltage, discharge time, mass ratio of AA to CMC, content of crosslinker, and degree of neutralization, were systematically optimized to achieve a superabsorbent hydrogel with a maximum equilibrium swelling. The structure, thermal stability, and morphology of AA/CMC superabsorbent hydrogel were characterized by Fourier transform infrared spectroscopy, X-ray diffraction analysis, thermogravimetric analysis, and scanning electron microscopy. The swelling kinetics in distilled water and swelling behaviors in various pH solutions and salts solutions (NaCl, KCl, MgCl 2 , CaCl 2 , AlCl 3 , and FeCl 3 ) were investigated in detail. The effect of six cationic salt solutions on the equilibrium swelling had the following orderIn addition, the pH-reversibility was preliminarily investigated with alternating pH between 6.5 and 2.0. The results showed that the equilibrium swelling of AA/CMC was achieved in 90 min. The hydrogel was responsive to the pH and salts, and was reversible swelling and deswelling behavior.

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“…In our previous research, a double‐network hydrogel cage structure prepared with CMC and HEC could provide surface carboxymethyl groups for immobilizing nanoparticles of TiO 2 . Predictably, the double‐network hydrogel crosslinked by HEC and CMC could also provide many electronegative binding sites, which have the ability to assemble some electropositive substances and exhibit additional functionalities . With these advantages, the double‐network hydrogels prepared with CMC and HEC have accelerated the development of hydrogels …”

Section: Introductionmentioning

confidence: 99%

Preparation of cellulosic drug‐loaded hydrogel beads through electrostatic and host–guest interactions

Wang

2018

J of Applied Polymer Sci

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Cyclodextrin‐grafted cellulosic hydrogel beads (CD+@HEC‐CMC‐gel) were prepared through electrostatic and host–guest interactions. β‐Cyclodextrin (CD+) modified with quaternary ammonium groups was used as the electropositive binding site, and carboxymethyl cellulose (CMC) in a double‐network hydrogel structure was used as the electronegative binding site. The double‐network structure was obtained by controlling the crosslinking of CMC and hydroxyethyl cellulose (HEC) in the presence of epichlorohydrin. The electrostatic interaction was used to graft CD+ onto the electronegative double‐network structure. Scanning electron microscopy indicated an obvious change in the cellulosic double network after grafting of CD+. The grafting content of CD+ in CD@HEC‐CMC‐gel is determined as 93.10 ± 0.74% by the photometric titration method. In order to evaluate the assembling and releasing ability, ibuprofen (IBU) was selected to be encapsulated in CD+@HEC‐CMC‐gel by host–guest interaction. In addition, the release of IBU by the hydrogel beads was explained by several kinetic models. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46593.

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Polyacrylamide‐grafted carboxymethyl cellulose: Smart pH‐sensitive hydrogel for protein concentration

Cited by 54 publications

References 44 publications

Chemical modification of cashew gum with acrylamide using an ultrasound‐assisted method

Chemical modification of cashew gum with acrylamide using an ultrasound‐assisted method

Synthesis, Characterization, and swelling behaviors of acrylic acid/carboxymethyl cellulose superabsorbent hydrogel by glow‐discharge electrolysis plasma

Preparation of cellulosic drug‐loaded hydrogel beads through electrostatic and host–guest interactions

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