A study of structural and molecular weight characteristics of poly(aluminum hydroxychloride) nanoparticles by small-angle X-ray scattering and sedimentation analysis

Rheological Properties of Hybrid Hydrogels of Weakly Charged Polyelectrolytes Crosslinked by Aluminoxane Particles

“…a) b) Figure 19. Scattering particles in sol: a) silica (rd = 4-6 nm, df = 2.5) [47]; b) aluminoxane particles (rd = 2.2 nm and df = 1.0) [28] With due account for this similarity and results of [47], a similar scheme for the spatial structure of hybrid hydrogels may be suggested In such a scheme, alu mino xane particles play the role of network junctions that bind polyelectrolyte macro molecules into a co mmon spatial network. It is clear that the density of such a network is determined by the amount of particles, and its strength depends on the nature of noncovalent bonds of particles with poly mer chain units, which are the most pronounced for colu mn interactions typical for weakly anionic Pr-2500.…”

“…A dispersion of APs was prepared fro m an alu minu m alloy in the form of an aqueous sol containing 13.5 wt% Al 3+ and with the atomic ratio Cl -/Al 3+ = 0.45. The technique of preparation and the characteristics of the sol as well as the dimensional and fractal characteristics of APs were described in [27], [28].…”

“…[27] On the basis of s mall-angle X-ray scattering studies, APs may be related to physical fractals having an internal self-similar structure with a fractal dimensionality d f = 1.0 and a radius of gyration r g = 1.6 nm. [28] Various kinds of noncovalent interactions are typical for APs. As a consequence, they may form polycomplexes both with nonionogenic polyacrylamide (PAA) [24], [26] and with its cation-active [29] and anion-active [30] copoly mers.…”

Flocculating Properties of Water-Soluble Polymer-Colloid Complexes of Aluminoxane Particles with Weakly Charged Cationic Polyelectrolytes

“…Therefore, the area of this surface plays the decisive role on condition that reactive centers occur on it. As it was shown in [15], that is why low-molecular-mass aluminum salts do not form PCCs with polyacrylamide, while high-basicity APHC sols, which represent the dispersed system of aluminoxane particles (APs) mostly composed of species with a size of 4.6 nm and a specific surface area of 3 × 10 2 m 2 /cm 3 [28,29] form soluble PCCs with the nonionogenic PAA.…”

Rheological Study of Polymer--Colloid Complexes of Aluminoxane Particles with Weakly Charged Polyelectrolytes in Semidilute Aqueous Solutions

“…Only some of them, which contain on the surface of particles acidic or basic groups capable of ionization with a change in the pH of aqueous solutions, may be rather stable against aggregation in a certain pH range due to the presence of the double electric layer. Examples of these dispersed systems are sols of aluminum polyhydroxochloride containing aluminoxane particles (APs) with characteristic sizes of 4-6 nm (Zakharchenko, et al, 2006;Ozerin, et al, 2009) and forming polycomplexes with a number of water-soluble polymers (Novakov, Radchenko & Papisov, 2005& 2007Novakov, et al, 2006Novakov, et al, & 2011. The rheological behavior of these systems depends on concentration of a polymer, its properties, presence of intra-and intermolecular bonds, amount of the crosslinking agent, etc.…”