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Enhancement in Magnetorheological Effect of Magnetorheological Elastomers by Surface Modification of Iron Particles
?Wan-quan Jiang*,Jing-jing Yao ,Xing-long Gong,Lin Chen
1.Department of Chemistry, University of Science and Technology of China, Hefei 230026, China;2.CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Mechanics and Mechanical Engineering, University of Science and Technology of Chi
Abstract:
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.
Key words:  Magnetorheological elastomers, Shear modulus, Surfactant, Microstructure
FundProject:高等学校博士学科点专项科研基金
Enhancement in Magnetorheological Effect of Magnetorheological Elastomers by Surface Modification of Iron Particles
?江万权*1, 姚静静1, 龚兴龙2, 陈琳3
1.?中国科学技术大学化学系,合肥230026;2.中国科学院材料力学行为与设计国家重点实验室,中国科学技术大学近代力学系,合肥230027;3.?中国科学院材料力学行为与设计国家重点实验室,中国科学技术大学近代力学系,合肥230027
摘要:
为了研制具有高磁流变效应的磁流变弹性体,从新的化学修饰的角度制备了各向异性的橡胶基磁流变弹性体. 阴离子表面活性剂、非离子表面活性剂和复合表面活性剂等三种不同类型的表面活性剂分别用于修饰铁颗粒. 使用力磁耦合动态测试仪测量磁流变弹性体的动态剪切模量,并计算材料的磁流变效应. 测试结果表明,当Span 80的含量为15%时,材料的相对磁流变效应可达到188%,除了表面活性外,Span 80的增塑效应也有利于相对磁流变效应的增加. 当使用具有强表面活性的复合表面活性剂修饰铁颗粒时,用量只需0.4%,便可使相对
关键词:  磁流变弹性体,剪切模量,表明活性剂,微结构
DOI:10.1088/1674-0068/21/01/87-92
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