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Title of Journal: Rheol Acta

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Abbravation: Rheologica Acta

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Springer-Verlag

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DOI

10.1007/978-3-540-45152-5_8

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1435-1528

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Scaling and mesostructure of Carbopol dispersions

Authors: Iris A Gutowski David Lee John R de Bruyn Barbara J Frisken
Publish Date: 2012/01/18
Volume: 51, Issue: 5, Pages: 441-450
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Abstract

Rheological measurements were performed on aqueous dispersions of two commercial crosslinked polymer microgels Carbopol Ultrez 10 and Carbopol ETD 2050 prepared over a wide range of concentration and pH For all concentrations studied both the yield stress and the elastic modulus initially increased dramatically with pH and displayed broad peaks at intermediate pH This is consistent with the onset of jamming of the Carbopol particles due to a rapid increase in particle size caused by osmotic swelling in the presence of NaOH Scaling of both yield stress and elasticity with concentration was observed only at higher concentrations which we believe indicates a change from a percolated structure at low volume fractions to a space filling network of compressed particles at high volume fractions This model is supported by confocal microscopy of fluorescently dyed Carbopol dispersionsWe would like to thank Lester Poon Sharan Swarup and Tim Helslip for help with fluorescence microscopy and Felix Oppong for assistance with rheological measurements This research was supported by the Natural Science and Engineering Research Council of Canada


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  1. Effect of morphology on the interfacial slip of immiscible polypropylene/polystyrene blends
  2. Amorphous and crystalline states of ultrasoft colloids: a molecular dynamics study
  3. A hierarchical multi-mode MSF model for long-chain branched polymer melts part II: multiaxial extensional flows
  4. Novel bitumen/isocyanate-based reactive polymer formulations for the paving industry
  5. Can dynamical mechanical measurements predict brittle fracture behaviour?
  6. Self-reinforcement of polymers as a consequence of elongational flow
  7. The role of convective constraint release in parallel superposition flows of nearly monodisperse entangled polymer solutions
  8. Influence of the initial cooling temperature on the gelation and yield stress of waxy crude oils
  9. Molecular architecture and linear viscoelasticity of homogeneous ethylene/styrene copolymers
  10. Flow analysis of the weld line formation during injection mold filling of thermoplastics
  11. Squeeze flow of soft solids between rough surfaces
  12. Molecular orientation in non-Newtonian flow of dilute polymer solutions around spheres
  13. The contribution of frictional contacts to the shear strength of coarse glass bead powders and slurries
  14. End effects in rotational viscometry II. Pseudoplastic fluids at elevated Reynolds number
  15. Rheological behaviour of a high-melt-strength polypropylene at elevated pressure and gas loading for foaming purposes
  16. The effect of premature wall yield on creep testing of strongly flocculated suspensions
  17. Rheological and morphological properties of PA6/ECO nanocomposites
  18. Orientation distribution in injection molding: a further step toward more accurate simulations
  19. Fractal analysis of viscoelastic data with automated gel point location and its potential application in the investigation of therapeutically modified blood coagulation
  20. Modeling confinement in polymer nanocomposites from linear viscoelasticity data
  21. Linear viscoelasticity of styrenic block copolymers–clay nanocomposites
  22. On exact solutions of the flow equations for Bingham visco-plastic fluids through an eccentric annular cross-section
  23. A computational extensional rheology study of two biofluid systems
  24. Power-law creep and residual stresses in a carbopol gel
  25. Electrorheological response of SnO 2 and Y 2 O 3 nanoparticles in silicon oil
  26. Generation of inkjet droplet of non-Newtonian fluid
  27. Study of the non-isothermal glass fibre drawing process
  28. Influence of molecular parameters on the stress dependence of viscous and elastic properties of polypropylene melts in shear
  29. An error-minimizing approach to inverse Langevin approximations

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