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PMMA coated carbonyl iron microbeads and their magnetic characteristics
Author(s) -
Kim Min Su,
Cho Min Sung,
Choi Hyoung Jin
Publication year - 2007
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200777351
Subject(s) - carbonyl iron , magnetorheological fluid , materials science , methyl methacrylate , dispersion polymerization , dispersion stability , rheology , dispersion (optics) , chemical engineering , rheometer , poly(methyl methacrylate) , polymerization , composite number , composite material , etching (microfabrication) , polymer chemistry , polymer , magnetic field , physics , layer (electronics) , quantum mechanics , optics , engineering
In order to improve the stability of magnetorheological (MR) fluid, we synthesized poly(methyl methacrylate) (PMMA) ‐ encapsulated carbonyl iron (CI) particles by an in‐situ dispersion polymerization method. In addition, PMMA shell was cross‐linked by a cross‐linking agent. The cross‐linked PMMA is expected to be more effective than non‐cross‐linked PMMA, improving the physical properties. The synthesized CIPMMA composite particles were characterized by SEM, and VSM. Cross‐linking of PMMA was also confirmed by measuring the FT‐IR after etching process. Rheological properties of the PMMA‐coated CI based MR fluid were measured via a rotational rheometer. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)