How to obtain high dielectric constant using low filler content is one of the urgent problems to be solved in the research field of ceramic/polymer dielectric materials. In traditional methods (fillers are randomly distributed), filler particles are isolated by thick layers of polymers (with low dielectric constant), which usually result in ultra-low enhancement efficiencies of dielectric constant for the composites. To solve the above puzzle, this study provides a new strategy to improve the dielectric constant of ceramic/polymer composites, that is constructing 3D segregated architectures of BaTiO₃ (BT networks) in polystyrene (PS) matrix. This strategy is expected to enhance dielectric interaction between BT particles and greatly improve the dielectric constant of BT/PS composites. In this method, PS@BT core–shell microspheres were firstly fabricated by electrostatic self-assembling the BT particles on PS microspheres. BT/PS composites with BT networks were constructed by hot pressing above core–shell microspheres. Microstructures of PS@BT microspheres and BT/PS composites were investigated. Dielectric properties of BT/PS composites with various BT contents were studied. Results show that dielectric constant of the BT/PS composites is up to 41.8 when BT content is only 30vol%, which is much higher than that of traditional composites. This research provides us a facile method to design and fabricate ceramic/polymer composites with high dielectric constant and low loss.

中文翻译：

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通过热压核-壳聚苯乙烯@BaTiO 3复合微球制备的具有增强介电常数的3D隔离结构BaTiO 3 /聚苯乙烯复合材料

如何以低填充量获得高介电常数是陶瓷/高分子介电材料研究领域亟待解决的问题之一。在传统方法中（填料是随机分布的），填料颗粒被厚厚的聚合物层（介电常数低）隔离，这通常会导致复合材料的介电常数超低提高效率。为解决上述难题，本研究提供了一种改善陶瓷/聚合物复合材料介电常数的新策略，即构建BaTiO _3的3D隔离结构。（BT网络）在聚苯乙烯（PS）基质中。该策略有望增强BT颗粒之间的介电相互作用，并大大提高BT / PS复合材料的介电常数。用这种方法，首先通过在PS微球上静电自组装BT颗粒来制造PS @ BT核壳微球。具有BT网络的BT / PS复合材料是通过在核-壳微球上方热压而构建的。研究了PS @ BT微球和BT / PS复合材料的微观结构。研究了不同BT含量的BT / PS复合材料的介电性能。结果表明，当BT含量仅为30vol％时，BT / PS复合材料的介电常数最高为41.8，远高于传统复合材料。