A few novel metal-polymer (polyurethane-iron (PU-Fe)) nanocomposites were fabricated. First, the polyurethane (PU) polymer is synthesized from the ethylene glycol and iso-phorone di-isocyanate (as monomers) keeping the NCO/OH ratio at 1.2. The metal-polymer nanocomposites(PU/Fe) with 30 wt% of high-purity filler (Fe) powder of nano size were added during the polymerization process of PU in the reaction vessel. The formation of polyurethane (PU) was ascertained by the FTIR investigation of the -NCO, -OH, -NH and -C=O stretching vibrations. The XRD and FTIR study on the PU/Fe confirmed the presence and good interaction between Fe(0) and PU. Study of the effect of temperature and frequency on electrical characteristics of the nanocomposites, such as dielectric constant, loss tangent (tan δ), electrical impedance/modulus, etc., of composites has provided interesting results. It has been observed that, iron nanoparticles have significant effect on the above electrical properties of the nanocomposites. The iron-polyurethane nanocomposites can be used as biomaterials, self-cleaning materials and shape memory, and smart materials. The dielectric relaxation of these composites was also studied as a function of frequency from 1 kHz to 5 MHz. Detailed results were presented and discussed in the present communication.

制备了几种新型的金属聚合物（聚氨酯-铁（PU-Fe））纳米复合材料。首先，由乙二醇和异佛尔酮二异氰酸酯（作为单体）合成聚氨酯（PU）聚合物，将NCO / OH之比保持在1.2。在反应容器中，在PU的聚合过程中，添加具有30 wt％的纳米级高纯度填料（Fe）粉末的金属聚合物纳米复合材料（PU / Fe）。通过FTIR研究-NCO，-OH，-NH和-C = O拉伸振动来确定聚氨酯（PU）的形成。对PU / Fe的XRD和FTIR研究证实了Fe（0）和PU之间的存在和良好的相互作用。研究温度和频率对纳米复合材料电特性的影响，例如介电常数，损耗角正切（tanδ），电阻抗/模量等，复合材料的研究提供了有趣的结果。已经观察到，铁纳米颗粒对纳米复合材料的上述电性能具有显着影响。铁-聚氨酯纳米复合材料可用作生物材料，自清洁材料和形状记忆以及智能材料。还研究了这些复合材料的介电弛豫随频率从1 kHz到5 MHz的变化。在本来文中介绍并讨论了详细的结果。还研究了这些复合材料的介电弛豫随频率从1 kHz到5 MHz的变化。在本来文中介绍并讨论了详细的结果。还研究了这些复合材料的介电弛豫随频率从1 kHz到5 MHz的变化。在本来文中介绍并讨论了详细的结果。