Du Fang-Yan, Chen Rui-Chao, Che Junjin, Xu Wei-Di, Liu Xiu, Li Yin-Tao, Zhou Yuan-Lin, Yuan Jinkai, Zhang Quan-Ping
State Key Laboratory of Environment-friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China.
Centre de Recherche Paul Pascal, CNRS, University of Bordeaux, UMR 5031, 33600, Pessac, France.
Phys Chem Chem Phys. 2021 Dec 1;23(46):26219-26226. doi: 10.1039/d1cp04040e.
Integrating high-loading dielectric nanoparticles into polar polymer matrices potentially can profit the intrinsic polarization of each phase and allow for greatly enhanced dielectric properties in polymer nanocomposites. It is however challenging to achieve desirable highly filled polar polymer composites because of the lack of efficient approaches to disperse nanoparticles and maintain interfacial compatibility. Here, we report a versatile route to fabricate highly filled barium titanate/fluorinated silicone rubber (BT/FSR) nanocomposites by "thiol-ene click" and isostatic pressing techniques. The loaded BT nanoparticles (from 82 wt% to 90 wt%) are chemically bonded with FSR in the nanocomposites. The existence of the polar group (-CHCF) of the polymer matrix does not affect the uniform dispersion of the nanoparticles or the good interfacial compatibility. The 90 wt% BT/FSR nanocomposite shows the highest dielectric constant of 57.8 at 10 Hz, while the loss tangent can be kept below 0.03. Besides, BT/FSR nanocomposites display higher breakdown strength than BT/SR nanocomposites. This work offers a facile strategy towards superior dielectric properties of polymer nanocomposites.
将高负载量的介电纳米颗粒整合到极性聚合物基体中，有可能有利于各相的固有极化，并使聚合物纳米复合材料的介电性能得到大幅增强。然而，由于缺乏有效的纳米颗粒分散方法和维持界面相容性的方法，制备理想的高填充极性聚合物复合材料具有挑战性。在此，我们报道了一种通过“硫醇-烯点击”和等静压技术制备高填充钛酸钡/氟化硅橡胶（BT/FSR）纳米复合材料的通用路线。负载的BT纳米颗粒（82 wt%至90 wt%）在纳米复合材料中与FSR发生化学键合。聚合物基体的极性基团（-CHCF）的存在并不影响纳米颗粒的均匀分散或良好的界面相容性。90 wt%的BT/FSR纳米复合材料在10 Hz时显示出最高介电常数57.8，而损耗角正切可保持在0.03以下。此外，BT/FSR纳米复合材料比BT/SR纳米复合材料表现出更高的击穿强度。这项工作为实现聚合物纳米复合材料优异的介电性能提供了一种简便策略。
