Abstract:
The electrorheological (ER) properties of styrene-isoprene-styrene triblock copolymers (SIS) films (D1114P (19%wt PS), D1164P (29%wt PS), and D1162P (44%wt PS) and the polymer blends between dedoped-polydiphenylamine (De_PDPA) and SIS with D1114P, were in investigated under oscillatory shear mode at frequency of 0.01-100 rad/s, at electric field strengths between 0 to 2 kV/mm in the temperature sweep. In both pure SIS systems, their storage moduli (G’) exhibit linear increases with temperature above 330 K at l rad/s in the absence of electric field; and they become higher with increasing electric field up to 1 kV/mm. The storage modulus response (ΔG’) of polymer blends linearly increases with increasing particle concentration above 5% vol and increasing electric field strengths. The sensitivity is reduced at the concentrations beyond 10 and 20% vol, at electric field of 1 and 2 kV/mm respectively, while the storage modulus at these electric fileds still dramatically increase. Temporal response experiments show that the increase in particle concentration reduces induction time (Ʈind) and increases the reduction time (Ʈred). The deflection distances of D1114P and D1164P increase in stepwise manners similar to those of the blend systems. D1162P system shows no deflection response. The blend systems show increases in the deflection response with increasing particle concentration up to 10% vol and decreases at a concentration beyond that.
