Formation of polymer–colloid complexes of aluminoxane particles with poly(acrylic acid) and its copolymers with acrylamide

Novakov, I. A.; Radchenko, Philipp S.; Ozerin, A. S.; Rybakova, Elena V.; Radchenko, S. S.

doi:10.1007/s00396-011-2446-4

Cited by 2 publications

(1 citation statement)

References 36 publications

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“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Radchenko¹,

Novakov²,

Rdachenko³

et al. 2012

JMSR

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Viscoelastic properties of hydrogels based on polymer-colloid complexes of aluminoxane particles with acrylamide-acrylic acid copolymers were studied. Rheometric measurements were performed with an MFR 2000 Fourier microrheometer (GBS, Australia) under the regime of oscillating loads with the use of the dynamic mechanical analysis. It is shown that, with copolymer concentrations above the crossover point, the phase anglewww.ccsenet.org/jmsr Journal of Materials Science Research Vol. 1, No. 2; April 2012 ISSN 1927-0585 E-ISSN 1927-0593120 decreases abruptly; that is, the elastic characteristics of the gels decline. The maximum elastic properties of the gels for all copolymers are attained at the molar ratio of reagents Z ≈ 1. The effect of strain rate on relaxation processes in the gels was investigated. It is found that, at low strain rates, irreversible deformations (flow) can take place, and with an increase in frequency, the strength of physical networks formed with participation of aluminoxane particles tends to increase.

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Section: Introductionmentioning

confidence: 99%

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

Radchenko¹,

Novakov²,

Rdachenko³

et al. 2012

JMSR

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

Radchenko¹,

Новаков²,

Radchenko³

et al. 2013

CMATERIALS

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The rheological behavior of hybrid hydrogels of weakly charged polyelectrolytes with alumino xane particles (APs) formed by noncovalent interactions has been studied. This interaction observed for the polyelectro lyte Praestol-2500 is the most pronounced and is due to strong electrostatic noncovalent bonds between positively charged APs and anionic groups of the copolymer. By the methods of capillary, rotational, and vibrational rheo metry, it has been ascertained that two processes compete: the co mpacting of coils of macro molecu les and their crosslinking through APs. The latter process dominates at relatively high concentrations of reagents, and depends on ratios between polymer units and APs and the presence of a low-molecular-mass indifferent electrolyte (NaCl). Formed hybrid hydrogels relate to physical gels with the unstable nature of the network o f physical bonds, and under the action of shear stress demonstrate "Weissenberg effect." The method of dynamic mechanical analysis with the use of a micro-Fourier rheo meter has shown that the ratio storage modulus -loss modulus depends on the amount of AP sol and its ratio to the quantity of copolymer in the init ial mixture. A scheme for spatial structure hybrid hydrogels has been suggested.

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Formation of polymer–colloid complexes of aluminoxane particles with poly(acrylic acid) and its copolymers with acrylamide

Cited by 2 publications

References 36 publications

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

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

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

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