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Synthesis and characterization of magnetorheological polyimide gels
Author(s) -
Fuchs A.,
Hu B.,
Gordaninejad F.,
Evrensel C
Publication year - 2005
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.22423
Subject(s) - magnetorheological fluid , polyimide , materials science , polymer , rheology , polymer chemistry , chemical engineering , diamine , viscosity , particle (ecology) , settling , solvent , particle size , composite material , chemistry , organic chemistry , damper , oceanography , structural engineering , layer (electronics) , environmental engineering , engineering , geology
Magnetorheological polymer gels (MRPGs) are composite fluids containing ferrous particles suspended in a polymer gel. In addition to modification of the carrier fluid, the polymer gel, which includes crosslinked copolyimide (CCPI) and solvent N ‐octylpyrrolidone, also changes the surface properties of the ferrous particles, thus reducing the particle settling and improving particle redispersion. The viscosity of MRPGs can be easily adjusted by controlling the concentration of CCPI in the carrier medium. High thermally resistant CCPI is synthesized from dianhydride, diamine, diaminobenzonic acid, and crosslinker and has a high glass transition temperature because the crosslinking ratio can be controlled by the molar ratio of diamine to diaminobenzonic acid. The redispersion and rheological properties are also investigated. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 2402–2413, 2005