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Influence of matrix stiffness on microstructure evolution and magnetization of magneto-active elastomers
Mehran Roghani1,2, Dirk Romeis1, Dmitry Borin3
1Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Strasse 6, Dresden, 01069, Germany. Roghani@ipfdd.de.
Soft Matter
|January 28, 2025
Summary
Field-induced microstructure evolution in Magneto-Active Elastomers (MAEs) significantly impacts their magneto-mechanical response. A unified mean-field model accurately predicts magnetization behavior and enables modulus prediction without elastic testing.
Area of Science:
- Materials Science
- Physics
- Mechanics
Background:
- Magneto-Active Elastomers (MAEs) exhibit complex coupled magneto-mechanical responses.
- Microstructure evolution under magnetic fields is crucial for MAE behavior.
- Classical models often simplify the internal microscopic deformations.
Purpose of the Study:
- To investigate the effect of field-induced microstructure evolution on the magnetization behavior of isotropic MAEs.
- To develop and validate a unified mean-field theoretical approach incorporating microscopic elastic energy.
- To establish a quantitative link between microstructural changes, magnetization, and mechanical properties.
Main Methods:
- Fabrication of MAE disks with varying matrix stiffness and particle volume fractions.
- Measurement of magnetization curves using vibrating sample magnetometry.
- Development of a unified mean-field model considering microscopic elastic energy and microstructure evolution (columnar structures).
Main Results:
- The unified mean-field model shows good quantitative agreement with experimental magnetization and magnetic differential susceptibility data.
- The model effectively captures microstructure evolution, particularly in highly filled MAE samples.
- Columnar structure formation is identified as an effective approach for modeling microstructure evolution.
Conclusions:
- Microstructure evolution is a key factor in the magneto-mechanical response of MAEs.
- The developed mean-field model provides accurate predictions and insights into MAE behavior.
- Magnetization measurements can be used to predict the mechanical modulus of MAEs, bypassing the need for direct elastic testing.
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