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以微米级Fe3O4粉末和聚乙烯醇(PVA)为原料,采用反复冷冻-融化技术(冻融)制备了Fe3O4/PVA磁性水凝胶,研究了磁性水凝胶的力学性能、磁场阈值,磁性能等随Fe3O4的含量及冻融次数的变化行为,并使用扫描电子显微镜(SEM)以及X射线衍射(XRD)分别研究了Fe3O4/PVA磁性水凝胶的微观形貌和结晶性能。结果表明随冻融循环次数的增加,Fe3O4/PVA磁性水凝胶的力学性能、磁场阈值,及磁性能等均随Fe3O4的含量及冻融次数显著变化;Fe3O4在磁性水凝胶中分布均匀,PVA水凝胶经反复冷冻-融化后结晶性能有所提高。
Fe3O4 / PVA magnetic hydrogel was prepared by repeated freeze-thaw technique using micron-sized Fe3O4 powder and polyvinyl alcohol (PVA) as raw materials. The mechanical properties, magnetic field threshold, magnetic properties With the content of Fe3O4 and the number of changes in the number of freeze-thaw cycles. The morphology and crystallinity of Fe3O4 / PVA hydrogels were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that the mechanical properties, magnetic field thresholds and magnetic properties of Fe3O4 / PVA hydrogel changed significantly with the content of Fe3O4 and the number of freeze-thaw cycles as the number of freeze-thaw cycles increased. Fe3O4 was uniformly distributed in the magnetic hydrogel, PVA hydrogel after repeated freeze-thaw crystallization improved.