Water sorption through a semi-interpenetrating polymer network (IPN) with hydrophilic and hydrophobic chains

Bajpai, A. K.; Bajpai, Jaya; Shukla, Sandeep K.

doi:10.1016/s1381-5148(01)00085-2

Cited by 110 publications

(68 citation statements)

References 32 publications

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“…From Table 9, the values of n obtained are Fickian and lie in the range 0.4 < ƒ ≤ 0.5 for the composites at different temperatures, filler content, particle sizes and treatment. This observation had been reported elsewhere in the literature [29,52,53]. Moreover, the values of n did not show any relationship to the amount filler, its treatment and particle size.…”

Section: Transport Mechanismssupporting

confidence: 87%

Organic Solvents Transport Through Alkali-Treated Agro-waste Microfibre Incorporated with Low Density Polyethylene Composites

Obasi¹

2017

AJPST

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Abstract:We report the transport behaviour of low density polyethylene composites containing both untreated and alkalitreated agro-waste microfibre in three aromatic organic solvents (benzene, toluene, and xylene) at 40, 60 and 80°C by the conventional weight-gain method. The effects of fibre content, alkali treatment, and filler particle size on solvent sorption were analysed. Transport parameters such as diffusion coefficient, sorption coefficient, and permeation coefficient have been calculated in terms of microfibre content, particle size, nature of the solvent, and temperature. It was observed that all the systems follow the Fickian mode of transport on increasing temperature. The van't Hoff's relationship was used to determine the thermodynamic parameters and was found that the estimated free energies of sorption were all positive, indicating nonspontaneity of the solubility of micro fibre/LDPE composites. The first order kinetic rate constant and swelling parameters were also evaluated.

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Section: Transport Mechanismssupporting

confidence: 87%

Organic Solvents Transport Through Alkali-Treated Agro-waste Microfibre Incorporated with Low Density Polyethylene Composites

Obasi¹

2017

AJPST

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“…In most published reports on the hydrogel swelling, values of n close to 0.5 or over 0.5 are presented. Only a few papers report values of n<0.5 [25,[43][44][45][46][47].…”

Section: Case III (Or Anomalous Diffusion Non-fickian Diffusion)mentioning

confidence: 99%

pH-responsive hydrogel membranes based on modified chitosan: water transport and kinetics of swelling

2015

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pH-responsive membranes prepared by treating chitosan (Ch) with glutaraldehyde (GA) or with GA and sulfuric acid (SA) were studied. The structure and properties of the membranes were characterized by Fourier transform infrared (FTIR) spectroscopy, wide-angle X-ray diffraction (WAXD), scanning electron microscopy (SEM), atomic force microscopy (AFM), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and elemental analysis. The effect of the cross-linking process both on the dynamic swelling behaviour of the hydrogel membranes and on the mechanism of water transport through those membranes was investigated in buffer solutions of different pH (1.2-9.5). The mechanism of water transport through the hydrogel chitosan membranes was affected by membrane composition and pH of the swelling medium. Non-cross-linked Ch membrane showed a non-Fickian swelling behaviour in the pH range 6.5-9.5. Chitosan membrane cross-linked with GA (Ch/GA) showed less-Fickian or Fickian swelling behaviour in all buffer solutions. In the case of chitosan membrane cross-linked with GA and SA (Ch/GA/SA), at low pH (lower than the pK a of the hydrogel) the water transport was controlled more by polymer relaxation than by penetrant diffusion. The experimental data clearly suggested that the swelling process in all buffer solutions obeyed second-order kinetics. Values of an apparent swelling rate constant for Ch/ GA and Ch/GA/SA membranes were of the same order of magnitude for acidic and neutral swelling media but they increased for alkaline solutions.

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“…Mixed of SA-PVA solution were homogenized in the shaker (Kottermann) at room temperature. Each solution was packed in a polyethylene (PE) plastic sac with the size of 20 cm x 10 cm x 0.5 cm, air tightly closed by using sealing machine, and irradiated with gamma ray (IRKA irradiator) at the dose of 30 kGy; 40 kGy; and 50 kGy (dose rate was 10 kGy/ hour) (Bajpai et al, 2001). Each treatment was prepared in three replicates.…”

Section: Preparation Of Hydrogelsmentioning

confidence: 99%

“…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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Water sorption through a semi-interpenetrating polymer network (IPN) with hydrophilic and hydrophobic chains

Cited by 110 publications

References 32 publications

Organic Solvents Transport Through Alkali-Treated Agro-waste Microfibre Incorporated with Low Density Polyethylene Composites

Organic Solvents Transport Through Alkali-Treated Agro-waste Microfibre Incorporated with Low Density Polyethylene Composites

pH-responsive hydrogel membranes based on modified chitosan: water transport and kinetics of swelling

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

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