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Quantitative relationship between cavitation and shear rheology
Kyle C Bentz1, Naomi Sultan1, Daniel A Savin1
1George & Josephine Butler Polymer Research Laboratory, Center for Macromolecular Science & Engineering, Department of Chemistry, University of Florida, Gainesville, Florida 32611, USA. savin@chem.ufl.edu.
Soft Matter
|October 13, 2018
Summary
Cavitation rheology offers a simple method to measure polymer gel moduli. This study establishes a conversion factor linking cavitation and shear rheology, dependent on gel crosslink bond energy.
Area of Science:
- Materials Science
- Polymer Chemistry
- Rheology
Background:
- Cavitation rheology is a simple, cost-effective technique for polymer gel characterization.
- Widespread adoption is limited by a lack of direct comparisons with established methods like oscillatory shear rheology.
Purpose of the Study:
- To establish a quantitative relationship between gel moduli measured by cavitation rheology and oscillatory shear rheology.
- To identify factors influencing the correlation between these two rheological techniques.
Main Methods:
- Investigated three series of model polymer gels with different crosslinking chemistries: permanent covalent, dynamic-covalent, and physical hydrogen bonds.
- Determined gel moduli using both cavitation rheology and traditional oscillatory shear rheology.
Main Results:
- A simple proportionality constant was identified for converting moduli between cavitation and shear rheology.
- This constant demonstrated a strong dependence on the bond energy of the crosslinks responsible for gelation.
Conclusions:
- Cavitation rheology results can be reliably converted to shear rheology moduli using the derived proportionality constant.
- This provides a framework for broader application of cavitation rheology across various scientific disciplines.
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