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2007-1-25 · Abstract:Carbon dioxide was absorbed into aqueous polyacrylamide (PAM) solution containing monoethan-olamine (MEA) in a flat-stirred vessel to investigate the effect of the non-Newtonian rheological behavior of PAM on the rate of chemical absorption of CO2, where the reaction between CO2 and MEA was assumed to be a first-order reaction with respect to the …
Get Price2003-2-20 · High-molecular-weight polymers playa major role in water treatment,1 floc-culation of colloidal suspensions,2,3 and mobility control in micellar-polymer flooding technology.4,5 These applications have been the subject of recent re-views.6-8 Polyacrylamide and its copolymers hold special importance because of their use in all of these areas.
Get PriceColloidal and chemical properties of poly-meric complexes based on polyacrylamide and polyvinyl alcohol have been investigated. Several factors affecting water absorption by polymeric complexes have been studied: concentration of initial aqueous polymer solutions; components ratio in the mixture; temperature and duration; sorbed aqueous solutions properties (pH; kind of ions).
Get Price2019-8-26 · background absorption due to H2O and PAAm was removed in two steps. The majority of the background, contributed by H2O, was subtracted using the spectrum of pure H2O as the first step. Some residual absorption blue of the hydroxyl (O-D) stretch remained from the PAAm fibers.
Get PriceDifferential permeation and absorption of water vapor in polyacrylamide film Akira Kishimoto The Composite Research and Development Center, Toyo Seikan and Toyo Kohan Companies, Hodogaya, Yokohama, Japan
Get Price1998-6-1 · Partially hydrolyzed polyacrylamide-poly(1-vinyl-2-pyrrolidone) copolymer was synthesized by γ-irradiation through the control of dose rate. Conversion, degree of polyacrylamide hydrolysis, and water absorption of the polymers are reported.
Get Price2018-9-7 · High molecular weight (10 6 –3 × 10 7 Da) polyacrylamide (PAM) is commonly used as a flocculant in water and wastewater treatment, as a soil conditioner, and as …
Get Price2020-11-1 · Polyacrylamide can block pores and occupy adsorption sites in the shale. • Hydrolysis of polyacrylamide facilitates the dissolution of shale minerals. • Polyacrylamide increases the salinity of flowback and produced water.
Get Price2018-2-1 · The absorption coefficient of PAM solution decreases with the increasing temperature in the wavenumber range of 2400–2700 cm −1. The range of absorption coefficient of PAM solution is 15.90–31.11. The temperature has a great influence on the optical constants of PAM solution.
Get Price2021-4-1 · Among the natural and synthetic flocculants, polyacrylamide (PAM) and its derivatives have been extensively studied and are effective to enhance the dewatering of clay suspensions. Besra et al. (2003) reported that cationic PAM was able to improve the settling rate of kaolin suspension by more than 10 fold.
Get Price2003-2-20 · treatment. Equilibrium adsorption of the polymers on the sodium kaolinite was made as a function of pol~'rner concentration, solution pH, ionic strength, and temperature. INTRODUCTION High-molecular-weight polymers playa major role in water treatment,1 floc-culation of colloidal suspensions,2,3 and mobility control in micellar-polymer
Get Price1998-10-28 · The absorption coefficient of ultrasound and shear viscosity in binary solutions of polyacrylamide with water were studied as a function of concentration and temperature. In addition, the absorption coefficient was measured as a function of frequency. The value of α/f2 increased by twofold, at 3% concentration and 20 °C, from the water value while the shear viscosity increased …
Get PriceThe water absorption of hydrogels as a function of 20–80 nm. Based on the literature, this kind of porosity c-ray total dose is shown in Fig. 5. The water absorption in this structure is rare. Usually for samples prepared under increased with total dose up to around 10 kGy, and above optimum thermal conditions, the porosity is much lower that ...
Get PriceChain entanglements in the polymer–keratin network may be responsible for some reduction of water content. The presence of polyacrylonitrile in wool reduced the water content at high humidities to less than that of wool alone, indicating that “volume exclusion” of water by the polymers is also a contributing factor.
