Superabsorbant hydrogels based on xanthan and poly(vinyl alcohol)

Alupei, Iulian Corneliu; Popa, Marcel; Hamcerencu, Mihaela; Abadie, M. J. M.

doi:10.1016/s0014-3057(02)00106-4

Cited by 82 publications

(41 citation statements)

References 9 publications

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“…To analyze the film behavior during the swelling process, we calculated the mass swelling degree's variation in time as follows [33] Dynamic swelling data were adjusted with a first order Equation 2 [37] : * max (1 )…”

Section: Resultsmentioning

confidence: 99%

Polyurethane/Poly(2-(Diethyl Amino)Ethyl Methacrylate) blend for drug delivery applications

Echeverría¹,

Pardini²,

Debandi

et al. 2015

Polímeros

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SbstractA pH-sensitive blend of polyurethane (PU) and poly(2-(diethyl amino)ethyl methacrylate (PDEA) with good film-forming capacity was prepared from the corresponding aqueous dispersions. The polymer matrix was first characterized by using FTIR, DSC, water vapor transmission and water swelling capacity at different pHs. The drug release profile of films was evaluated using a vertical Franz Cell and theophylline as model drug. The water swelling degree increases from 54 to 180% when the pH of the medium is changed from 6 to 2, demonstrating the pH-responsive behavior of the film. The in-vitro release studies indicate that an anomalous transport mechanism governs the theophylline release.

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Section: Resultsmentioning

confidence: 99%

Polyurethane/Poly(2-(Diethyl Amino)Ethyl Methacrylate) blend for drug delivery applications

Echeverría¹,

Pardini²,

Debandi

et al. 2015

Polímeros

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“…Figure 2 shows the velocity distributions of water flow near the surface of the acrylic resin versus that of the agar, where δ is the height of water flow and u is the velocity of water [14]. Here, τ being the wall shear stress under the no-slip condition and τ' that under the slip condition, the slip ratio α is defined as follows, α ¼ τ′=τ ð5Þ Figure 3 shows the experimental relations between the swelling ratio S and the slip ratio α for the agar-gel and the carrageenan-gel, respectively, where the swelling ratio S is defined as follows [36],…”

Section: Swelling Ratio and Slip Ratio On Hydro-gel Surfacementioning

confidence: 99%

Some remarks on surface conditions of solid body plunging into water with particle method

Yokoyama

Kubota

Kikuchi

et al. 2014

Advanced Modeling and Simulation in Engineering Sciences

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Background: The water splash patterns strongly depend on the surface conditions of the solid object. The present paper discusses the influence of the surface conditions of the solids falling into the water on the formation of the splashes, employing the experimental method with the high speed video camera and the numerical approach by the particle method. Methods: We propose two engineering models for calculating the Navier-Stokes flows to distinguish the different surface conditions of the solids falling into the water. One is to add the attractive or repulsive force between the water and the surfaces of the solids, and the other is to consider the swelling ratio as the slip condition, which causes the different wall shear stresses at the interfaces between the solids and the water. Results: The above models are successfully employed to study the effects of the differences of the surface conditions of the falling objects on the splash formations. Conclusions: We have successfully calculated the splashes caused by the different surface conditions of spheres using the MPS method.

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“…Several processing methods on hydrogels synthesis have been reported, i.e. based on chemical method using crosslinker, physical method using complexing agent, and irradiation methods using gamma ray irradiation or electron beam (Finch, 1973;Bajpai et al, 2001;Ruiz et al, 2002;Jiangi & Lixia, 2002;Alupei et al, 2002;Lim et al, 2002;Kim et al, 2003;W ang et al, 2004). Each method has advantages and disadvantages.…”

Section: Introductionmentioning

confidence: 99%

Properties of Sodium Alginate–Polyvinyl Alcohol Hydrogels Irradiated By Gamma Ray For Wound Dressing Materials

Wikanta¹,

Erizal²

2013

Squalen Bull. Marine Fisheries Postharvest Biotech.

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A copolymer of sodium alginate (SA)-polyvinyl alcohol (PVA) was synthesized by gamma irradiation to make a hydrogel and study on its properties has been carried out. A series of 0.5% -2.0% (w/v) of SA solution and 10% (w/v) of PVA solution were prepared in separate tubes. Each of the SA solution was mixed with PVA solution, then it was irradiated with gamma ray at the doses of 30 kGy, 40 kGy, and 50 kGy (dose rate of 10 kGy/hour), respectively. The properties of hydrogels were evaluated comprising of the physical performance, gel fraction, swelling ratio, water evaporation, and pH. The results showed that increase of irradiation dose can increase the gel fraction, but increase of SA concentration can decrease the gel fraction. SA concentration of 1-2% with gamma ray irradiation dose of 30 kGy was a suitable condition to produce a good hydrogel with properties as follow, gel fraction of 75.83%-78.70%, swelling ratio of 69.12-80.14 g/ g, and maximum water evaporated of 54.21-76.41%, the pH value ranged 5.60-5.65. The hydrogels produced are suitable to be used for wound dressing, especially for wet wounds, and can be applied for two days.Keywords: Sodium alginate, polyvinyl alcohol, gamma ray irradiation, hydrogel, wound dressing ABSTRAK Kopolimer sodium alginat (SA) -polivinil alkohol (PVA) telah disintesis menggunakan irradiasi sinar gamma menjadi hidrogel, kemudian dilakukan studi sifat-sifatnya. Disiapkan satu seri larutan SA 0,5%-2,0% (b/v) dan larutan PVA 10% (b/v) dalam tabung-tabung terpisah. Masingmasing larutan SA dicampur dengan larutan PVA, kemudian diirradiasi sinar gamma dengan dosis masing-masing 30 kGy, 40 kGy, dan 50 kGy (laju dosis 10 kGy/jam). Sifat-sifat hidrogel dievaluasi, meliputi penampakan fisik, fraksi gel, rasio swelling, evaporasi air, dan pH. Hasil pengamatan menunjukkan bahwa meningkatnya dosis irradiasi dapat meningkatkan fraksi gel, tetapi meningkatnya konsentrasi SA dapat menurunkan fraksi gel. Dosis irradiasi 30 kGy dan konsentrasi 1-2% SA adalah kondisi yang sesuai untuk menghasilkan hidrogel yang baik dengan sifat-sifat: fraksi gel 75,83%-78,70%, rasio swelling 69,12-80,14 g/g, air yang menguap maksimum 54,21-76,41% dengan nilai pH pada kisaran 5,60-5,65. Hidrogel yang dihasilkan layak digunakan untuk pembalut luka, khususnya untuk luka basah, dan dapat digunakan selama 2 hari pemakaian.Kata Kunci: Sodium alginat, polivinil alkohol, irradiasi sinar gamma, hidrogel, pembalut luka

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Superabsorbant hydrogels based on xanthan and poly(vinyl alcohol)

Cited by 82 publications

References 9 publications

Polyurethane/Poly(2-(Diethyl Amino)Ethyl Methacrylate) blend for drug delivery applications

Polyurethane/Poly(2-(Diethyl Amino)Ethyl Methacrylate) blend for drug delivery applications

Some remarks on surface conditions of solid body plunging into water with particle method

Properties of Sodium Alginate–Polyvinyl Alcohol Hydrogels Irradiated By Gamma Ray For Wound Dressing Materials

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