Electrorheology of conducting polyaniline composite particles

Hyoung Jin Choi, Min Sung Cho, Young Hoon Lee, Yun Hyang Cho, Myung S. Jhon
2004 E-Polymers  
AbstractThree different kinds of particles of semiconductive polyaniline (PANI), spherical poly(methyl methacrylate) with a PANI shell (PAPMMA), and conductive PANI encapsulated by insulating melamine-formaldehyde resin (MCPA) were synthesized and adopted as a dispersed phase for electrorheological (ER) fluids. ER fluids are suspensions of polarizable particles dispersed in non-conducting liquids. The rheological characteristics of ER fluids rapidly change in the presence of an applied electric
more » ... field, which can be controlled by both the applied electric field strength and particle concentration with a fast response time on the order of milliseconds. MCPA-based ER fluids show the largest stress enhancement by an applied electric field compared with both PANI- and PAPMMA-based ER fluids, demonstrating that the conductive core with an insulating shell system is a better ER material than homogeneous, semiconductive materials or surface-semiconductive materials with insulating cores.
doi:10.1515/epoly.2004.4.1.314 fatcat:e4j2fh2gtva2jjgzvpdafd5bve