Hq. Xie et al., 3 WAYS TO IMPROVE ELECTRORHEOLOGICAL PROPERTIES OF POLYANILINE-BASED SUSPENSIONS, Journal of applied polymer science, 64(8), 1997, pp. 1641-1647
In order to improve further the electrorheological (ER) properties of
polyaniline (PAn)-based suspensions, i.e., to enhance the static yield
stress and to reduce the current density, three methods, namely, coat
ing of the PAn particles with polymer, grafting on the particles with
acrylamide, and nonequilibrium dedoping of the PAn particles with conc
entrated ammonia water, were tried. The results showed that PAn partic
les coated with poly(vinyl alcohol) or grafted with polyacrylamide can
increase the static yield stress and decrease the current density of
the ER suspension, whereas coating with poly (methyl methacrylate) or
polystyrene reduced both the current density and the static yield stre
ss. Nonequilibrium dedoping of the dried, protonated PAn particles wit
h concentrated ammonia water showed the best effect on the ER properti
es of the suspension, exhibiting a static yield stress of 16 kPa with
a current density of 2.7 mu A/cm(2) under a 2.8 kV/mm de electric fiel
d. (C) 1997 John Wiley & Sons, Inc.