Acrylamide formation between

The kinetics of the oxidation of isopropylamine by diperiodatocuprate(III) complex ion have been studied and the results are consistent with a mechanism in which dissociation of one of the periodate ligands is followed by an adduct formation between [Cu(HIOg)] and isopropylamine. Polymerization of acrylamide indicated the participation of free radicals The kinetics of the oxidation of several diols by diperiodatocuprate(III) (DPC) in aqueous alkaline media have been studied. ... 

Acrylamide, 2-methyl-5-vinylpyridine and /V-vinylpyrrolidone can be polymerized under similar conditions, and also after decomposition of a monomer-peroxide complex. On the other hand, styrene, methyl methacrylate, isoprene, methyl acrylate, vinyl acetate and ascorbic acid do not polymerize under these conditions. Complex formation between persulphate and these monomer donors is more favourable energetically [165]. The complex is more stable, it is not decomposed into initiating radicals and polymerization does not occur. 

Mende M, Petzold G, Buchhhammer UM (2002) Poly electrolyte ctnnplex formation between poly(diallyldimethylammonium chloride) and copolymers of acrylamide and sodium-acrylate. Colloid Polym Sci 280 342-351... 

To demonstrate the high eflBciency of SLS studies using the improved scattering curve analysis, the results obtained on PEC formation between anionically and cationically modified poly(acrylamide) are given in this paper in more detail, also considering the information from other methods. 

In the pulp and paper industry, anionic and cationic acrylamide polymers are used as chemical additives or processing aids. The positive effect is achieved due to a fuller retention of the filler (basically kaoline) in the paper pulp, so that the structure of the paper sheet surface layer improves. Copolymers of acrylamide with vi-nylamine not only attach better qualities to the surface layer of.paper, they also add to the tensile properties of paper in the wet state. Paper reinforcement with anionic polymers is due to the formation of complexes between the polymer additive and ions of Cr and Cu incorporated in the paper pulp. The direct effect of acrylamide polymers on strength increases and improved surface properties of paper sheets is accompanied by a fuller extraction of metallic ions (iron and cobalt, in addition to those mentioned above), which improves effluent water quality. 

In previous works [18-20,23,102] water-soluble polymers such as polyacrylamide (pAM), polysodium acrylate (pAA Na), poly(acrylamide-sodium acrylate) (pAM-AA Na), poly(acrylamide-diallyethylamine-hy-drochloride) (pAM-DAEA-HCl), and poly(acrylamide-sodium acrylate-diallyethylamine-hydrochloride) (pAM-AANa-DAEA-HCl) were used in the recovery of cations and some radioactive isotopes from aqueous solutions. It was found that the floe is formed between the added polymer and ions of the solution in the flocculation process with the formation of a crosslinked structure. The formed cross-linked structure is characterized by [103-105] ... 

Figure 8.2 Polyacrylamide gel formation and hydrolysis of acrylamide to acrylate. (A) Acrylamide and A,A-methylenebisacrylamide (bis) are copolymerized in a reaction catalyzed by ammonium persulfate [(NH4)2S208] and TEMED. (B) A very short stretch of cross-linked polyacrylamide is represented. Cross-linking between similar structures leads to the formation of ropelike bundles of polyacrylamide that are themselves cross-linked together forming the gel matrix. In the lower portion of (B) is shown how pendant, neutral carboxamide groups can become hydrolyzed to charged carboxyls.

Crosslinked polyacrylamide latexes encapsulating microparticles of silica and alumina have also been prepared by this method [179], Three steps are involved a) formation of a stable colloidal dispersion of the inorganic particles in an aqueous solution containing acrylamide, crosslinker, dispersant, and initiator b) HIPE preparation with this aqueous solution as the dispersed phase and c) polymerisation. The latex particles are polyhedral in shape, shown clearly by excellent scanning electron micrographs, and have sizes of between 1 and 5 pm. 

The reaction of acrylamide copolymers and taurine was studied at temperatures between 125° and 200° C, reaction time 2-7 hours, and taurine charge 10-100 mol% based on polymer. The substituted amide formation was determined by NMR and colloid titration. The C-13 NMR of the product exhibits carbonyls consistent with the formation of a secondary amide. The spectrum also exhibits two new methylene signals for the incorporated taurine at chemical shifts slightly different from the starting taurine. Additionally, the chemical shifts for the signals of taurine are pH dependent, whereas little change in chemical shift is observed for the signals of the incorporated taurine. The presence of sulfonate incorporated into the polymer was detected and quantitatively determined by colloid titration at pH 2.5. 

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