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Viscoelastic properties of poly(ethylene oxide) solution

D M Yu1, G L Amidon, N D Weiner

  • 1College of Pharmacy, University of Michigan, Ann Arbor 48109-1065.

Journal of Pharmaceutical Sciences
|October 1, 1994
PubMed
Summary

Poly(ethylene oxide) (PEO) solutions exhibit shear-thinning behavior. High molecular weight PEO shows increased elasticity due to entanglement, while solvent composition significantly impacts viscoelastic properties.

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Area of Science:

  • Polymer Science
  • Rheology
  • Materials Science

Background:

  • Poly(ethylene oxide) (PEO) is a versatile polymer with applications requiring specific viscoelastic properties.
  • Understanding PEO solution rheology is crucial for optimizing its performance in various formulations.

Purpose of the Study:

  • To investigate the viscoelastic properties of poly(ethylene oxide) (PEO) solutions.
  • To determine the influence of molecular weight, concentration, solvent composition, and salt on PEO rheology.

Main Methods:

  • Dynamic oscillatory testing was employed to measure viscoelastic parameters.
  • Measurements included storage modulus (G1), loss modulus (G2), complex viscosity (eta*), and loss tangent (tan delta).
  • Experiments were conducted over a frequency range of 10(-3)-2.5 Hz at 30°C.

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Main Results:

  • High molecular weight PEO solutions demonstrated increased elasticity due to chain entanglement.
  • Complex viscosity exhibited shear-thinning (power-law) behavior, consistent with the Cox-Merz rule.
  • Increasing water content in mixed solvents and PEO concentration significantly enhanced both storage and loss moduli.
  • NaCl addition (up to 2% w/w) did not adversely affect the viscoelasticity of a 10% PEO solution.

Conclusions:

  • PEO viscoelasticity is highly tunable via molecular weight, concentration, and solvent composition.
  • Entanglement effects dominate the rheological response of high molecular weight PEO.
  • The findings provide valuable insights for formulating PEO-based materials with desired flow properties.