Thoms Effect as Influenced by the Concentration and Molecular Parameters of the Cationic Copolymer of Acrylamide

The Thoms effect observed with water-soluble cationic copolymer of acrylamide was studied in relation to the concentration, molecular weight, and molecular weight polydispersity of the polymeric additive, with its composition and composition polydispersity being constant.     

Effect of selective interactions of ionic acrylamide copolymers on flocculation properties with respect to titanium oxide in aqueous salt solutions

The kinetics of unhindered sedimentation of a titanium dioxide suspension (as model dispersed system) was studied, and the effect of the concentration and mode of addition of various formulations based on anionic and cationic acrylamide copolymers on their flocculation properties in aqueous salt (NaCl) solutions was evaluated.     

Sedimentation Kinetics of Bentonitic Clay Suspension as Influenced by pH of the Medium,Chemical Nature and Concentration of Surfactants,and Molecular Properties of Cationic Acrylamide Copolymer Flocculants

The kinetics of flocculation of bentonitic clay suspensions and thickening of the sediments was studied in the modes of free and hindered sedimentation as influenced by pH of the medium, chemical nature and concentration of surfactants, and molecular properties of cationic flocculants, random copolymers of acrylamide with dimethylaminoethyl methacrylate hydrochloride.     

Kinetics of flocculation and thickening of precipitates of bentonitic clay suspension in the presence of acrylamide copolymers in aqueous salt solutions

The kinetics of hindered sedimentation and thickening of the sediments of a real disperse system (bentonitic clay suspension) was studied. The flocculation parameters of acrylamide copolymers in aqueous and aqueous salt solutions were evaluated in relation to the chemical nature and concentration of flocculants and electrolytes.     

Toms Effect as Influenced by the Glass Capillary Length and Diameter

The degree of reduction of the hydraulic resistance was studied as influenced by the concentration of the anionic copolymer of acrylamide, geometric parameters of the contour, and turbulent flow velocity.__________Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 4, 2005, pp. 669–672.Original Russian Text Copyright © 2005 by Chichkanov, Myagchenkov.     

Heterogeneous copolymerization of acrylamide with maleic acid in dioxane

Heterogeneous copolymerization of acrylamide with maleic acid has been investigated. The process was carried out at 70°C in 1,4-dioxane. The polarographic method of analysis was applied. The analysis of the experimental and theoretical composition distribution curves has shown an anomalously large composition polydispersion for the experimental distribution curves. This is attributed to the heterogeneity of the copolymerization process.     

Effect of concentration and composition of anionic copolymers of acrylamide on flocculation characteristics of titanium dioxide suspension (Anatase)

Russian Journal of Applied Chemistry - The kinetics of restricted sedimentation of model disperse system, titanium dioxide suspension of anatase modification, at dosed addition of high-molecular...     

Kinetics of the polymerization of potassium p-styrenesulphonate in various media

The free radical polymerization of potassium p-styrenesulphonate has been investigated at 70° for solutions in dimethyl sulphoxide (DMSO)-water mixtures (1:3 and 3:1) and in DMSO using 2,2′-azobisisobutyronitrile as initiator. The kinetic orders with respect to monomer and initiator increase but the rate of polymerization, the value of $\text{k}{}_{\mathrm{p}}\text{/k}{}^{\mathrm{<mtext>1</mtext><mtext>2</mtext>}}{}_{\mathrm{t}}$ and the average molecular weight of the resulting polymer decrease with increasing DMSO concentration in the DMSO-water mixture. These effects have been attributed to changing of parameters of the electrostatic interactions in the system “macroradical-counterions-anions of monomer” with change of composition of the medium.     

Effect of pH on the Flocculation of Aqueous Ocher Suspension in the Presence of Ionic Copolymers of Acrylamide

The effect of pH on the kinetics of flocculation of an aqueous ocher suspension in the presence of ionic polyacrylamide flocculants was studied and their flocculation properties were compared.     

The influence of chemical inhomogeneity of flocculant (copolymer of acrylamide with sodium acrylate) on the rate of sedimentation of ochre suspension

The sedimentation rate of ochre suspension in the presence of copolymer decreases with increase of ionic strength (μ) and decrease of copolymer concentration. The dependence of the flocculation properties of copolymers for ochre on chemical inhomogeneity of the copolymers is more significant for low values of μ than for large values of μ. The data were explained in terms of the influence of chemical structure and conformational state of macromolecules on the formation of bridges between particles of ochre by means of macromolecules.