Get Price2014-10-17 · Absorption spectra of bR in suspensions of purple membrane and in polymeric films have been widely studied as a function of different variables such as pH, temperature, environment, etc –. Asymmetrical Gaussian or Lorentzian bands are found, and analyzed by different phenomenological mathematical expressions [19] – [22] .
Get Price2016-4-4 · The grafting percentage (GP) of polyacrylamide increases with the feed ratios of [AM]/[OH] and [Ce]/[OH], reaction temperature, and time. Furthermore, the GP can reach up to 160%. Pristine, alkalized, grafted, and hydrolyzed luffa sponges show rapid absorption kinetics, and the pseudo second-order rate equation is applied to describe their ...
Get PriceAQUASORB is a water retainer that, when incorporated into a soil or a substrate, absorbs and retains largequantities of water and nutrients. Unlike most products that become hydrated, AQUASORB has the propertyof easily releasing the absorbed water and nutrients, thereby allowing the plant to have water and nutrientsavailable at will as a function of the absorption – release …
Get Price1984-10-1 · Effect of soluble salts on water absorption by gel‐forming soil conditioners Effect of soluble salts on water absorption by gel‐forming soil conditioners Johnson, Michael S. 1984-10-01 00:00:00 Department of Botany, University of Liverpool, P.O. Box 147, Liverpool L69 3BX (Manuscript received 20 March 1984) The use of gel-forming synthetic polymers as aids to water …
Get Price1998-10-28 · The absorption coefficient of ultrasound and shear viscosity in binary solutions of polyacrylamide with water were studied as a function of concentration and temperature. In addition, the absorption coefficient was measured as a function of frequency. The value of α/f2 increased by twofold, at 3% concentration and 20 °C, from the water value while the shear viscosity increased …
Get Price2018-7-9 · @article{osti_1485138, title = {Water Dynamics in Polyacrylamide Hydrogels}, author = {Yan, Chang and Kramer, Patrick L. and Yuan, Rongfeng and Fayer, Michael D.}, abstractNote = {Polymeric hydrogels have wide applications including electrophoresis, biocompatible materials, water superadsorbents, and contact lenses. The properties of hydrogels involve the poorly …
Get Price2016-3-2 · The research objectives were designed to investigate polyacrylamide superabsorbent polymers as internal curing agent to mitigate autogenous shrinkage of well cement. Results show that poly acrylamide superabsorbent polymer hydrolyzes in alkaline circumstance of cement slurry at high temperature, which causes water absorption increase and then has negative effects on …
Get PriceAbstract: The preparation and application of functional hydrogels based on natural polysaccharides have always been a hot research topic. In this study, using acrylamide (AM) monomer, N, N'-methylene bisacrylamide (MBA) as cross-linking agent, potassium persulfate (K 2 S 2 O 8) as initiator, in the presence of natural polysaccharide sodium alginate (SA), the PAM/SA hydrogel …
Get PriceCarbonic anhydrase-facilitated CO2 absorption with polyacrylamide buffering bead capture. International Journal of Greenhouse Gas Control, 2009. Rick Koepsel. Richard Koepsel. Mohammad Ataai. Robert Dilmore. Sheila Hedges. Zhu Liu.
Get Price2004-2-15 · Analyte molecules up to 6 kDa were ionized directly from a vacuum-dried sodium dodecyl sulfate-polyacrylamide gel after electrophoretic separation. Mass spectra were obtained at the wavelength of 2.94 microm, which is consistent with IR absorption by N-H and O-H stretch vibrations of water and other constituents of the gel.
Get PriceChain entanglements in the polymer–keratin network may be responsible for some reduction of water content. The presence of polyacrylonitrile in wool reduced the water content at high humidities to less than that of wool alone, indicating that “volume exclusion” of water by the polymers is also a contributing factor.
Get PriceExperimental ablation velocity as a function of power which is 0.5% of the power absorbed by the rod. density of 3 mm polyacrylamide rods having an absorption For the lowest absorption coefficient used, 0.9 coefficient of 30 mm-'.
