Optimization of synthetic conditions CMC-g-poly (acrylic acid)/Celite composite superabsorbent by Taguchi method and determination of its absorbency under load

Pourjavadi, Ali; Amini‐Fazl, Mohammad Sadegh; Ayyari, M.

doi:10.3144/expresspolymlett.2007.69

Cited by 41 publications

(22 citation statements)

References 22 publications

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“…Figure shows the dynamic swelling behavior of hydrogels having a pH‐dependency date with different AA concentrations (15.02, 20.40, and 27.44%) in solution as a function of the pH of the swelling medium and with the crosslinker concentrations kept constant at 0.5% AA. The dynamic and equilibrium swelling coefficients did not increase considerably at low pH because the carboxyl groups remained associated and formed hydrogen bonding with PVA chains, but at higher pHs, that is, 5.5, 6.5, and 7.5, there was a significant increase in the swelling because of the availability of a large number of carboxylate ions …”

Section: Discussionmentioning

confidence: 95%

Synthesis and characterization of cetirizine‐containing, pH‐sensitive acrylic acid/poly(vinyl alcohol) hydrogels

Ranjha

Hanif

Naz

et al. 2016

J of Applied Polymer Sci

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In this study, interpenetrated acrylic acid (AA)/poly(vinyl alcohol) (PVA) hydrogels were prepared by free-radical polymerization with N,N-methylene bisacrylamide (MBAAm) as a crosslinker. The basic structural parameters, such as the molecular weight between crosslinks, volume interaction parameter, number of crosslinks, Flory-Huggins solvent interaction parameter, and diffusion coefficient, were calculated. Cetirizine dihydrochloride was loaded as a model drug in selected samples. The prepared hydrogels were evaluated for swelling, sol-gel fraction, and porosity. The swelling of the AA/PVA hydrogels was found to be directly proportional to the pH, that is, 1.2-7.5, depending on composition. The percentage of cetirizine hydrochloride was found to be directly proportional to the buffer pH and was at its maximum at pH 7.5, that is, 90-95%, and its lowest at pH 1.2, that is, 20-30%. The gel fraction increased with increasing concentration of AA and MBAAm, whereas the porosity showed the same response with AA, but an inverse relationship was observed with MBAAm. The drug-release data were fitted into various kinetics models, including the zero-order, first-order, Higuchi, and Peppas models, which showed non-Fickian diffusion. The prepared hydrogels were characterized by Fourier transform infrared spectroscopy and scanning electron microscopy, and no interaction was found among the polymer ratio and the drug.

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Section: Discussionmentioning

confidence: 95%

Synthesis and characterization of cetirizine‐containing, pH‐sensitive acrylic acid/poly(vinyl alcohol) hydrogels

Ranjha

Hanif

Naz

et al. 2016

J of Applied Polymer Sci

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“…The swelling capacity of a hydrogel under a load is a measure of its mechanical strength and stability 40. In many applications, a hydrogel is applied under a specific pressure or load 41. Therefore, the swelling behaviors of the hydrogel samples belonging to the Gl–C series were studied under a load (1.5 KPa).…”

Section: Resultsmentioning

confidence: 99%

Hydrogel membranes based on gum tragacanth with tunable structures and properties. II. Comprehensive characterization of the swelling behavior

Kiani

Asempour

2012

J of Applied Polymer Sci

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Hydrogel membranes based on gum tragacanth (GT), with a wide range of crosslinking densities (0.83-23.87 Â 10 À6 mol/cm 3 ) and swelling capacities (120-1580 g/g), were prepared with the aid of heat alone and four crosslinking reagents according to a procedure reported in our previous article. In this article, we report on the comprehensive evaluation of the swelling behavior of the prepared hydrogel membranes. These include the swelling kinetics, swelling behavior in terms of the pH and ionic strength of the swelling media, water absorbency under load (AUL), swelling as a function of sample size, deswelling behavior, and successive swelling and deswelling cycles. The swelling kinetics of the hydrogel membranes with higher crosslinking densities and lower swelling equilibria were closer to those of the case II transport mechanism; this is desirable in the field of drug-delivery systems (DDSs). Furthermore, higher crosslinking densities, and hence stronger structures, of the membranes led to higher AUL values and more stable performances in the successive swelling and deswelling cycles. Moreover, because of the anionic nature of the gum, the prepared GT hydrogels showed pH-and ionic-strengthdependent swelling behavior. All of these results reveal that GT could be a promising material for the preparation of hydrogel membranes for applications in the fields of DDS, tissue engineering, and the separation of small molecules.

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“…It can provide a simple, efficient, and systematic approach to optimizing designs in terms of performance, quality, and cost [12]. Many studies have used this method to optimize the conditions used in syntheses [33,34].…”

Section: Introductionmentioning

confidence: 99%

Optimized synthesis and swelling properties of a pH-sensitive semi-IPN superabsorbent polymer based on sodium alginate-g-poly(acrylic acid-co-acrylamide) and polyvinylpyrrolidone and obtained via microwave irradiation

Tally

Atassi

2015

J Polym Res

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A pH-sensitive superabsorbent hydrogel composite, sodium alginate-g-poly(acrylic acid-co-acrylamide) in the presence of polyvinylpyrrolidone (PVP), was prepared using the semi-interpenetrating polymer network (semi-IPN) technique and microwave irradiation. Potassium peroxodisulfate (KPS) was used as an initiator, N,N,N′,N′-tetramethylene diamine (TEMED) as a reaction accelerator, and N,N′-methylene bisacrylamide (MBA) as a crosslinker. The Taguchi method was employed to optimize the synthetic conditions for the hydrogel based on water absorbency. The Taguchi L 9 (3 4 ) orthogonal array was selected for the experimental design. The mass concentrations of MBA (C MBA ), KPS (C KPS ), and sodium alginate (C NaAlg ) as well as the molar ratio of acrylamide to acrylic acid (R AM/AA ) were chosen as the four factors in the design. Based on an analysis of variance in the test results, the optimal conditions were found to be 0.18 g/L of MBA, 0.60 g/L of KPS, 7.73 g/L of NaAlg, and R AM/AA = 1:1. The maximum water absorbency of the optimized hydrogel was found to be 1551 g/g. The relative thermal stability of the hydrogel in comparison with sodium alginate was proven using thermogravimetric analysis. The prepared hydrogel was characterized by FTIR and scanning electron microscopy (SEM). The influences of environmental parameters such as the pH and the ionic strength of the solution on the water absorbency were also investigated.

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Optimization of synthetic conditions CMC-g-poly (acrylic acid)/Celite composite superabsorbent by Taguchi method and determination of its absorbency under load

Cited by 41 publications

References 22 publications

Synthesis and characterization of cetirizine‐containing, pH‐sensitive acrylic acid/poly(vinyl alcohol) hydrogels

Synthesis and characterization of cetirizine‐containing, pH‐sensitive acrylic acid/poly(vinyl alcohol) hydrogels

Hydrogel membranes based on gum tragacanth with tunable structures and properties. II. Comprehensive characterization of the swelling behavior

Optimized synthesis and swelling properties of a pH-sensitive semi-IPN superabsorbent polymer based on sodium alginate-g-poly(acrylic acid-co-acrylamide) and polyvinylpyrrolidone and obtained via microwave irradiation

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