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Use of soil amendments, including anionic polyacrylamide (PAM), is one of many options for protecting soil resources. Polyacrylamide has been the focus of a substantial amount of research in the
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Blufloc Polyacrylamide (PAM) / Polyelectrolyte is water soluble polymer with Anionic, Cationic and Nonionic types. The range of molecular weight is different, Anionic is from 5-22 million, Cationic is from 5-12 million and Nonionic is from 5-12 million, with a charge density ranging from 0-60%.
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Polyacrylamide degradation and its implications
Free radical induced chain scission has been shown to reduce the MW of PAM from 10 7 to 10 5 Da within 24 h upon exposure to iron-bearing shale (1.5 mg/L Fe 2+) at 80 °C. 42 Incubation of 0.6%
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Temperature Influence of Nonionic Polyethylene Oxide
Nonionic polyethylene oxide (PEO) and anionic polyacrylamide (PAM) flocculation of kaolinite dispersions has been investigated at pH 7.5 in the temperature range 20-60 degrees C.
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(PDF) Polyacrylamide: A Review of the Use, Effectiveness,
Polyacrylamide (PAM) has been demonstrated to greatly reduce erosion in furrow irrigation, but much less is known about its effectiveness on the much steeper slopes typical of construction sites.
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Removal of Heavy Metal Water Pollutants (Co2+ and Ni2+) Using
Nanocomposites composed of polyacrylamide and nanoclay were synthesized via free-radical cross-linking polymerization and used to adsorb Co 2+ and Ni 2+ ions from water. The polyacrylamide (PAM)/sodium montmorillonite (Na-MMT) nanocomposites were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy to confirm the interaction between
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Hydrogen bonding seems to govern nonionic polyacrylamide adsorption onto surfaces, while electrostatic interactions and H-bonds are expected for anionic polyacrylamide adsorption. The PAM adsorption level did not change on sand in the presence of an aluminate solution at basic pH, even after one month and the precipitation of the new
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Polyacrylamide (IUPAC poly(2-propenamide) or poly(1-carbamoylethylene), abbreviated as PAM) is a polymer (-CH2CHCONH2-) formed from acrylamide subunits. It can be synthesized as a simple linear-chain structure or cross-linked, typically using N,N'-methylenebisacrylamide. In the cross-linked form, th
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Temperature influence of nonionic polyethylene oxide
Nonionic polyethylene oxide (PEO) and anionic polyacrylamide (PAM) flocculation of kaolinite dispersions has been investigated at pH 7.5 in the temperature range 20–60 °C. The surface chemistry (zeta potential), particle interactions (shear yield stress), and dewatering behavior were also examined.
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(PDF) Polyacrylamide degradation and its implications
Abstract High molecular weight (106–3 × 107 Da) polyacrylamide (PAM) is commonly used as a flocculant in water and wastewater treatment, as a soil conditioner, and as a viscosity modifier and
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Transfer and degradation of polyacrylamide-based flocculants
The aim of this review was to summarize information and scientific data from the literature dedicated to the fate of polyacrylamide (PAM)-based flocculants in hydrosystems. Flocculants, usually composed of PAMs, are widely used in several industrial fields, particularly in minerals extraction, to enhance solid/liquid separation in water containing suspended matter. These polymers can contain
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Preparation and characterization of graft copolymers
The unreacted PEI was then washed with fresh acetone. For the PAM copolymer samples, the converted PAM-co-AA polymers (i.e., polyacrylamide-co-acid chloride, PAM-co-AC) were dissolved in the solvent of FAM. The polymer concentrations are 2.5 wt.% for PAM-co-AC-1.5 and 10 wt.% PAM-co-AC-10, respectively.
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Molecules | Free Full-Text | Preparation of Dispersed
Nonionic polyacrylamide (PAM) with degree of hydrolysis 3.31% and average molecular weight of 9,650,000 g/mol was provided by Yuguang Co. Ltd., Dongying, China. The cross-linker of phenolic resin was purchased from Fanghua Co. Ltd., Dongying, China. The salinity of brine used in all experiments was 400 mg/L.
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(PDF) Simultaneous thermal analysis of cationic, nonionic
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Nonionic polyethylene oxide (PEO) and anionic polyacrylamide (PAM) flocculation of kaolinite dispersions has been investigated at pH 7.5 in the temperature range 20-60 degrees C.
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Synthesis and characterization of high molecular weight
The size of the prepared microemulsion droplets and latex particles was measured by the DLS as shown in Fig. 6 for the polyacrylamide (PAM), Poly(AM-co-OSA-eo22Ac) (PAM-Ia) and Poly(AM-co-O-OS-eo22Ac) (PAM-IIIa) as representative samples.
