Nanocomposites comprising flexible polymers and high dielectric constant inorganic nanoparticles are considered to be one of the promising candidates for electrostatic capacitor dielectrics. However, the effect of interfacial property on electrical energy storage of dielectric polymer nanocomposites is still not clear. Herein, the role of the polarity of the interfacial region is investigated. For this purpose, three polymers with different polarity, polymethyl methacrylate (PMMA), polyglycidyl methacrylate, and polymethylsulfonyl ethyl methacrylate (PMSEMA) are attached onto BaTiO₃ (BT) nanoparticle surface via surface-initiated reversible addition-fragmentation chain transfer polymerization. It is found that the polarity of shell polymers shows an apparent effect on the dielectric and energy storage of dielectric polymer nanocomposites. For example, PMSEMA@BT (shell polymer possesses the highest polarity) increases dielectric loss and decreases the breakdown strength of the nanocomposites, leading to lower energy storage capability. However, PMMA@BT (shell polymer possesses the lowest polarity) can induce higher breakdown strength of the nanocomposites. As a result, the PMMA@BT nanocomposite exhibits the highest electrical energy storage capability among the three nanocomposites. This research provides new insight into the design of core-shell nanofillers for dielectric energy storage applications.

包含柔性聚合物和高介电常数无机纳米粒子的纳米复合材料被认为是静电电容器电介质的有希望的候选者之一。然而，界面性质对介电聚合物纳米复合材料电能存储的影响尚不清楚。在此，研究了界面区域的极性的作用。为了这个目的，三种聚合物具有不同的极性，聚甲基丙烯酸甲酯（PMMA），聚甲基丙烯酸酯，和polymethylsulfonyl甲基丙烯酸乙酯（PMSEMA）附着到的BaTiO ₃（BT）纳米颗粒表面经由表面引发的可逆加成断裂链转移聚合。结果表明，壳聚合物的极性对介电聚合物纳米复合材料的介电和储能有明显的影响。例如，PMSEMA@BT（壳聚合物具有最高极性）会增加介电损耗并降低纳米复合材料的击穿强度，导致储能能力降低。然而，PMMA@BT（壳聚合物具有最低的极性）可以使纳米复合材料具有更高的击穿强度。因此，PMMA@BT 纳米复合材料在三种纳米复合材料中表现出最高的电能存储能力。这项研究为介电储能应用的核壳纳米填料的设计提供了新的见解。