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Styrene/4-hydroxystyrene random, block and gradient copolymers modified with an organic dye: Synthesis by controlled radical polymerization and characterization of electrorheological properties |
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| Authors: | DongJin Woo Jungki Kim Hongying Zhou Suck-Hyun Lee John M Torkelson |
| Affiliation: | a Department of Chemical and Biological Engineering and the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA b Department of Molecular Science and Technology, Ajou University, Suwon 443-749, South Korea c Department of Chemical Engineering, Ajou University, Suwon 443-749, South Korea d Department of Chemistry, Northwestern University, Evanston, IL 60208, USA e Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA |
| Abstract: | Styrene/4-hydroxystyrene block and gradient copolymers containing the organic dye Disperse Red 1 (S/HSDR) were synthesized using nitroxide-mediated controlled radical polymerization, and a random copolymer was made using conventional free radical polymerization. The three types of S/HSDR copolymer, with similar molecular weight and composition but different S/HSDR sequence distributions along each copolymer chain, were used as dispersed particles for a study of electrorheological (ER) suspensions. The characterization of each ER fluid as a function of controlled molecular structure in suspension showed different ER behaviors. In particular, the suspension of the S/HSDR gradient copolymer showed the greatest degree of enhancement in shear viscosity, by as much as a factor of 10, upon application of a 1700 kV/m electric field. |
| Keywords: | Copolymers Controlled radical polymerization Electroheological flud |
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