Get Price2015-9-4 · Superabsorbent composites made of chitosan-graft-polyacrylamide and carboxymethylcellulose (CTS-g-PAAm/CMC) were prepared through free radical graft copolymerization of acrylamide (AAm) onto chitosan backbone, and the obtained superabsorbents were also partially hydrolyzed. The formation of the grafted network was evidenced by …
Get Price1998-10-28 · The absorption coefficient of ultrasound and shear viscosity in binary solutions of polyacrylamide with water were studied as a function of concentration and temperature. In addition, the absorption coefficient was measured as a function of frequency. The value of α/f2 increased by twofold, at 3% concentration and 20 °C, from the water value while the shear viscosity increased …
Get PriceWool–polymer systems: Effect of vinyl polymers on water absorption Wool–polymer systems: Effect of vinyl polymers on water absorption Leeder, J. D.; Pratt, A. J.; Watt, I. C. 1967-09-01 00:00:00 Synopsis Acrylamide, acrylic acid, and acrylonitrile have been polymerized in situ within wool fibers and the water-absorption properties of the resultant wool-polymer systems compared with those ...
Get PriceFurthermore, the water-absorption capacity of the synthesized dual-encapsulated polyacrylamide in normal and saline conditions were tested. A cement core impregnated with 16% of dosage of dual-encapsulated polyacrylamide possesses an effective self-healing capability during the water …
Get Price2020-6-29 · polyacrylamide possesses an effective self-healing capability during the water-flow test. Moreover, the maximum linear expansion of the cement core was observed to be 26%. Thus, the impregnation of dual-encapsulated polyacrylamide in cement slurry can exhibit a superior self-healing behavior upon water absorption in an oil well.
Get Price2016-4-4 · The grafting percentage (GP) of polyacrylamide increases with the feed ratios of [AM]/[OH] and [Ce]/[OH], reaction temperature, and time. Furthermore, the GP can reach up to 160%. Pristine, alkalized, grafted, and hydrolyzed luffa sponges show rapid absorption kinetics, and the pseudo second-order rate equation is applied to describe their ...
Get Price2001-1-3 · Polymer Bulletin 41, 363–370 (1998) Polymer Bulletin Springer-Verlag 1998 Heterogeneities in polyacrylamide gels immersed in acetone-water mixtures Oguz Okay1,2, Ufuk Akkan3 1 Department of Chemistry, Istanbul Technical University, TR-80626 Maslak, Istanbul, Turkey 2 TUBITAK Marmara Research Center, P.O. Box 21, TR-41470 Gebze, Kocaeli, Turkey 3 …
Get PriceIn this work, different contents of three-dimensional network polyacrylamide hydrogels were introduced into OPBI (OPBI-AM) membranes via a unique design to simultaneously absorb phosphoric acid and water. Due to their strong phosphoric acid and water absorption abilities, the OPBI-AM membranes were highly conductive over a wide temperature ...
Get Price2019-4-24 · The CaFe 2 O 4 microspheres and polyacrylamide decorated CaFe 2 O 4 microspheres synthesized by a novel sol gel method were applied to study the optical, magnetic properties and photocatalytic activity for photocatalytic degradation of the rhodamine B dye. The polyacrylamide decorated CaFe 2 O 4 microspheres can be successfully prepared by a simple polymerization …
Get PriceCationic Polyacrylamide Properties: Cationic polymer flocculant is a kind of water soluble linear polymer compound, Molecular weight between 8-12 million, its strong positive active group has excellent flocculation.It can be dissolved in methanol, ethanol.Not soluble in organic solvent such as acetone, ester.This product is non-toxic, colorless, tasteless, easy absorption of moisture.It is ...
Get Price2019-8-26 · S1 Water Dynamics in Polyacrylamide Hydrogels Chang Yan†‡, Patrick L. Kramer†, Rongfeng Yuan and Michael D. Fayer* Department of Chemistry Stanford University, Stanford, CA 94305 †C.Y. and P.L.K. contributed equally to this work ‡Current address: Department of Chemistry, University of California, Berkeley, CA 94720 *Corresponding Author.
