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In this study, synthesis, characterization, and electrorheological (ER) properties of polyindene (Pin) and Pin/calcium carbonate (Pin/CaCO3) conducting composites were carried out by free radical polymerization. In the experiments, FeCl3 was used as oxidizing agent and the ratio of salt:monomer was 2:1. First, Pin was synthesized and obtained with 70% yield. Then, Pin/CaCO3 composites containing various amounts of Pin were prepared. Pin and Pin/CaCO3 composites were characterized by FTIR spectroscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), dynamic light scattering (DLS) methods, Gouy Balance, and dielectric measurements. Suspensions of Pin and Pin/CaCO3 composites were prepared in silicone oil (SO), at a series of concentrations (c = 10-25%, m/m) and their sedimentation stabilities were determined. The effects of dispersed particle concentration, particle size, shear rate, external electric field strength, frequency, and temperature onto ER activities of suspensions were investigated. POLYM. COMPOS., 30:583-590, 2009. (C) 2008 Society of Plastics Engineers |
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