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Adsorption of nonionic polyacrylamide on sodium
Adsorption of Nonionic Polyacrylamide on Sodium Montmorillonite: Relation between Adsorption, ~" Potential, Turbidity, Enthalpy of Adsorption Data and laC-NMR in Aqueous Solution J. Y. BOTTERO, M. BRUANT, AND J. M. CASES Centre de Recherche sur la Valorisation des Minerais de I'ENSG et U.A. 235 (CNRS), B.P. 40, 54501 Vandoeuvre COdex, France D. CANET Laboratoire de Mdthodologie RMN, UniversitO
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Synthesis and Characterization of Acrylamide-Based Anionic
The copolymer of acrylamide (AM) and 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS) was synthesized through radical solution polymerization by potassium persulfate as initiator. By changing the AMPS feed ratio from 10 to 70%, and keeping other reaction conditions constant, different copolymers were synthesized. The techniques of Fourier transform infrared (FTIR) and nuclear magnetic
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The samples were mixed at room temperature (21 ± 2 °C), 60 °C, and 85 °C, and then dried in air. Samples to investigate effect of drying temperature (post mixing stage) were prepared at clay content of 0.01, pH 11, and clay-to-polymer volume ratio of 12.5. The samples were then dried at 110 °C and room temperature.
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A straightforward method to prepare nonionic polymer (polyacrylamide, PAM) cross-linked chitosan hydrogel has been developed. The chitosan-polyacrylamide (CS-PAM) hydrogel could be quickly
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Dilute solution behaviour of progressively hydrolyzed
For nonionic polyacrylamide, adsorption is independent of NaCl content and pH (between pH 3 and 9) and is shown to take place on both basal and lateral faces. The adsorption density on lateral
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Characterization of clay rock samples of a borax ore
Sabah and Yesilkaya studied the settling behavior of Kırka borax concentrator tailings, testing one non-ionic and two anionic PAM-based flocculants, both in the presence and absence of coagulants (aluminum sulfate and ferric chloride) at pH 9, the natural pH of the waste water samples taken from the plant. The anionic flocculants performed
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Furthermore, samples prepared with polymer and PEI concentrations below 1 wt %, natural bentonite, and PEI with molecular weight of 70,000 kg/kmol and pH of 11: (i) presented good injectivity and propagation parameters (pseudoplastic behavior and viscosity ~25 mPa·s); (ii) showed suitable gelation times for near wellbore (~5 h) or far wellbore
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Polyacrylamide degradation and its implications
Free radical induced chain scission has been shown to reduce the MW of PAM from 10 7 to 10 5 Da within 24 h upon exposure to iron-bearing shale (1.5 mg/L Fe 2+) at 80 °C. 42 Incubation of 0.6%
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Lee and Somasundaran (1989) studied the adsorption of a nonionic polyacrylamide (PAM, 0.7 million Daltons) on oxide minerals (Fe 2 O 3 , Cr 2 O 3 , Al 2 O 3 , TiO 2 , SnO 2 , and SiO 2 ) through
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(PDF) Polyacrylamide degradation and its implications
Abstract High molecular weight (106–3 × 107 Da) polyacrylamide (PAM) is commonly used as a flocculant in water and wastewater treatment, as a soil conditioner, and as a viscosity modifier and
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The effects of polyacrylamide (PAM) molecular weights (MWs) on the PAM adsorption capacities and PAM-mediated flocculation of kaolinite suspensions were investigated using a series of nonionic PAMs with different MWs. Adsorption tests using aqueous kaolinite suspensions dosed with a series of PAMs with MWs of 1.5 kg/mol, 10 kg/mol, 0.6–1 Mg/mol, 5–6 Mg/mol, and 18 Mg/mol (referred to as 1
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For samples 3 and 4 (kaolinite-dominant soils), there were essentially no statistical differences in flocculation power for all anionic PAMs with CD ranging from 7% to 30%, except sample 4, for which 30% CD PAM was more effective than 18% CD PAM when PAM concentration was 0.1-1 mg [L.sup.-1].
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These concentrations were fixed for bentonite-polyacrylamide dispersions for each polyacrylamide type to study the effect of introducing electrolytes on flocculation behavior. Table 3 . Optimum PAM doses corresponding to turbidity, zeta potential and floc sizes ( Shaikh et al., 2017a ).
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Blufloc Polyacrylamide (PAM) / Polyelectrolyte is water soluble polymer with Anionic, Cationic and Nonionic types. The range of molecular weight is different, Anionic is from 5-22 million, Cationic is from 5-12 million and Nonionic is from 5-12 million, with a charge density ranging from 0-60%.
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The modified polyacrylamide hydrogels were obtained via a free radical polymerization of PAM-g-GMA without adding any a crosslinker using potassium persulfate (KPS), as initiator, and
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