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Viscometric properties of viscous theta solutions of monodisperse polystyrene

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Abstract

Theta solvents for polystyrene are prepared from high-viscosity blends of styrene and low-molecular-weight polystyrene, and then used to make dilute solutions with monodisperse polystyrene solutes of high-M = 2.3, 6.0, 9.0, 18.0 · 105. A Weissenberg rheogoniometer is used to measure the non-Newtonian viscosityη as a function of shear stressτ, for lowτ values, and also the complex viscosity componentsη′ andη″ as functions of frequencyω. A capillary viscometer is used for high-τ measurements ofη(τ). Viscometric properties, at room temperature, are analyzed as functions of high-molecular-weight solute concentrationc with parameters of constantτ orω to obtain [η(τ)], [η′ (ω)], and [η″ (ω)]. Such a collection of data has apparently not previously been available for polymers in theta solvents (in which Gaussian chain statistics prevail). Also unique is the achievement of high stress (τ = 2 ⋅ 104 Pa) at low shear rate, by virtue of high solvent viscosity which is not characteristic of other known theta solvents.

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Authors and Affiliations

  1. Shell Oil Co., Head Office Process Engineering, 77001, Houston, TX, USA

    J. E. McAdams

  2. Chemical Engineering Department, University of California, Berkeley, 94720, Berkeley, CA, USA

    M. C. Williams

Authors
  1. J. E. McAdams
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  2. M. C. Williams
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McAdams, J.E., Williams, M.C. Viscometric properties of viscous theta solutions of monodisperse polystyrene. Rheol Acta 25, 102–109 (1986). https://doi.org/10.1007/BF01332129

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  • DOI: https://doi.org/10.1007/BF01332129

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