Polymer particles containing bithiazole group were synthesized with2
2-diamino-4
4-bithiazole and benzidine. The particles were characterized with FT-IR spectroscopy
thermogravi metric analysis and scanning electron microscopy. Electrorheological (ER) fluids were prepared by disperse the polymer into two different media of bromodiphenylmethane and silicone oil respecti vely. Rheological properties of the ER fluids were measured with a rotational rheometer. Effects of electric field strength
disperse phase concentration and different disperse medium on the ER fluids were measured and discussed. The results showed that ER behaviour was enhanced with an increase in the disperse phase concentration and in the electric field strength. ER behaviour with density match is better than that with density mismatch between disperse phase and disperse medium.