The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform

Guisheng Yang - One of the best experts on this subject based on the ideXlab platform.

  • preparation of exfoliated Polyacrylic clay nanocomposites with high loading an investigation into the intercalation of ammonium terminated Polyacrylic Acid and polyacrylates
    Journal of Polymer Science Part B, 2008
    Co-Authors: Tongfei Wu, Guisheng Yang
    Abstract:

    Low-molecular-weight Polyacrylic Acid with amine chain end used as a macromolecular intercalating agent was synthesized by radical polymerization using 2-aminoethanethiol hydrochloride as chain transfer agent. Three polyacrylates (sodium polyacrylate-t-NH, calcium polyacrylate-t-NH, and zinc polyacrylate-t-NH) were prepared by neutralization from this Polyacrylic Acid using sodium hydroxide, zinc oxide, and calcium hydroxide as alkalies. The intercalation of ammonium-terminated Polyacrylic Acid and polyacrylate was investigated by viscosity measurement, XRD, and TEM. Using this ammonium-terminated Polyacrylic Acid as the intercalating agent, exfoliated Polyacrylic Acid/clay and polyacrylate/clay composites with a clay loading of ∼30 and 20 wt %, respectively, were prepared through the evaporation of solvent from their clay suspensions. The thermal degradation of Polyacrylic Acid/clay and polyacrylate/clay composites was also studied by TGA. © 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 2335–2340, 2008

  • Preparation of exfoliated Polyacrylic clay nanocomposites with high loading: An investigation into the intercalation of ammonium‐terminated Polyacrylic Acid and polyacrylates
    Journal of Polymer Science Part B: Polymer Physics, 2008
    Co-Authors: Tingxiu Xie, Guisheng Yang
    Abstract:

    Low-molecular-weight Polyacrylic Acid with amine chain end used as a macromolecular intercalating agent was synthesized by radical polymerization using 2-aminoethanethiol hydrochloride as chain transfer agent. Three polyacrylates (sodium polyacrylate-t-NH, calcium polyacrylate-t-NH, and zinc polyacrylate-t-NH) were prepared by neutralization from this Polyacrylic Acid using sodium hydroxide, zinc oxide, and calcium hydroxide as alkalies. The intercalation of ammonium-terminated Polyacrylic Acid and polyacrylate was investigated by viscosity measurement, XRD, and TEM. Using this ammonium-terminated Polyacrylic Acid as the intercalating agent, exfoliated Polyacrylic Acid/clay and polyacrylate/clay composites with a clay loading of ∼30 and 20 wt %, respectively, were prepared through the evaporation of solvent from their clay suspensions. The thermal degradation of Polyacrylic Acid/clay and polyacrylate/clay composites was also studied by TGA. © 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 2335–2340, 2008

Klaus Huber - One of the best experts on this subject based on the ideXlab platform.

  • Mixtures of Polyacrylic Acid and Nonionic Surfactants at the Water/Air Interface
    Journal of Colloid and Interface Science, 1994
    Co-Authors: Colette Maloney, Klaus Huber
    Abstract:

    Abstract The present work reports on aqueous solutions of the nonionic surfactant octaethylenglycol monododecyl ether and Polyacrylic Acid. By combining surface tension measurements with ellipsometry, supplementary results could be received on the surface layer of the aqueous solutions. At pH ⩾ 8, no interactions occur and the adsorbed film is essentially a surfactant layer. At pH = 3 and above the critical micelle concentration of the surfactant/polymer mixture, the surface tension is higher and the adsorbed layer much thicker than in the case of the pure surfactant solution, i.e., the surfactant film is modified by the presence of Polyacrylic Acid. This can be explained by the adsorption of Polyacrylic Acid into the interfacial surfactant layer, induced by H-bonding between Polyacrylic Acid and ethylenglycol units of the surfactant head group.

Colette Maloney - One of the best experts on this subject based on the ideXlab platform.

  • Mixtures of Polyacrylic Acid and Nonionic Surfactants at the Water/Air Interface
    Journal of Colloid and Interface Science, 1994
    Co-Authors: Colette Maloney, Klaus Huber
    Abstract:

    Abstract The present work reports on aqueous solutions of the nonionic surfactant octaethylenglycol monododecyl ether and Polyacrylic Acid. By combining surface tension measurements with ellipsometry, supplementary results could be received on the surface layer of the aqueous solutions. At pH ⩾ 8, no interactions occur and the adsorbed film is essentially a surfactant layer. At pH = 3 and above the critical micelle concentration of the surfactant/polymer mixture, the surface tension is higher and the adsorbed layer much thicker than in the case of the pure surfactant solution, i.e., the surfactant film is modified by the presence of Polyacrylic Acid. This can be explained by the adsorption of Polyacrylic Acid into the interfacial surfactant layer, induced by H-bonding between Polyacrylic Acid and ethylenglycol units of the surfactant head group.

Tingxiu Xie - One of the best experts on this subject based on the ideXlab platform.

  • Preparation of exfoliated Polyacrylic clay nanocomposites with high loading: An investigation into the intercalation of ammonium‐terminated Polyacrylic Acid and polyacrylates
    Journal of Polymer Science Part B: Polymer Physics, 2008
    Co-Authors: Tingxiu Xie, Guisheng Yang
    Abstract:

    Low-molecular-weight Polyacrylic Acid with amine chain end used as a macromolecular intercalating agent was synthesized by radical polymerization using 2-aminoethanethiol hydrochloride as chain transfer agent. Three polyacrylates (sodium polyacrylate-t-NH, calcium polyacrylate-t-NH, and zinc polyacrylate-t-NH) were prepared by neutralization from this Polyacrylic Acid using sodium hydroxide, zinc oxide, and calcium hydroxide as alkalies. The intercalation of ammonium-terminated Polyacrylic Acid and polyacrylate was investigated by viscosity measurement, XRD, and TEM. Using this ammonium-terminated Polyacrylic Acid as the intercalating agent, exfoliated Polyacrylic Acid/clay and polyacrylate/clay composites with a clay loading of ∼30 and 20 wt %, respectively, were prepared through the evaporation of solvent from their clay suspensions. The thermal degradation of Polyacrylic Acid/clay and polyacrylate/clay composites was also studied by TGA. © 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 2335–2340, 2008

K. Sivadasan - One of the best experts on this subject based on the ideXlab platform.

  • A unique conformational equilibrium of Polyacrylic Acid at the solid/liquid interface
    Colloids and Surfaces A: Physicochemical and Engineering Aspects, 1995
    Co-Authors: Joy T. Kunjappu, Ponisseril Somasundaran, K. Sivadasan
    Abstract:

    Abstract The adsorption of Polyacrylic Acid onto an alumina surface is shown using fluorescence spectroscopy to be followed by a rearrangement of its macromolecular segments in the adsorbed state. The adsorption of pyrene-labelled Polyacrylic Acid has been investigated from its solutions and from solutions mixed with unlabelled Acid. The excimer efficiency of the emission of the pyrene-labelled polymer species indicates a pH-independent equilibrium conformation of adsorbed polymer chains. While the slow conformational rearrangement may not affect rapid flocculation processes, it could affect slow flocculation as well as deaggregation and reaggregation processes.