전기 유변체로서의 폴리아닐린 현탁액의 유변학적 특성

이영실; 권무현; 박오옥

Korean Journal of Rheology, Vol.7, No.3, 203-210, December, 1995

Export Citation

전기 유변체로서의 폴리아닐린 현탁액의 유변학적 특성

Rheological Characteristics of Polyaniline Suspension as an Electrorheological Fluid

이영실, 권무현, 박오옥

초록

전기장 하에서 폴리아닐린/미네랄 오일 현탁액의 유변학적 특성에 관한 실험적인 연구를 큐엣셀 형태의 레오미터를 사용하여 수행하였다. 폴리아닐린 현탁액은 전기장을 가해 줄 때 점도가 크게 상승하는 현상을 보였고 부피 분율과 전기장의 3/2승에 비례하는 동적 항복응력을 나타내었다. 작은 변형 진폭의 동적 상태 실험을 통하여 저장계수와 손실계수를 변형진폭. 변형의 구동 주파수 및 전기장의 함수로 나타내었다. 저장계수는 전기장을 증가시킬 때 증가하나 손실계수(5 wt%)는 약한 전기장의 존성을 보였다. 낮은 응력을 가해 줄 때의 크립과 회복 곡선은 초기의 순간적인 변형 증가와 지연되는 변형 그리고 회복 불가능한 영구적 변형으로 구성되어진다. 탄성 한계 항복응력은 전기장의 세기가 증가함에 따라 증가하였다. 매우 작은 변형에서는 응력과 변형 사이의 선형적 관계를 보여 고체와 유사한 거동을 나타내었다.

The rheological characteristics of polyaniline suspension in the mineral oil subjected to an electric field were studied experimentally using a Couette cell type rheometer. The polyaniline suspension shows dramatic increase in the viscosity on the application of the electric field. The dynamic yield stress of polyaniline suspension is linearly increased with volume fraction and E^3/2. The storage shear modulus and loss modulus have been measured using small amplitude forced oscillatory dynamic test as functions of strain amplitude, driving frequency, and the applied field strength. The storage modulus of polyaniline suspension increased with increasing applied field strength, but the loss modulus of dilute(5 wt%) suspension was slightly dependent upon the electric field strength. At low imposed shear stress, the creep and recovery curve comprises instantaneous strain, retardation strain, and permanent strain. The permanent strain is due to the viscous flow. The elastic limit stress increased with increasing of the electric field strength. At very small strain, linear dependence between the stress and strain was obtained as for a solid body.

Keywords:Electrorheology;polyaniline suspension;viscoelasticity;creep and recovery

[References]

Winslow WM, J. Appl. Phys., 20, 1137 (1949)
Gamota DR, Filisko FE, J. Rheol., 35, 1411 (1991)
Block H, Kelly JP, Qin A, Watson T, Langmuir, 6, 6 (1990)
Lee YS, Park OO, Steady Shear and Viscoelastic Behaviors of Polyaniline Suspension as an Electrorheological Fluid. Nihon Reoroji Gakkaishi, in press (1996)
MacDiarmid AG, "Conjugate Polymers and Related Materials," Edited by W.R. Salaneck, I. Lundstrom, B. Banby, Oxford Univ. Press Inc., New York (1993)
Jordan TC, Show MT, McLeish TCB, J. Rheol., 36, 441 (1992)
Koyama K, Minagawa K, Yoshida T, Kuramoto N, Proceedings of the Fourth International Conference on Electrorheological Fluids, Edited by R. Tao, 100 (1994)
Shulman ZP, Korobko EV, Yanovskii YG, J. Non-Newton. Fluid Mech., 33, 181 (1989)
Ahn KH, Klingenberg DJ, J. Rheol., 38(3), 713 (1994)

[Referenced By]

[1] Winslow WM, J. Appl. Phys., 20, 1137 (1949)

[2] Gamota DR, Filisko FE, J. Rheol., 35, 1411 (1991)

[3] Block H, Kelly JP, Qin A, Watson T, Langmuir, 6, 6 (1990)

[4] Lee YS, Park OO, Steady Shear and Viscoelastic Behaviors of Polyaniline Suspension as an Electrorheological Fluid. Nihon Reoroji Gakkaishi, in press (1996)

[5] MacDiarmid AG, "Conjugate Polymers and Related Materials," Edited by W.R. Salaneck, I. Lundstrom, B. Banby, Oxford Univ. Press Inc., New York (1993)

[6] Jordan TC, Show MT, McLeish TCB, J. Rheol., 36, 441 (1992)

[7] Koyama K, Minagawa K, Yoshida T, Kuramoto N, Proceedings of the Fourth International Conference on Electrorheological Fluids, Edited by R. Tao, 100 (1994)

[8] Shulman ZP, Korobko EV, Yanovskii YG, J. Non-Newton. Fluid Mech., 33, 181 (1989)

[9] Ahn KH, Klingenberg DJ, J. Rheol., 38(3), 713 (1994)