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首页> 外文期刊>Journal of Applied Polymer Science >Dielectric properties and morphology of polymer composites filled with dispersed iron
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Dielectric properties and morphology of polymer composites filled with dispersed iron

机译：分散铁填充的聚合物复合材料的介电性能和形貌

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摘要

The dielectric properties and the structure of various metal-polymer composites, based on a polymer matrix of polyamide (PA), polyethylene (PE), polyoxymethylene (POM), or blend PE/POM filled with dispersed iron (Fe) particles, have been investigated in this work. In PE-Fe, PA-Fe, and POM-Fe composites the filler spatial distribution is random. In the PE/POM-Fe composites, the polymer matrix is two-phase and the filler particles are localized only in the POM phase, resulting in an ordered distribution of the dispersed filler particles within the blend. The concentration and frequency dependence of the dielectric permittivity, epsilon', and the dielectric loss tangent, tandelta, are described in terms of the percolation theory. The experimental values of the critical exponents (namely, s, r, and y) are in good agreement with those predicted by the theory for the composites with random filler distribution. The PE/POM-Fe composites demonstrate low value of the percolation threshold, P,, and high values of the critical exponents r and y. This is attributed to the specific structure of these composites. A schematic model for the morphology of the composites studied has been proposed. This model explains the peculiar behavior of the PE/POM-Fe composites by assuming ordered distribution of the filler particles in a binary polymer matrix. The proposed model is in good agreement with the results of optical microscopy. (C) 2003 Wiley Periodicals, Inc. [References: 41]
机译：基于聚酰胺（PA），聚乙烯（PE），聚甲醛（POM）或填充有分散的铁（Fe）颗粒的共混PE / POM的聚合物基体，各种金属-聚合物复合材料的介电性能和结构已得到证实在这项工作中进行了调查。在PE-Fe，PA-Fe和POM-Fe复合材料中，填料的空间分布是随机的。在PE / POM-Fe复合材料中，聚合物基质为两相，填料颗粒仅局限在POM相中，导致分散的填料颗粒在共混物中有序分布。介电常数ε的浓度和频率依赖性以及介电损耗角正切tandelta是根据渗流理论来描述的。临界指数（即s，r和y）的实验值与该理论预测的具有随机填料分布的复合材料的实验值非常吻合。 PE / POM-Fe复合材料的渗透阈值P低，而临界指数r和y高。这归因于这些复合材料的特定结构。已经提出了用于研究的复合材料的形态的示意性模型。该模型通过假设填料颗粒在二元聚合物基质中的有序分布来解释PE / POM-Fe复合材料的特殊行为。所提出的模型与光学显微镜的结果非常吻合。 （C）2003 Wiley Periodicals，Inc. [参考：41]

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