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Effect of ionic pendent groups on a polyaniline‐based electrorheological fluid
Author(s) -
Cho Min S.,
Choi Hyoung J.,
To Kiwing
Publication year - 1998
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/(sici)1521-3927(19980601)19:6<271::aid-marc271>3.0.co;2-o
Subject(s) - polyaniline , electrorheological fluid , rheology , dielectric , materials science , shear rate , ionic bonding , shear (geology) , copolymer , polymer chemistry , relaxation (psychology) , composite material , spectral line , chemical engineering , electric field , polymer , chemistry , organic chemistry , polymerization , ion , physics , quantum mechanics , engineering , social psychology , psychology , optoelectronics , astronomy
Particles of semiconducting polyaniline and a copolyaniline bearing ionic substituents were synthesized. Electrorheological (ER) fluids using these particles were compared with each other with respect to their rheological properties and dielectric spectra. In the steady shear rheological experiment conducted at 3 kV/mm (DC) at 25°C, the copolymer system showed higher stress than the polyaniline system in the whole shear rate region. This result was interpreted in terms of the conductivities of the particles and their dielectric spectra. Especially, the different behavior in the high shear rate region can be related to the electrical relaxation phenomena observed in the dielectric spectra.