Enhancement in Magnetorheological Effect of Magnetorheological Elastomers by Surface Modification of Iron Particles

作     者：Wan-quan Jiang Jing-jing Yao Xing-long Gong Lin Chen 

作者机构：Department of Chemistry University of Science and Technology of China Hefei 230026 China CA5 Key Laboratory of Mechanical Behavior and Design of Materials Department of Mechanics andMechanical Engineering University of Science and Technology of China Hefei 230027 China 

出 版 物：《Chinese Journal of Chemical Physics》 (化学物理学报（英文）)

年 卷 期：2008年第21卷第1期

页      面：87-92页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：ACKNOWLEDGMENTS This work was supported by the Natioal Natural Science Foundation of China (No.10672154) and the Specialized Research Fund for the Doctoral Program of Higher Education (No.20050358010). The Scholarship BRJH funding of Chinese Academy of Sciences is also appreciated 

主　　题：Magnetorheological elastomers Shear modulus Surfactant Microstructure 

摘      要：In order to obtain magnetorheological （MR） elastomers with high magnetorheological effect, a family of anisotropic rubber-based MR elastomers was developed using a new form of chemical modification. Three different kinds of surfactants, i.e. anionic, nonionic and compound surfactants, were employed separately to modify iron particles. The MR effect was evaluated by measuring the dynamic shear modulus of MR elastomer with a magneto-combined dynamic mechanical analyzer. Results show that the relative MR effect can be up to 188% when the iron particles are modified with 15% Span 80. Besides the surface activity of Span 80, however, such high modifying effect is partly due to the plasticizing effect of Span 80. Compared with the single surfactant, the superior surface activity of compound surfactant makes the relative MR effect reach 77% at a low content of 0.4%. Scanning electron microscope observation shows that the modification of compound surfactant results in perfect compatibility between particles and rubber matrix and special self-assembled structure of particles. Such special structure has been proved beneficial to the improvement of the relative MR effect.