Effect of Water on Viscosity and Shear-Thickening Behavior of Telechelic Ionomers in Nonpolar Solvents

Bhargava, Swati; Cooper, Stuart L.

doi:10.1021/ma970889c

Cited by 20 publications

(19 citation statements)

References 38 publications

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“…[47,51,52] Solutions often exhibit shear thickening and shear thinning. The nonlinear steady-state behaviour of a,x-LiPSS100 in toluene solutions, within a concentration range slightly below and above C gel , has been investigated by classical rheometry and flow birefringence measurements.…”

Section: Steady-shear Measurements (Nonlinear Rheology)mentioning

confidence: 99%

Association of Telechelic Ionomers in Apolar Solvents

Chassenieux

Nicolai

Tassin

et al. 2001

Macromol. Rapid Commun.

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The associative properties of well‐defined halatotelechelic ionomers in an apolar solvent were studied by means of dynamic mechanical spectroscopy, small‐angle X‐ray scattering, as well as static and dynamic light scattering. The effect of end‐functionalisation was investigated by comparing results on polystyrene (PS) and polyisoprene (PI) precursors using PS and PI of the same molar mass modified at one or both ends with sulfonate groups. The molar‐mass dependence was investigated by comparing difunctionalised samples with different molar masses and the influence of the backbone by comparing polystyrene and polyisoprene. Experimental data suggest a relatively simple model for the association of this material. At low concentrations, the polymer chains organise themselves into well‐defined reversed micelles, so‐called flowers. Above a certain concentration C+, the flowers associate into larger aggregates according to an open association mechanism. At a critical concentration Cgel, the aggregates fill the whole space and a transient network is formed most likely by a percolation process. A semi‐quantitative description of the associating process can be obtained by considering an open association mechanism properly combined with inter‐particle interactions.

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Section: Steady-shear Measurements (Nonlinear Rheology)mentioning

confidence: 99%

Association of Telechelic Ionomers in Apolar Solvents

Chassenieux

Nicolai

Tassin

et al. 2001

Macromol. Rapid Commun.

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“…The shear-thickening phenomenon is observed for polymers having a few segments capable of association, such as hydrophilic polymers containing a few hydrophobic groups, 1,2,3,4,5,6,7 and ionomers. 8,9 In solution, these associative polymers construct a physically cross-linked network due to temporary connections among their associative segments (physical gel). A typical example of such a physical gel is HEUR (hydrophobically modified ethoxylated urethane) aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Shear-Thickening in Physical Gel by Transient Network Theory

Indei¹

2004

AIP Conference Proceedings

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A formula of steady shear viscosity is derived by introducing a model to describe the dynamics of physically cross-linked network (physical gel), and successfully analyzes the shear-thickening behavior observed in HEUR aqueous solutions by Jenkins, Sileibi and El-Aasser. We take into account the effects of looped chains at junctions which detach their one end from the junction as the shear rate increases due to the collisions with other chains. This process produces the weak and wide enhancement of the number of chains whose both ends stick to the separate junctions (active chains) leading to the weak increase in the shear viscosity. It is also shown that the nonlinear force sustained by active chains induces the strong and sharp enhancement of the steady shear viscosity.

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“…They could also be used as good model ionomers after neutralization. 20,21 Furthermore, these materials could potentially be applied as supports for nanoparticles such as iron oxide to form nanocomposites. Such nanocomposites can possess superparamagnetic properties and optical transparency in the UV-visible range.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of high molecular weight carboxylated polybutadiene

Gong

Wool

Friend

et al. 1999

J. Polym. Sci. A Polym. Chem.

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High molecular weight carboxylated polybutadienes (cPBDs) with number‐average molecular weight (Mn) from 98,000 to 200,000 and carboxylic acid (COOH) contents of 0.5–10 mol % were successfully synthesized through hydrocarboxylation of polybutadienes (PBDs) at temperatures of 140–150°C using PdCl2(PPh3)2 and SnCl2 · 2H2O catalysts. At low extents of hydrocarboxylation (COOH < 6 mol %), glass transition temperatures (Tg's) of the resulting cPBDs did not change considerably (<10°C). Significant chain scission and crosslinking was not detected during the chemical modification process. Characterization of the microstructures of cPBDs by FTIR, 13C‐NMR, and Raman spectroscopy showed that the carboxylic groups were incorporated on the pendant (1,2) PBD double bonds as well as the backbone (1,4) double bonds, indicating the hydrocarboxylation reaction did not solely occur at the terminal carbons of the pendant double bonds. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 3129–3138, 1999

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Effect of Water on Viscosity and Shear-Thickening Behavior of Telechelic Ionomers in Nonpolar Solvents

Cited by 20 publications

References 38 publications

Association of Telechelic Ionomers in Apolar Solvents

Association of Telechelic Ionomers in Apolar Solvents

Analysis of Shear-Thickening in Physical Gel by Transient Network Theory

Synthesis and characterization of high molecular weight carboxylated polybutadiene

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