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Poly(methyl methacrylate)‐coated carbonyl iron particles and their magnetorheological characteristics
Author(s) -
Jiang Wanquan,
Zhu Hong,
Guo Chaoyang,
Li Jianfeng,
Xue Qun,
Feng Jianghua,
Gong Xinglong
Publication year - 2010
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.2794
Subject(s) - carbonyl iron , magnetorheological fluid , materials science , methyl methacrylate , composite number , composite material , polymerization , suspension (topology) , methacrylate , emulsion polymerization , chemical engineering , particle (ecology) , suspension polymerization , poly(methyl methacrylate) , magnetic field , polymer chemistry , polymer , oceanography , physics , mathematics , quantum mechanics , homotopy , pure mathematics , engineering , geology
Magnetorheological fluids (MRFs) are types of suspensions that contain magnetic particles and a carrier fluid, and are considered as semi‐active smart materials. By tuning the strength of an external magnetic field, like other traditional MRFs, a carbonyl iron (CI)–poly(methyl methacrylate) (PMMA) particle‐based MRF can change reversibly from a fluid‐like state to a solid‐like state within milliseconds. In the research reported, CI particles were encapsulated with PMMA via emulsion polymerization. After the polymerization, the fabricated CI–PMMA composite particles were dispersed in a suspension medium to prepare MRF. The synthesized CI–PMMA composite particle‐based MRF showed a shear stress of 60 kPa at the magnetic field strength of 0.6 T, and a greatly enhanced anti‐sedimentation stability. Copyright © 2010 Society of Chemical Industry