Superabsorbent polyacrylamide grafted carboxymethyl cellulose pH sensitive hydrogel: I. Preparation and characterization

Eldin, M.S. Mohy; Omer, Ahmed M.; Soliman, Emad A.; Hassan, E. A.

doi:10.1080/19443994.2012.751156

Cited by 42 publications

(13 citation statements)

References 31 publications

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“…It was clear that the basic characteristics of the chitosan polysaccharide structure were retained at 852–1170 cm −1 . The observed characteristics included a broad band at around 3441 cm −1 , in the AmCs spectrum that corresponded to the stretching vibrations of amine and hydroxyl groups [ 33 ]. These bands were shifted to 3446 and 3452 cm −1 in Q-AmCs1 and Q-AmCs2 derivatives.…”

Section: Resultsmentioning

confidence: 99%

Formulation of Quaternized Aminated Chitosan Nanoparticles for Efficient Encapsulation and Slow Release of Curcumin

et al. 2021

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An effective drug nanocarrier was developed on the basis of a quaternized aminated chitosan (Q-AmCs) derivative for the efficient encapsulation and slow release of the curcumin (Cur)-drug. A simple ionic gelation method was conducted to formulate Q-AmCs nanoparticles (NPs), using different ratios of sodium tripolyphosphate (TPP) as an ionic crosslinker. Various characterization tools were employed to investigate the structure, surface morphology, and thermal properties of the formulated nanoparticles. The formulated Q-AmCs NPs displayed a smaller particle size of 162 ± 9.10 nm, and higher surface positive charges, with a maximum potential of +48.3 mV, compared to native aminated chitosan (AmCs) NPs (231 ± 7.14 nm, +32.8 mV). The Cur-drug encapsulation efficiency was greatly improved and reached a maximum value of 94.4 ± 0.91%, compared to 75.0 ± 1.13% for AmCs NPs. Moreover, the in vitro Cur-release profile was investigated under the conditions of simulated gastric fluid [SGF; pH 1.2] and simulated colon fluid [SCF; pH 7.4]. For Q-AmCs NPs, the Cur-release rate was meaningfully decreased, and recorded a cumulative release value of 54.0% at pH 7.4, compared to 73.0% for AmCs NPs. The formulated nanoparticles exhibited acceptable biocompatibility and biodegradability. These findings emphasize that Q-AmCs NPs have an outstanding potential for the delivery and slow release of anticancer drugs.

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Section: Resultsmentioning

confidence: 99%

Formulation of Quaternized Aminated Chitosan Nanoparticles for Efficient Encapsulation and Slow Release of Curcumin

et al. 2021

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“…Higher content of MBA in the composite matrix (BSAPCs) resulted higher G y and G e , due to generation of more crosslinked polyacrylamide chain [poly(AAm)] grafted per unit of NaCMC backbone. Similarly, higher content of AM in BSAPCs resulted increase in G y although composites with AM:NaCMC ratio above 3.0:1 showed low G e which may be due to higher radical formation on AM leading to lowering of viscosity of polymerization medium and increase rate of termination process . Increase amount of borax in BSAPCs resulted higher G y , due to generation of more borate crosslinked point in the cellulosic chain of NaCMC leading to formation of higher amount of net crosslinked polymeric material and lower G e which may be resulted from low availability of grafting sites of NaCMC per unit of AM.…”

Section: Resultsmentioning

confidence: 97%

Viscoelastic properties of borax loaded CMC‐g‐cl‐poly(AAm) hydrogel composites and their boron nutrient release behavior

Sarkar

Singh

Gaur

et al. 2016

J of Applied Polymer Sci

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Borax (Na 2 B 4 O 7 , 10.5% Boron) loaded CMC-g-cl-Poly(AAm) hydrogel composites were prepared by in situ grafting of acrylamide on to sodium carboxymethyl cellulose in the presence of borax by free radical polymerization technique to develop slow boron (B) delivery device. The composition, morphology, and mechanical properties of synthesized composites were studied by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, texture analyser, and dynamic shear rheometer. Characterization revealed formation of borate ion (BO 32 3 ) from borax during polymerization reaction leading to extensive crosslinking of cellulosic chains and generation of mechanically strong composite hydrogels. Dynamic release of BO 32 3 from the synthesized composites hydrogels followed Fickian diffusion mechanism and composites with high mechanical strength resulted in slow release of B.

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“…The graft copolymers have also been found to have significant improvements in mechanical properties, thermal stability, shear stability, and enhanced modulus for the synergism between the components because of the attachment of flexible synthetic polymers onto the rigid polysaccharide backbones. [19] Yongqiang et al [20] used starch-graft-polyacrylamide/N,N′-methylenebisacrylamide gel for a three-dimensional physical model of a horizontal well as a water shutoff agent. They showed that the decline of water cut in the field experiment is more explicit than in the lab experiment and the water shutoff operation has a better effect when applying to the field than to the lab.…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, graft copolymers of natural polysaccharides and synthetic polymers such as polyacrylamide have attracted much attention as advanced polymeric materials. The graft copolymers have also been found to have significant improvements in mechanical properties, thermal stability, shear stability, and enhanced modulus for the synergism between the components because of the attachment of flexible synthetic polymers onto the rigid polysaccharide backbones . Yongqiang et al .…”

Section: Introductionmentioning

confidence: 99%

Study of the polymer concentration and polymer/crosslinker ratio effect on gelation time of a novel grafted polymer gel for water shutoff using a central composite design method

Singh

Mahto

2015

Polym. Adv. Technol.

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In this research article, a hydrogel was prepared by crosslinking of carboxymethyl cellulose-g-polyacrylamide copolymer aqueous solution with chromium(III) acetate for the purpose of a water shutoff job in the oil reservoir. The experiments were conducted to investigate the main effects of copolymer concentration and crosslinker/copolymer ratio on gelation time of the hydrogel system. Then the effects of these two factors and their interactions on the gelation time were determined by using a central composite design (CCD) of the response surface method. CCD was used to generate the quadratic mathematical model for the gelation time response as a function of copolymer concentration, crosslinker/copolymer ratio, and their interaction. Furthermore, the analysis of variance (ANOVA) was used to evaluate the quality of the quadratic model. The ANOVA result of the developed model showed that the model was highly significant. The result also showed that the crosslinker/polymer ratio had more effects on the gelation time than did the polymer concentration and their interaction. A response surface method provides an optimum gel formulation. Core flooding experiments reveal that a significant permeability reduction on the sand pack cores can be achieved at reservoir conditions, when it is treated with an optimum gel formulation. Hence, this gel system may be suitable in the water shutoff job required for enhanced oil recovery from the oil fields. Copyright

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Superabsorbent polyacrylamide grafted carboxymethyl cellulose pH sensitive hydrogel: I. Preparation and characterization

Cited by 42 publications

References 31 publications

Formulation of Quaternized Aminated Chitosan Nanoparticles for Efficient Encapsulation and Slow Release of Curcumin

Formulation of Quaternized Aminated Chitosan Nanoparticles for Efficient Encapsulation and Slow Release of Curcumin

Viscoelastic properties of borax loaded CMC‐g‐cl‐poly(AAm) hydrogel composites and their boron nutrient release behavior

Study of the polymer concentration and polymer/crosslinker ratio effect on gelation time of a novel grafted polymer gel for water shutoff using a central composite design method

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