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Solution Blow Spinning of Polymeric Nano-Composite Fibers for Personal Protective Equipment
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Simple Shearing Flows in Polyisobutylene Solutions.

L J Zapas1, J C Phillips1

  • 1Institute for Basic Standards, National Bureau of Standards, Washington, D.C. 20234.

Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry
|December 8, 2021
PubMed
Summary
This summary is machine-generated.

The BKZ elastic fluid theory accurately describes shear stress in a 10 percent polyisobutylene (PIB) solution. This model effectively correlates measurements across various shearing flow histories for this viscoelastic fluid.

Keywords:
BKZ fluidnonlinear behaviorpolyisobutylenestress relaxationviscosity

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Area of Science:

  • Rheology
  • Polymer Science
  • Fluid Dynamics

Background:

  • Understanding the viscoelastic behavior of polymer solutions is crucial in various industrial applications.
  • Polyisobutylene (PIB) solutions exhibit complex flow properties that require sophisticated theoretical models for accurate prediction.
  • Characterizing shear stress under different flow histories is essential for material characterization.

Purpose of the Study:

  • To correlate shear stress measurements with the BKZ elastic fluid theory.
  • To validate the applicability of the BKZ model for a 10 percent PIB solution in cetane.
  • To analyze the response of the PIB solution to diverse shearing flow histories.

Main Methods:

  • Experimental measurements of shear stress at 25 °C.
  • Application of various shearing flow histories, including single step stress relaxation, suddenly applied steady shear, steady shearing flow, and stress relaxation after steady shear.
  • Correlation of experimental data with predictions from the BKZ elastic fluid theory.

Main Results:

  • Shear stress measurements for the 10 percent PIB solution were successfully correlated using the BKZ elastic fluid theory.
  • The BKZ model demonstrated good agreement with experimental data across the tested shearing flow histories.
  • The study provides quantitative validation of the BKZ theory for this specific polymer solution.

Conclusions:

  • The BKZ elastic fluid theory provides a robust framework for describing the rheological behavior of 10 percent PIB solutions.
  • The findings support the utility of the BKZ model in predicting the response of viscoelastic fluids to complex flow conditions.
  • This work contributes to a better understanding of polymer solution rheology and its theoretical underpinnings.