The effects of adsorbed layers and solution polymer on the viscosity of dispersions containing associative polymers

Associative polymers adsorb on polymer lattices via hydrophobic interactions to generate dense layers that increase the hydrodynamic size of the particles but also reduce the polymer concentration in solution, thereby decreasing the continuum viscosity. The telechelic polymers employed in this work adsorb at low concentrations with both hydrophobes on the surface but at the concentrations of general interest have one hydrophobe free to couple with micelles in solution and adsorbed layers on other particles. Detailed measurements of adsorption and the steady shear viscosity of the dispersions provide consistent quantitative support for this scenario. The adsorbed amounts and layer thicknesses of hydrophobically modified poly(ethylene oxides) on poly(methylmethacrylate) particles suggest a dense layer of moderately stretched chains in very dilute dispersions. At higher concentrations, adsorption increases the intrinsic viscosity [η], by an amount consistent with the measured layer thickness, and the Huggins...

[1]  J. E. Glass,et al.  Adsorption of nonionic surfactants and model HEUR associative thickeners on oligomeric acid-stabilized poly(methyl methacrylate) latices , 1996 .

[2]  D. Sarazin,et al.  Neutron and X-ray scattering studies of model hydrophobically end-capped poly(ethylene oxide) Aqueous solutions at rest and under shear , 1996 .

[3]  H. Gaub,et al.  Molecular Organization of Surfactants at Solid-Liquid Interfaces , 1995, Science.

[4]  Alexei R. Khokhlov,et al.  Associating polymers: Equilibrium and linear viscoelasticity , 1995 .

[5]  M. Huldén.  Hydrophobically modified urethane—ethoxylate (HEUR) associative thickeners 2. Interaction with latex , 1994 .

[6]  R. Ettelaie,et al.  Thermodynamics of phase separation in mixtures of associating polymers and homopolymers in solution , 1994 .

[7]  T. G. M. Ven,et al.  Dynamic light scattering of suspensions of PEO-coated latex particles , 1994 .

[8]  S. Roberts,et al.  Phase behaviors and film properties of dispersions and coatings containing associative and conventional thickeners , 1993 .

[9]  J. E. Glass,et al.  Synthesis and solution properties of hydrophobically modified ethoxylated urethanes with variable oxyethylene spacer lengths , 1993 .

[10]  R. Buscall,et al.  The rheology of solutions of associating polymers: Comparison of experimental behavior with transient network theory , 1993 .

[11]  C. Silebi,et al.  Adsorption of model associative polymers on monodisperse polystyrene latex , 1992 .

[12]  T. Witten,et al.  Bridging attraction by telechelic polymers , 1992 .

[13]  F. Tanaka,et al.  Viscoelastic properties of physically crosslinked networks , 1992 .

[14]  C. Silebi,et al.  Steady-Shear and Linear-Viscoelastic Material Properties of Model Associative Polymer Solutions , 1991 .

[15]  M. Winnik,et al.  Onset of aggregation for water-soluble polymeric associative thickeners : a fluorescence study , 1990 .

[16]  W. Frith,et al.  The rheology of suspensions containing polymerically stabilized particles , 1989 .

[17]  P. R. Sperry,et al.  Effect of Surfactants and Cosolvents on the Behavior of Associative Thickeners in Latex Systems , 1986 .

[18]  W. Russel.  The Huggins coefficient as a means for characterizing suspended particles , 1984 .

[19]  T. Cosgrove,et al.  Segment density profiles of adsorbed polymers , 1984 .

[20]  M. Kawaguchi,et al.  Quasielastic Light Scattering Measurements of Polystyrene Latices and Conformation of Poly(oxyethylene) Adsorbed on the Latices , 1981 .

[21]  G. Batchelor.  The effect of Brownian motion on the bulk stress in a suspension of spherical particles , 1977, Journal of Fluid Mechanics.

[22]  S. Alexander,et al.  Adsorption of chain molecules with a polar head a scaling description , 1977 .

[23]  P. G. de Gennes,et al.  Collapse of a polymer chain in poor solvents , 1975 .

[24]  A. Tobolsky,et al.  A New Approach to the Theory of Relaxing Polymeric Media , 1946 .