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A study of the electrorheological effect of γ‐Fe 2 O 3 /polyacrylate composite particles
Author(s) -
Li Xiucuo,
Zhang Liucheng,
Jin Riguang
Publication year - 1999
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/(sici)1099-1581(199901/02)10:1/2<90::aid-pat774>3.0.co;2-w
Subject(s) - materials science , ammonium bromide , silicone oil , comonomer , composite number , electrorheological fluid , lithium (medication) , particle size , chemical engineering , emulsion , composite material , particle (ecology) , emulsion polymerization , silicone , amide , pulmonary surfactant , polymerization , polymer chemistry , electric field , organic chemistry , chemistry , polymer , medicine , oceanography , physics , quantum mechanics , geology , engineering , endocrinology
γ‐Fe 2 O 3 /polyacrylate composite particles were synthesized through inversed emulsion polymerization. The particles were then dispersed in silicone oil, forming the electrorheological fluid. The effects of the chemical constitution of the particles, including the content of γ‐Fe 2 O 3 , the crosslinking agent N,N′‐methylene‐bis acryl‐amide (MBAM) and the comomoner maleic anhydride (MA) on the shear stress of the fluid were investigated under direct and alternating electrical fields respectively. The influence of the emulsifying agent concentration during the particle preparation on the electrorheological (ER) effect of the fluid was studied. The results show that the ER effects are different under direct and alternating electrical fields. The ER effects of the γ‐Fe 2 O 3 /lithium polyacrylate particles at some γ ‐Fe 2 O 3 contents are stronger than that of the lithium polyacrylate especially under alternating fields. The contents of the crosslinking agent MBAM, the comonomer MA and the emulsifying agent cetyltrimethyl ammonium bromide influence the ER effects and the morphology of the composite particles. Copyright © 1999 John Wiley & Sons, Ltd.