Abstract
There have been many reports on electrorheological (ER)1–4 suspensions because of their remarkable ER effect. Besides these two-phase systems, some one-phase system or homogeneous ER fluids5–14, such as polymeric liquids, have been developed. The homogeneous ER fluids are free from the problems seen in suspensions due to dispersed particles, e.g., sedimentation, aggregation, friction, which reduce the ER effect. We have been studying ER effects in polymeric liquids to establish a model for understanding the mechanism of the ER effects in such homogeneous systems6,12–14. Among the homogeneous ER fluids, polymers with flexible side chain connected with polar mesogenic group have a large ER effect8, 9. At present, the mechanism of the ER effect in these liquid crystal polymers (LCP) has been interpreted as the inhibition of the slipping between mesogenic domains by the flexible chains connecting them under an electric field. Detailed rheological examinations are necessary for further understanding of the mechanism.
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References
W.M. Winslow, Induced fibration of suspensions, J. Appl. Phys., 20, 1137 (1949).
H. Block and J. P. Kelly, Electro-rheology, J. Phys. D: Appl. Phys., 21, 1661 (1988).
T.C. Jordan and M.T. Shaw, Electrorheology, IEEE Trans. Elect. Insul., 24, 849 (1989).
T.C. Halsey, Electrorheological fluids, Science, 258, 761 (1992).
T. Honda, T. Sasada and K. Kurosawa, Electro-viscous effect in the MBBA liquid crystal, Jpn. J. Appl. Phys., 17 (9), 1525 (1978).
K. Tanaka, A. Fujii and K. Koyama, Electro-rheology of poly(vinylidene fluoridetrifluoroethylene) solution, Polym. J., 24, 995 (1992).
M. Fukumasa, K. Yoshida, S. Ohkubo and A. Yoshizawa, Decrease in apparent viscosity in electric field found in chiral smectic liquid crystals, Ferroelectrics, 147, 395 (1993).
A. Inoue and S. Maniwa, EP 478,034A (1992).
S. Maniwa and A. Inoue, Electrorheological effect of liquid crystal polymers (2): Dependence on molecular structure of polymer, Polym. Prepr. Jpn., 42(4), 1591 (1993).
I.-K. Yang and A. D. Shine, Electrorheology of a nematic poly(n-hexyl isocyanate) solution, J. Rheol., 36(6), 1079 (1992).
K.-L. Tse and A. D. Shine, Electrorheology of poly(n-hexyl-L-glutamate), Polym. Prepr. (ACS), 35(2), 383 (1994).
H. Kimura, K. Minagawa and K. Koyama, Induced network structure in liquid crystalline polymer evidenced from electrorheological normal stress measurements, Polym. J., 26(12), 1402 (1994).
T. Uemura, K. Minagawa and K. Koyama, Novel electro-responsive property of polyether-polycarbamate solution, Chem. Lett., 1994, 1995 (1994).
T. Uemura, K. Minagawa and K. Koyama, Negative ER effect in polymeric liquids, Polym. Prepr. (ACS), 35(2), 360 (1994).
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© 1995 Springer Science+Business Media New York
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Minagawa, K., Kimura, H., Koyama, K. (1995). ER Effect on the Normal Stress and Induced Network Structure of Liquid Crystal Polymer. In: Havelka, K.O., Filisko, F.E. (eds) Progress in Electrorheology. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-1036-3_21
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DOI: https://doi.org/10.1007/978-1-4899-1036-3_21
Publisher Name: Springer, Boston, MA
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