Get Price2019-7-10 · S1 Water Dynamics in Polyacrylamide Hydrogels Chang Yan †‡, Patrick L. Kramer , Rongfeng Yuan and Michael D. Fayer* Department of Chemistry Stanford University, Stanford, CA 94305 †C.Y. and P.L.K. contributed equally to this work ‡Current address: Department of Chemistry, University of California, Berkeley, CA 94720 *Corresponding Author.
Get Price2020-11-8 · Polyacrylamide uses, In the food processing and sugar industry, PAM can be used for the purification of various meat, fruit and vegetable washing water and the clarification of fruit wine and beer. PAM is used as a flocculant and modified with modified starch to increase the amount of water …
Get PriceWool–polymer systems: Effect of vinyl polymers on water absorption Wool–polymer systems: Effect of vinyl polymers on water absorption Leeder, J. D.; Pratt, A. J.; Watt, I. C. 1967-09-01 00:00:00 Synopsis Acrylamide, acrylic acid, and acrylonitrile have been polymerized in situ within wool fibers and the water-absorption properties of the resultant wool-polymer systems compared with those ...
Get Price2015-4-11 · China's oil is widely used in water flooding, the water cut has reached 90%, of which there are a lot of oilfield water has reached more than 98%. At present, using polyacrylamide as the representative of the water soluble polymer is the use of domestic and foreign water plugging material, the most extensive and most effective.
Get PricePolyacrylamide is insoluble in benzene, toluene, xylene, gasoline, kerosene, diesel fuel, but soluble in water. Polyacrylamide can react with alkaline with partial hydrolysis of polyacrylamide. It will have imidization reaction in strongly acidic (pH≤2.5) which will reduce its solubility in water. It can be cross-linked by the
Get PricePolyacrylamide is an important water-soluble polymer, and has valuable properties such as flocculability, densification, shearing, drag reduction, and dispersibility. These properties have various emphasis depending on different derivative ions.
Get Price2019-7-31 · A water soluble branched cationic polyacrylamide (BCPAM) was synthesized using solution polymerization. e polymerization was initiated using potassium diperiodatocuprate, K 5 [Cu(HIO 6)2](Cu(III)), initiating the self-condensing vinyl copolymerization of acrylamide and acryloxyethyltrimethyl ammonium chloride (DAC) monomer.
Get Price2019-7-10 · S1 Water Dynamics in Polyacrylamide Hydrogels Chang Yan †‡, Patrick L. Kramer , Rongfeng Yuan and Michael D. Fayer* Department of Chemistry Stanford University, Stanford, CA 94305 †C.Y. and P.L.K. contributed equally to this work ‡Current address: Department of Chemistry, University of California, Berkeley, CA 94720 *Corresponding Author.
Get Price2020-11-8 · Polyacrylamide uses, In the food processing and sugar industry, PAM can be used for the purification of various meat, fruit and vegetable washing water and the clarification of fruit wine and beer. PAM is used as a flocculant and modified with modified starch to increase the amount of water …
Get PriceIn this paper,polyacrylamide (PAM) was synthesized with acrylamide as monomer,N,N’-methylene bisacrylamide as crosslinking agent ,sodium sulfite and ammonium persulfate as initiator by means of aqueous solution polymerization.The factors such as monomer concentration,hydrolysis degree,crossing-linking agent concentration and so on influencing on moisture absorbency were …
Get PriceWool–polymer systems: Effect of vinyl polymers on water absorption Wool–polymer systems: Effect of vinyl polymers on water absorption Leeder, J. D.; Pratt, A. J.; Watt, I. C. 1967-09-01 00:00:00 Synopsis Acrylamide, acrylic acid, and acrylonitrile have been polymerized in situ within wool fibers and the water-absorption properties of the resultant wool-polymer systems compared with those ...
Get Price2015-4-11 · China's oil is widely used in water flooding, the water cut has reached 90%, of which there are a lot of oilfield water has reached more than 98%. At present, using polyacrylamide as the representative of the water soluble polymer is the use of domestic and foreign water plugging material, the most extensive and most effective.
