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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- 作者：DongJin Woo ; Jungki Kim ; Moon-Ho Suh ; Hongying Zhou ; SonBinh T. Nguyen ; Suck-Hyun Lee and John M. Torkelson
- 关键词：Copolymers ; Controlled radical polymerization ; Electroheological flud
- 刊名：Polymer
- 出版年：2006
- 出版时间：3 May 2006
- 年：2006
- 卷：47
- 期：10
- 页码：3287-3291
- 全文大小：122 K
文摘
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.