поліакрилова кислота

Organic-inorganic hydrophilic composites based on sodium polyacrylate (PAANa) and poly-N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (PAPTMS) showed the improved swelling capacity at incorporation of PAPTMS. Changing of non-Fickian to Super case II swelling behaviour is observed at 20 wt % PAPTMS content. Enhancing of thermal stability and heat-resistance index of composite hydrogels compared to PAA is shown.

This paper is devoted to study of sorption properties (sorption degree, polymer chain binding degree) of intergel system hydrogel of polyacrylic acid (hPAA) – hydrogel of poly-4-vinylpyridine (hP4VP) in relation to neodymium and praseodymium ions. It was found that remote interaction of the polymers in intergel pairs provides significant changes of the electrochemical and volume gravimetric properties. Strong increase of the swelling degree of hPAA is observed at the ratio 17%hPAA-83%hP4VP; significant increase of swelling degree of hP4VP is observed at the ratio 83%hPAA-17%hP4VP.

 The process of formation of cobalt (II) ion complexes with polyacrylic acid, their influence on the size of the tangle of polyacrylic acid macromolecules and the concentration of monomer units in it have been studied. It is shown that the reaction at a temperature of 20–300 ºC forms a complex in which the cobalt ion binds two carboxyl groups of polyacrylic acid. Binding of the third carboxyl group to the complex is prevented by a sufficiently flexible polyacrylic acid chain. Increasing the temperature significantly increases the flexibility of the polyacrylic acid chain.