Magnetorheological (MR) foam, which is comprised of magnetic particles inside the matrix phase, is capable of changing its physical and rheological properties corresponding to the applied magnetic field. However, the performance of this material seems unsatisfactory due to the nonuniform distribution of magnetic particles throughout the composite area resulting in uneven magnetic properties. Since uniform magnetic properties are significant regarding MR foam, in situ fabrication using a polyvinyl chloride mould can be used to achieve the targetted improvement. MR foam was prepared with various amounts of carbonyl iron particles (CIPs), 0, 35, 45 and 55 wt%, and investigated at three different positions (top, middle and bottom parts) with a vibration sample magnetometer. The results showed that the hysteresis loop at all CIP concentrations of 35, 45 and 55 wt% exhibited superparamagnetic properties with magnetic saturation. The M s of the top, middle an...

中文翻译：

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羰基铁颗粒在磁流变聚氨酯泡沫中的高度均匀分散的微观和磁性响应之间的关系

磁流变（MR）泡沫由基质相内部的磁性颗粒组成，能够根据施加的磁场改变其物理和流变特性。但是，由于磁性颗粒在整个复合区域的分布不均匀，导致磁性能不均匀，因此该材料的性能似乎不能令人满意。由于对于MR泡沫而言，均匀的磁性非常重要，因此可以使用使用聚氯乙烯模具的原位制造来实现目标的改进。用0、35、45和55 wt％的各种羰基铁颗粒（CIP）制备MR泡沫，并用振动样品磁力计在三个不同的位置（顶部，中间和底部）进行研究。结果表明，在所有CIP浓度为35时，磁滞回线 45和55wt％表现出具有磁饱和的超顺磁性。顶部，中间和底部的M s