Get Price2021-7-12 · Amphoteric polyacrylamide (AmPAM) is a linear water-soluble polymer that has been applied in papermaking as an agent for flocculation, retention, filtration, and dry-strength improvement. However, AmPAM with different ranges of molecular weight (MW) have different properties in these processes.
Get PricePolyacrylamide-Zibo Zhangdian Oriental Chemical Co., Ltd. -Polyacrylamide is an important water-soluble polymer, and has valuable properties such as flocculability, densification, shearing, drag reduction, and dispersibility. Polyacrylamide is an important water ...
Get Price2012-1-8 · water of different temperatures (10°C, 20°C, 30°C, 40°C, 50°C), in a NaCl solution (concentration 0.1g/l, 0.9 g/l, 5 g/l and 10 g/l) and in water with a modified pH (5, 7, 9). Another measure was aimed at monitoring changes in the structure of the textile samples soaked in water at a temperature of 20°C with subsequent drying, which was
Get Price2019-7-31 · A water soluble branched cationic polyacrylamide (BCPAM) was synthesized using solution polymerization. e polymerization was initiated using potassium diperiodatocuprate, K 5 [Cu(HIO 6)2](Cu(III)), initiating the self-condensing vinyl copolymerization of acrylamide and acryloxyethyltrimethyl ammonium chloride (DAC) monomer.
Get Price2021-3-18 · Polyacrylamide (PAM) can regulate soil water, but it is rarely used when remediating tailings matrix. ... An exponential function equation best described the relationship between saturated hydraulic ... During the process, the loss of PAM or decrease in water absorption capacity may increase the saturated hydraulic conductivity. The effect of ...
Get Price2010-11-20 · cross-linked polyacrylamide hydrogels (XPAM), which are similarly used soil amendments (Johnson and Veltkamp, 1985). Salem et al. (1991) reported that )(PAM absorbed 80 to 300 L water kg-1 poly-mer and water absorption increased with increasing water sodium adsorption ratio (SAR) and decreased with increasing total soluble salts.
Get Price2017-8-11 · As shown in Fig. S3, the equilibrium absorption capacities are decreased from 1008.65 to 298.64 mg g −1 for NR, 393.25 to 168.82 mg g −1 …
Get Price2001-1-3 · Polymer Bulletin 41, 363–370 (1998) Polymer Bulletin Springer-Verlag 1998 Heterogeneities in polyacrylamide gels immersed in acetone-water mixtures Oguz Okay1,2, Ufuk Akkan3 1 Department of Chemistry, Istanbul Technical University, TR-80626 Maslak, Istanbul, Turkey 2 TUBITAK Marmara Research Center, P.O. Box 21, TR-41470 Gebze, Kocaeli, Turkey 3 …
Get PriceThe best water absorption performance is 268.78 g/g at 60˚C, in 8% NaCl, the water absorption properties of 0.9% CaCl 2 and composite brine are 21.5 g/g, 12.5 g/g and 24.9 g/g, respectively. The water retention rate is still greater than 30% after 15 days at a high temperature of 160˚C, showing good water retention and resistance temperature.
Get Price2021-7-13 · Polyacrylamide is a long chain of acrylamide molecules that is available in one of three forms: white solid (beads or powder), aqueous solution, and inverse emulsion (in water droplets coated with surfactant and suspended in mineral oil). Acrylamide forms in food, such as french fries, when it is cooked at high temperatures.
Get Price1) Nontoxic, Safety and Environment friendly: non-toxic and tasteless, no pollution to the plants, the soil, the groundwater, the flowers, the fruit trees, the reforestation, the soilless cultivation of plants refrigerated transportation and other field crops. 2) Water Saving. 3) Improve the soil structure. 4) Long Validity.
5) High absorbing speed.
6) High utilization rate of ...
Hydrogels have been one of the greatest interests to biomaterial scientists since the pioneering work of Wichterle and Lim in 1960 on cross-linked HEMA (hydroxyethyl methacrylate) hydrogels, which has led to the development of materials with excellent water absorption, high water retention, good biocompatibility, biodegradability, limited or minimal toxicity, and simplified synthesis …
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