Journal
POLYMERS
Volume 13, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/polym13030335
Keywords
soft material; stimuli-responsive gel; magnetic elastomer
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Funding
- Cooperative Research Program of the Network Joint Research Center for Materials and Devices [20201324]
- Nagai NS Promotion Foundation for Science of Perception
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The study investigated the magnetorheological response of magnetic elastomers containing CI particles coated with PMMA. By analyzing the thickness of the PMMA layer and the decrease in storage modulus, the diameter of secondary particles and aggregation behavior in the polyurethane matrix were determined.
The magnetorheological response for magnetic elastomers containing carbonyl iron (CI) particles with a diameter of 6.7 mu m coated with poly(methyl methacrylate) (PMMA) was investigated to estimate the diameter of secondary particles from the amplitude of magnetorheological response. Fourier-transformed infrared spectroscopy revealed that the CI particles were coated with PMMA, and the thickness of the PMMA layer was determined to be 71 nm by density measurement. The change in the storage modulus for magnetic elastomers decreased by coating and it was scaled by the number density of CI particles as Delta G similar to N-2.8. The diameter of secondary particle of CI particles coated with PMMA was calculated to be 8.4 mu m. SEM images revealed that the CI particles coated with PMMA aggregated in the polyurethane matrix.
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