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Study on the properties of magnetorheological gel based on polyurethane

机译：聚氨酯磁流变凝胶的性能研究

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摘要

Magnetorheological gels (MRGs) known as a new kind of magnetorheological material are composite gels containing magnetic particles suspended in polymer gels. In this study, a category of MR polymer gels based on polyurethane (PU) were prepared. The microstructures of these MRGs were observed with a digital microscope. Their rheological properties under both steady shear and oscillation testing were characterized by using a MR rheometer. The viscosity of the PU MRG decreased with the increment of NCO/OH ratio and increased with the increment of the weight concentration of carbonyl iron particles, molecular mass of poly propylene glycol, and applied magnetic field. The storage modulus increased gradually with the increment of applied magnetic field and weight concentration of carbonyl iron particles. The PU MRG exhibits high static shear yield stress (60.8 kPa, at 573 mT) and dynamic shear yield stress (83.9 kPa, at 573 mT) and wide variation range (static shear yield stress: 6-62 kPa, dynamic shear yield stress: 15-85 kPa). These advantages indicate that PU MRG is able to satisfy wide applications. In addition, both static and dynamic shear yield stresses of the MRG samples increase with the increment of molar mass of polypropylene glycol.
机译：磁流变凝胶（MRG）是一种新型的磁流变材料，是一种复合凝胶，其中的磁性颗粒悬浮在聚合物凝胶中。在这项研究中，制备了一种基于聚氨酯（MR）的MR聚合物凝胶。用数字显微镜观察了这些MRG的微观结构。使用MR流变仪表征了其在稳态剪切和振荡测试下的流变性能。 PU MRG的粘度随NCO / OH比的增加而降低，随羰基铁颗粒的重量浓度，聚丙二醇的分子量和外加磁场的增加而增加。储能模量随着施加磁场的增加和羰基铁颗粒的重量浓度逐渐增加。 PU MRG表现出高静态剪切屈服应力（60.8 kPa，573 mT）和动态剪切屈服应力（83.9 kPa，573 mT）和宽泛的变化范围（静态剪切屈服应力：6-62 kPa，动态剪切屈服应力： 15-85 kPa）。这些优势表明PU MRG能够满足广泛的应用。此外，MRG样品的静态和动态剪切屈服应力都随聚丙二醇摩尔质量的增加而增加。

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