Magnetorheological Response for Magnetic Elastomers Containing Carbonyl Iron Particles Coated with Poly(methyl methacrylate)

Daichi Takahashi; Annadanam Venkata Sesha Sainath; Junko Ikeda; Kulisara Budpud; Tatsuo Kaneko; Mika Kawai; Tetsu Mitsumata

doi:10.3390/polym13030335

Magnetorheological Response for Magnetic Elastomers Containing Carbonyl Iron Particles Coated with Poly(methyl methacrylate)

Polymers (Basel). 2021 Jan 21;13(3):335. doi: 10.3390/polym13030335.

Authors

Daichi Takahashi¹, Annadanam Venkata Sesha Sainath², Junko Ikeda¹, Kulisara Budpud³, Tatsuo Kaneko³, Mika Kawai¹, Tetsu Mitsumata¹

Affiliations

¹ Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan.
² Fluoro-Agrochemicals, Polymers and Functional Materials Department, CSIR-Indian Institute of Chemical Technology, Hyderabad -500 007, India.
³ Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology, Nomi 923-1292, Japan.

Abstract

The magnetorheological response for magnetic elastomers containing carbonyl iron (CI) particles with a diameter of 6.7 μm 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 ΔG~N^2.8. The diameter of secondary particle of CI particles coated with PMMA was calculated to be 8.4 μm. SEM images revealed that the CI particles coated with PMMA aggregated in the polyurethane matrix.

Keywords: magnetic elastomer; soft material; stimuli-responsive gel.