Journal ArticleDOI
Intermacromolecular amidization in dilute aqueous solution of a polyelectrolyte complex of polyacrylic acid and linear polyethylene imine
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In this paper, the formation of intermacromolecular amide bonds in a polyelectrolyte salt complex of polyacrylic acid and linear polyethylene imine on heating in dilute solution was studied.Abstract:
IR spectroscopy was used to study the formation of intermacromolecular amide bonds in a polyelectrolyte salt complex of polyacrylic acid and linear polyethylene imine on heating in dilute solution. It was shown that in contrast with low molecular weight systems, the reaction of intermacromolecular condensation in dilute aqueous solutions takes place to high degrees of transformation to form water-soluble products.read more
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Crosslinked hemicellulose citrate–chitosan aerogel foams
TL;DR: In this paper, the incorporation of carboxylic acid groups into hemicellulose via reaction with citric acid followed by cross linking with chitosan greatly improved the properties relative to hemicella, chitosa, a cellulose sponge product, and hemicelloose citrate alone.
Journal ArticleDOI
Features of the phase transitions in aqueous salt solutions of non-stoichiometric polyelectrolyte complexes☆
TL;DR: In this paper, phase separation in aqueous salt solutions of non-stoichiometric polyelectrolyte complexes formed by polyacrylic acid and linear polyethylenimine was studied.
Journal ArticleDOI
Structure and properties of crosslinked hydrogels based on the polyelectrolyte complex polyacrylic acid-polyethyleneimine
TL;DR: In this paper, it is shown that by varying the nature and the ratio of the stabilizing gel-ionic, covalent and hydrogen bonds one may within wide limits change the properties of the hydrogels of the polyelectrolyte complex, their stability in different media, swelling capacity and permeability in relation to water and dissolved substances.
Journal ArticleDOI
Transformation of the structure and properties of the complex of polyacrylic acid and linear polyethyleneimide on intracomplex amidation in aqueous solutions
TL;DR: In this paper, it was shown that the formation of interunit amide bonds in aqueous solutions of a polyelectrolyte complex to the point of deep conversions proceeds in intracomplex form and does not lead to the crosslinking of its particles between themselves.
Book ChapterDOI
Design, Structure, and Behavior of Interpolymer Complex Membranes
TL;DR: In this article, the authors considered polyelectrolyte complex (PEC) formation reactions between oppositely charged linear polyelectronylytes have been considered in detail and showed that a thin interfacial film of PEC about 20 nm thick is rapidly formed at higher polyethylene concentrations (above 0.6 wt.%, or about 0.03 N).
References
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Journal ArticleDOI
Formation of complexes between complementary synthetic polymers and oligomers in dilute solution review
V.A. Kabanov,I.M. Papisov +1 more
TL;DR: In this paper, the authors generalize the experimental and theoretical information in the literature on the fundamental properties of reactions between macromolecules of the type matrix+oligomer⇄polycomplex in relation to the chain length of the oligomer and the chemical structure of the polymer.
Journal ArticleDOI
Studies on polycondensation reactions of nylon salt. II.. The rate of polycondensation reaction of nylon 66 salt in the presence of water
TL;DR: The polycondensation reaction of nylon-66-salz has been studied in the presence of water in 0.5-10.0 molar ratio as discussed by the authors. But the reaction proceeds extremely fast and reaches equilibrium after about 5 hours at 200-220°C.
Journal ArticleDOI
The formation of amide linkages in polyelectrolyte salt complexes
TL;DR: In this paper, the formation of amide linkages in glassy polyelectrolyte complexes of poly-(acrylic acid) (PAA) and poly(methacric acid) with linear polyethyleneimide, has been investigated by IR spectroscopy.
Journal ArticleDOI
Structure and properties of polyelectrolyte complexes—products of incomplete reactions between poly-N,N-dimethylaminoethyl methacrylate and polyphosphates and polyacrylates
TL;DR: In this article, a model was proposed for the polycomplex particle, which incorporates two-fibre hydrophobic units-sequences of pairs of units of complementary macromolecules forming salt bonds with each other.